spf band 345 feed package development specification · mtbm mean time between maintenance olm...

Document No.: Revision: Date:

SKA-TEL-DSH-0000085 1 2018-09-25

Author: Andy Born

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Name Designation Affiliation Signature & Date

Compiled by:

A. Born SPF345 Systems Engineer

UKATC

Approved by:

I.P. Theron SPF Lead Engineer

EMSS Antennas

T. Küsel SKADC SE SKA-SA

SPF BAND 345 FEED PACKAGE DEVELOPMENT SPECIFICATION

Document number ........................................................................ SKA-TEL-DSH-0000085 Revision ........................................................................................................................... 1 Author ............................................................................................................... Andy Born Date ................................................................................................................ 2018-09-25 Status .................................................................................................................. Released

PPAngela Taylor (Sep 27, 2018)

Isak Theron (Sep 27, 2018)Isak Theron

https://na1.documents.adobe.com/verifier?tx=CBJCHBCAABAA8aje5UhI93FsQv2XrvFkfz111zmPkQd4




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DOCUMENT HISTORY

Revision Date of Issue

(YYYY-MM-DD)

Engineering

Change

Number

Comments

A 2017-05-15 - First draft released for internal review by SPF Band 345 team (Oxford), EMSS and Dish Consortium – incorporates provisional requirements covering split of Band 5 as per ECP160022.

B 2017-07-21 -

Updated to harmonise with latest revision (rev. 5) of Single Pixel Feed (SPF) Requirements Specification SKA-TEL-DSH-0000012; Added further requirements for Configuration, Control, Monitoring and Remote Support; Rationalised the SPF345 requirements numbering to follow the conventions of SPF-level documents.

C 2017-10-25 - Section 3.1.1.3, req. R.SPF345.P.27 - update of RFI survival levels as proposed by AP-H e-mail of 2017-06-30 [close-out of PDR OAR #15 against "SPF Compliance Matrix" SKA-TEL-DSH-0000072 rev.B].

D 2018-01-22 - Draft prepared for delta-PDR. Updated to latest versions of the interfaces.

E, F, G, H

2018-02-02 2018-06-14 2018-07-11 2018-09-15

-

Rationalisation of section 3.5.1 (Reliability, Availability and Maintainability). Updated to latest versions of the SPF design and interfaces. Removed requirements not allocated to band 5. Added the test definitions to section 4.2.

1 2018-09-25 - First release version.

DOCUMENT SOFTWARE Package Version Filename

Word processor MS Word Word 2016 SKA-TEL-DSH-0000085_Rev1_SPFB345DevelopmentSpecification.docx

Block diagrams

Other

ORGANISATION DETAILS Name SKA Organisation

Registered Address Jodrell Bank Observatory

Lower Withington, Macclesfield, Cheshire

SK11 9DL

United Kingdom

Registered in England & Wales

Company Number: 07881918

Fax. +44 (0)161 306 9600

Website www.skatelescope.org


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TABLE OF CONTENTS

1 SCOPE ...................................................................................................... 8

1.1 Identification ......................................................................................................................... 8

1.2 Intended Use of this Document ............................................................................................ 8

1.3 System Description ............................................................................................................... 8

1.3.1 System Overview ........................................................................................................... 8

1.3.2 System Components ..................................................................................................... 8

1.3.3 Context and Product Breakdown Structure................................................................... 9

2 DOCUMENTS ........................................................................................... 11

2.1 Applicable Documents ........................................................................................................ 11

2.2 Reference Documents ......................................................................................................... 11

3 REQUIREMENTS ........................................................................................ 12

3.1 Functional and Performance Requirements........................................................................ 12

3.1.1 Capability Requirements ............................................................................................. 12

3.1.1.1 Illuminate Optics ..................................................................................................... 12

3.1.1.2 Convert EM to RF .................................................................................................... 14

3.1.1.3 Amplify RF Signals ................................................................................................... 14

3.1.1.4 Add Calibration Signal ............................................................................................. 15

3.1.1.5 Configure ................................................................................................................. 16

3.2 Interface Requirements ...................................................................................................... 16

3.2.1 SPF Band 345 External Interfaces Identification .......................................................... 16

3.2.2 SPF Band 345 External Interface Requirements .......................................................... 18

3.2.2.1 SPF Band 345 EM Interface ..................................................................................... 18

3.2.2.2 [I.M.DS_SPF.03] Dish Structure – SPF BAND 345 Power Interface .......................... 18

3.2.2.3 [I.M.DS_SPF.09] Dish Structure – SPF BAND 345 Mechanical Interface .................. 18

3.2.2.4 [I.M.RX_SPF.03], [I.M.RX_SPF.07], [I.M.RX_SPF.08] and [I.M.RX_SPF.09] SPF Receivers – SPF BAND 345 RF Interface .................................................................................. 18

3.2.2.5 [I.M.RX_SPF.06] SPF Receivers MID – SPF BAND 345 Noise Diode Interface ........... 19

3.2.2.6 [I.M.DI_SPF.04] Dish Fibre Network – SPF BAND 345 Fibre Connector Interface .... 19

3.2.2.7 [SPF.IIF.03] SPF Controller – SPF BAND 345 Control and Data Interface ................. 19

3.2.2.8 [SPF.IIF.11] SPF Helium – SPF BAND 345 Helium Interface ...................................... 19

3.2.2.9 [SPF.IIF.08] SPF Vacuum– SPF BAND 345 Vacuum Interface ................................... 19

3.3 Environmental ..................................................................................................................... 20

3.3.1 Operational ................................................................................................................. 20


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3.3.2 Radio Frequency Interference ..................................................................................... 21

3.3.3 Configuration, Control, Monitoring and Remote Support ........................................... 22

3.3.4 Transportation ............................................................................................................ 22

3.3.5 Storage ........................................................................................................................ 22

3.4 Human Factors .................................................................................................................... 23

3.5 Integrated Logistics Support ............................................................................................... 23

3.5.1 Reliability, Availability and Maintainability ................................................................. 23

3.5.2 Repair and Replacement ............................................................................................. 23

3.5.3 Product Marking .......................................................................................................... 24

3.5.4 ILS Publication ............................................................................................................. 25

3.5.4.1 Manufacturing Data Packs ...................................................................................... 25

3.5.4.2 Support Publications ............................................................................................... 25

3.5.5 Training ....................................................................................................................... 25

3.5.6 Supply Support ............................................................................................................ 25

3.5.7 Packaging Handling and Transportation ...................................................................... 25

3.5.8 Equipment ................................................................................................................... 26

3.5.9 Facilities ...................................................................................................................... 26

3.6 Product Assurance .............................................................................................................. 27

3.6.1 Standardisation ........................................................................................................... 27

3.6.2 Workmanship .............................................................................................................. 27

3.6.3 Safety and Security ...................................................................................................... 27

3.6.4 Design Methods .......................................................................................................... 27

3.7 Design Constraints .............................................................................................................. 27

3.8 Precedence and Criticality of Requirements ....................................................................... 28

4 VERIFICATION .......................................................................................... 29

4.1 Verification Definitions ....................................................................................................... 29

4.2 Requirements Verification Matrix ....................................................................................... 30

5 PACKAGING ............................................................................................. 45

6 NOTES ................................................................................................... 45

6.1 Explanatory Notes ............................................................................................................... 45

6.2 List of Unresolved Issues ..................................................................................................... 45


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LIST OF FIGURES

Figure 1: SPF Band 345 Feed Package in the SPF Product Breakdown Structure. ................................. 9

Figure 2: SPF Band 345 Feed Package Context Diagram. .................................................................... 10

Figure 3: SPF Band 345 Feed Package External Interface Diagram ..................................................... 17

LIST OF TABLES

Table 1: External Interface Identification ............................................................................................ 18

Table 2: Verification Methods Applicable to the System .................................................................... 29

Table 3: Test Classes Applicable to the System ................................................................................... 29

Table 4: Verification Cross Reference Matrix ...................................................................................... 30


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LIST OF ABBREVIATIONS

COTS Commercial off-the-shelf

DS Dish structure

EM Electromagnetic

EMC Electromagnetic compatibility

EMI Electromagnetic interference

ESD Electrostatic discharge

FPC Feed package controller

FPGA Field programmable gate array

ILM Intermediate level maintenance

ILS Integrated logistic support

IXR Intrinsic cross polarisation

LMC Local monitoring and control

LNA Low noise amplifier

LPZ Lightning protection zone

LRU Line replaceable unit

LSA Logistic support analysis

MMDT Mean maintenance down-time

MTBM Mean time between maintenance

OLM Organisational level maintenance

OMT Orthogonal mode transducer

RBW Resolution bandwidth

RF Radio frequency

RFI Radio frequency interference

RMS Root mean square

SKA Square kilometre array

SPF Single pixel feed

SPFC Single pixel feed controller

SRU Shop replaceable unit

TBC To be confirmed

TBD To be determined


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GLOSSARY

Specification terminology:

May The word “may” in the text expresses a permissible practice or action. It does not

express a requirement of the specification.

Must The word “must” in the text is used for legislative or regulatory requirements (e.g.

Health and Safety) with which both the Purchaser and Vendor shall comply. It is not

used to express a requirement of the specification.

Shall The word “shall” in the text expresses a mandatory requirement of the specification.

Departure from such a requirement is not permissible without formal agreement

between the Vendor and the Purchaser.

Should The word “should” in the text expresses a recommendation or advice on implementing

such a requirement of the specification. The Purchaser expects such recommendations

or advice to be followed unless good reasons are stated for not doing so.

Will The word “will” in the text expresses a provision or service by the Purchaser or an

intention by the purchaser in connection with the requirement of the specification. The

Vendor is implicitly authorised to rely on such service or intention.

For items written in Bold Italic, see the Glossary in [AD1].


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1 SCOPE

1.1 Identification

This specification establishes the performance, design, development and test requirements for the Single Pixel Feed Band 345 Feed Package, item number 317-030000 that forms part of the SPF Sub-element of the SKA MID Dishes.

It refines the relevant higher level requirements from [AD1], as allocated in [AD2].

1.2 Intended Use of this Document

The intended audience for this document is:

a. SKA Dish Consortium System Engineering personnel involved with the establishment and approval of this development specification.

b. Engineering personnel involved in the development of the SPF Band 345 Feed Package.

1.3 System Description

1.3.1 System Overview

The Single Pixel Feed (SPF) Band 345 Feed Package collects both orthogonal components of the electromagnetic (EM) radiation concentrated at the focus of the reflector system and transforms them into electrical signals. The Band 345 Feed Package covers the 1.65 GHz to 15.4 GHz frequency range in 4 bands. For performance reasons coverage of Band 5 (originally 4.6 to 13.8 GHz) has been split into two sub-bands 5a and 5b (4.6-8.5 GHz and 8.3-15.4 GHz respectively) in accordance with ECP-160022. The cryostat is designed to house Bands 3 and 4 in separate side-pods which will be added in the future. The SPF Band 345 Feed Package includes cooling / thermal stabilisation to achieve the specified low noise amplifier (LNA) noise performance and stability of the injected calibration noise. The Feed Package is covered by a protective weather shield (the Environmental Shield) and mounted to the indexer via a mounting frame.

The Gifford McMahon cryogenic-cooler employed requires high pressure helium supply and return to function. The helium will be supplied by the SPF helium service. The cryogenic components inside the cryostat are thermally insulated by high vacuum. A scroll vacuum pump will be installed on each dish to provide the SPF vacuum service.

The Feed Package will be controlled by the Feed Package Controller (FPC) which will communicate with the SPF Controller (SPFC) using a slow serial communication over fibre connection.

1.3.2 System Components

The SPF Band 345 has three major components that are deliverable and Line Replaceable Units (LRU) as follows:

• Band 345 Mounting Mechanics This component facilitates the accurate mounting of the Band 345 Cryostat Package to the Dish Indexer.


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• Band 345 Cryostat Package The cryostat part of this assembly houses the cooled parts of the signal chain. This includes the Feed Horns, Ortho-mode Transducers (OMTs) and LNAs. The two output signals connect to the Receiver. The control part contains the power supply module and is responsible for all the control and monitoring interaction with the SPFC.

• Environmental Shield The Environmental Shield protects the Band 345 Cryostat Package from direct sunlight and rain. It is not designed to provide total shielding from the environment.

For design purposes documents are grouped according to the following major functions and utilises the applicable SPF Band 345 major components in order to meet this function:

• Signal Path Functional Group (Mounting, Horn Assembly, OMTs and RF path)

• Cryogenic Functional Group

• Control Functional Group

Allocations of the SPF Band 345 requirements to the appropriate functional group is done in the SPF Band 345 Design Document. By implication the requirements are allocated to the components that form part of each of the four LRUs. Noteworthy is that a function such as the Signal Path extends through multiple major components i.e. Horn Assembly and OMT Waveguide Assembly converts the EM signals to an electrical RF signal.

1.3.3 Context and Product Breakdown Structure

The physical hierarchy diagram of the next higher level assembly of the SPF Band 345 Feed Package is shown in Figure 1.

Figure 1: SPF Band 345 Feed Package in the SPF Product Breakdown Structure.

The functional context diagram of the next higher level assembly of the SPF Band 345 Feed Package is given in Figure 2 below.


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SPF

Band 345 Feed Package(SPF345)

Figure 2: SPF Band 345 Feed Package Context Diagram.


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2 DOCUMENTS

2.1 Applicable Documents

The following documents are applicable to the extent stated herein. In the event of conflict between the contents of the applicable documents and this document, the applicable documents shall take precedence.

[AD1] A. Peens-Hough, et. al., “Single Pixel Feed (SPF) Requirements Specification”, SKA-TEL-DSH-0000012, Rev. 5, 2017-06-01.

[AD2] I. P. Theron, el al., Single Pixel Feed (SPF) Sub-element Design Document, SKA-TEL-DSH-0000020, Rev. 6, 2018-07-17.

[AD3] G. Smit, “SKA1 Dishes Element Power Budget”, SKA-TEL-DSH-0000041, Rev. 2, 2017-03-03.

SPF External ICDs:

[AD4] H. Niehaus, “Physical Interface Control Document Between SPF Band 345 Package and Dish Structure”, SKA-TEL-DSH-0000060, Rev. 1, 2017-03-08.

[AD5] “SPF 345 Physical Interface Drawing”, 301-000000-020, Rev. 1, 2017-03-07.

[AD6] G. Smit, “RF and Noise Diode Control Signal Interface between the Single Pixel Feed Receiver and the Single Pixel Feeds”, SKA-TEL-DSH-0000065, Rev. 2, 2018-06-11.

[AD7] G. Smit, “Physical Interface Control Document between the Dish Fibre Network and the Single Pixel Feeds”, SKA-TEL-DSH-0000066, Rev. 4, 2018-07-03.

SPF Band 345 External ICDs

[AD8] P.C. van Niekerk, “SPF Controller to SPF Band 345 Data Exchange ICD”, SKA-TEL-DSH-0000095, Rev. 1, 2018-09-05.

[AD9] A. Krebs, “SPF Band 345 to SPF Vacuum Service Interface Control Document”, SKA-TEL-DSH-0000100, Rev. 1, 2016-11-30.

[AD10] A. Krebs, “SPF Band 345 to SPF Helium Service Interface Control Document”, SKA-TEL-DSH-0000103 Rev. 1, 2018-09-05.

Qualification

[AD11] I.P. Theron, et al., “SPF Sub-element Qualification Plan”, SKA-TEL-DSH-0000117, Rev. 2, 2017-09-08.

2.2 Reference Documents

The following documents are referenced in this document. In the event of conflict between the contents of the referenced documents and this document, this document shall take precedence.

(N/A)


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3 REQUIREMENTS

3.1 Functional and Performance Requirements

In this section, all the functional and performance requirements of the SPF Band 345 Feed Package – derived from [AD1] as allocated in [AD2] – are specified in the following format:

Requirement Identifier

The text of the requirement as it applies to SPF Band 345 Feed Package (“SPF Band 345”).

The SPF-level requirement

Requirements referring to “Band 345” should be taken to apply across all sub-bands. Requirements referring to “Band 5” should be taken to apply across both sub-bands 5a and 5b.

3.1.1 Capability Requirements

The following primary functions shall be implemented by the SPF Band 345:

• Intercepting the EM fields focussed by the reflector system to achieve the specified beam performance.

• Converting the electromagnetic signal to an RF signal and amplify it to the level required by the receiver while adding as little noise as possible.

• Adding a switched calibration signal to the appropriate band.

• Reporting the SPF Band 345 monitoring data to the SPFC.

• Managing the control and monitoring interface between the Feed Package and the SPFC.

• Providing the functional capabilities to enable remote support of the SPF Band 345 Feed Package.

3.1.1.1 Illuminate Optics

R.SPF345.P.1 Under Precision and Standard Operating Conditions, the Single Pixel Feed shall achieve Feed sensitivity (averaged) of at least 7.1 m2/K in both polarisations over SPF Band 3.

R.SPF.P.1.3

R.SPF345.P.2 Under Precision and Standard Operating Conditions, the Single Pixel Feeds shall achieve Feed sensitivity (averaged) of at least 6.6 m2/K in both polarisation channels over SPF Band 4.

R.SPF.P.1.4

R.SPF345.P.3 Under Precision and Standard Operating Conditions, the Single Pixel Feeds shall achieve Feed sensitivity (averaged) of at least 8.86 m2/K in both polarization channels over SPF Band 5a.

R.SPF.P.1.5

R.SPF345.P.4 Under Precision and Standard Operating Conditions, the Single Pixel Feeds shall achieve Feed sensitivity (averaged) of at least 6.74 m2/K in both polarization channels over SPF Band 5b.

R.SPF.P.1.6

R.SPF345.P.5 The Feed Sensitivity shall not be less than 80% for SPF band 3 compared to that which is specified in R.SPF345.P.1, at any pointing angle over the full accessible elevation range, under Precision and Standard Operating Conditions, and when calculated as an average over any 1 MHz interval over the specified frequency range in both polarisation channels.

R.SPF.P.2.3


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R.SPF345.P.6 The Feed Sensitivity shall not be less than 80% for SPF band 4 compared to that which is specified in R.SPF345.P.2, at any pointing angle over the full accessible elevation range, under Precision and Standard Operating Conditions, and when calculated as an average over any 1 MHz interval over the specified frequency range in both polarisation channels.

R.SPF.P.2.4

R.SPF345.P.7 The Feed Sensitivity shall not be less than 80% for SPF band 5a compared to that which is specified in R.SPF345.P.3, at any pointing angle over the elevation range from zenith down to 30° above the horizon, under Precision and Standard Operating Conditions, and when calculated as an average over any 1 MHz interval over the specified frequency range in both polarisation channels.

R.SPF.P.2.5

R.SPF345.P.8 The Feed Sensitivity shall not be less than 75% for SPF band 5b compared to that which is specified in R.SPF345.P.4, at any pointing angle over the elevation range from zenith down to 30° above the horizon, under Precision and Standard Operating Conditions, and when calculated as an average over any 1 MHz interval over the specified frequency range in both polarisation channels.

R.SPF.P.2.6

R.SPF345.P.9 Assuming perfect reflectors but including the pattern-deforming effect of feed mount tolerances over all bands and the full elevation range and under Precision and Standard Operating Conditions, the on-diagonal Mueller Matrix Patterns shall not vary by more than 3% relative to the peak gain for any rotation around bore sight of up to 5°, down to the -20 dB contour.

R.SPF.P.7

R.SPF345.P.10 For SPF Band 345 the total solid angle of sidelobes exceeding 0 dBi and further than either the eighth null or 10° from boresight, whichever is the greatest, assuming ideal reflectors, shall be less than 0.05 sr in any polarisation, over the entire frequency range in each band.

Note: There are no specific constraints on the levels of sidelobes within 10° from boresight.

R.SPF.P.11

R.SPF345.P.11 For SPF B345 the peak level of sidelobes beyond either the eighth null or 10° from boresight, whichever is the greatest, assuming ideal reflectors, shall not exceed 6 dBi in any polarisation, over the entire frequency range in each band.


R.SPF.P.12

R.SPF345.P.12 Under wind loads associated with Degraded Operating Conditions and with a maximum temperature gradient of 8°C across any dimension, the position of the SPF phase reference point, relative to the feed indexer, shall be maintained so that the contribution to the pointing error that cannot be corrected with a static pointing model does not exceed 1.75 arcsec.

R.SPF.P.13


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R.SPF345.P.13 Under wind loads associated with Precision and Standard Operating Conditions and with a maximum temperature gradient of 8°C across any dimension, the position of the SPF phase reference point, relative to the feed indexer, shall be maintained so that the contribution to the pointing error that cannot be corrected with a static pointing model does not exceed 0.9 arcsec.

R.SPF.P.21

R.SPF345.P.14 The IXR for each SPF band shall be at least 15 dB within the -3 dB contour, at any frequency over the whole observing bandwidth.

R.SPF.P.24

R.SPF345.P.31 The SPF Feed Packages shall receive dual linear polarisation, with vertical polarisation in the dish symmetry plane ±5° and horizontal polarisation parallel to the horizon ±5°.

R.SPF.P.xx1

3.1.1.2 Convert EM to RF

R.SPF345.P.15 The SPF Band 3 feed shall meet all requirements over a frequency range from 1.65 to 3.05 GHz for both polarisations simultaneously.

R.SPF.P.20.3

R.SPF345.P.16 The SPF Band 4 feed shall meet all requirements over a frequency range from 2.80 to 5.18 GHz for both polarisations simultaneously.

R.SPF.P.20.4

R.SPF345.P.17 The SPF Band 5a feed shall meet all requirements over a frequency range from 4.6 to 8.5 GHz for both polarisations simultaneously.

R.SPF.P.20.5

R.SPF345.P.18 The SPF Band 5b feed shall meet all requirements over a frequency range from 8.3 to 15.4 GHz for both polarisations simultaneously.

R.SPF.P.20.6

R.SPF345.P.19 The following design practices shall be employed to limit moisture collection in the signal path of SPF Band 345:

• Use of hydrophobic radome material, where applicable.

• Elimination of traps or crevices susceptible to moisture collection.

R.SPF.P.23

3.1.1.3 Amplify RF Signals

R.SPF345.P.20 The magnitude of the SPF output spectrum, measured at the Feed Package output ports with the feed on the dish terminated in Cold sky, shall not vary by more than the following, at a given elevation angle, across the specified frequency range: 1) Band 3 <= 4 dBp-p 2) Band 4 <= 4 dBp-p 3) Band 5a <= 2 dBp-p across any 2.5 GHz interval 4) Band 5b <= 2 dBp-p across any 2.5 GHz interval

R.SPF.P.3

R.SPF345.P.21 The SPF Band 345 Feed Package outputs shall have return loss of 16 dB or better, based on a 50 Ohm characteristic impedance across the specified frequency ranges.

R.SPF.P.4

1 This is a placeholder for this requirement, currently only defined in [AD2], but which will be added to the next version of [AD1] when it will be allocated the correct requirement number.


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R.SPF345.P.22 The SPF feed element shall amplify a signal with a nominally flat power spectral density at the LNA input of -188 dBm/Hz, with a nominal (band-averaged) gain of: 1) Band 3: 56±3 dB 2) Band 4: 56±3 dB 3) Band 5a: 56±3 dB 4) Band 5b: 56±3 dB

R.SPF.P.5

R.SPF345.P.23 The SPF feed element shall have 3rd order intercept points, referred to the input, of: 1) Band 3 >= -43 dBm 2) Band 4 >= -43 dBm 3) Band 5a >= -43 dBm 4) Band 5b >= -43 dBm

R.SPF.P.6

R.SPF345.P.24 The SPF, under Operational Conditions, measured between the Feed Package input and output ports, shall have a wide band gain stability over 5 s, when averaged over the central 500 MHz of the band and sampled with 20 ms intervals, of <= 0.08% RMS.

R.SPF.P.8

R.SPF345.P.25 The SPFs, under Operational Conditions (including orientation changes), measured between the Feed Package input and output ports, shall have a phase stability of <= 1° peak to peak over 5 minutes when sampled with 5 s intervals.

R.SPF.P.9

R.SPF345.P.26 SPF Phase stability RMS The SPFs, under Operational Conditions (including orientation changes), measured between the Feed Package input and output ports, shall have a phase stability of <= 0.5° RMS over 5 minutes, after subtracting a linear fit through the data points of the 5 minutes, when sampled with 5 s intervals.

R.SPF.P.10

R.SPF345.P.27 The SPF Band 3 - 5 RF chains shall survive the following input signals at the input of each LNA with no permanent degradation to performance:

• -6 dBm applied for 10 sec. max.

• +5 dBm applied for 1 sec. max.

• +32 dBm pulsed for 2 µsec out of 250 µsec. [goal].

R.SPF.P.19.3

R.SPF345.P.28 The SPF Band 345 Saturated output power shall not exceed 14 dBm. R.SPF.P.22

3.1.1.4 Add Calibration Signal

R.SPF345.CIC.1 The SPF Band 345 shall inject a switchable, wideband calibration signal into both polarisation channels (i.e. one signal into both channels), at the earliest possible point preceding the LNA.

R.SPF.CIC.4

R.SPF345.CIC.3 The power spectral density of the switchable calibration signal shall be equivalent to 5 - 13% of Tsys (range inclusive), averaged over any 1 MHz bandwidth across the specified frequency range and with Tsys computed for Cold sky at the lowest specified elevation angle.

R.SPF.CIC.3


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R.SPF345.CIC.4 Under Operational Conditions the standard deviation of the power of the calibration signal, referenced to the input of the LNA with samples integrated over 500 MHz and 500 ms, shall not exceed 0.04% over any 30 minute interval.

R.SPF.P.16

R.SPF345.CIC.5 Under Operational Conditions the phase difference with which the calibration noise signal is injected into the two RF signal paths shall remain stable to < 0.3° RMS, over the specified frequency range for each band.

R.SPF.P.17

R.SPF345.CIC.6 The sum of the switch ON and switch OFF times of the calibration signal (measured from the edge of the applied switching signal till the calibration signal reaches 50% of its final value) shall not exceed 30 microsec, with jitter not exceeding 70 ns RMS.

R.SPF.P.18

3.1.1.5 Configure

R.SPF345.P.29 The SPF Band 345 shall measure and report the time required to return to full performance after running stable and then being completely “off” for 10 minutes.

R.SPF.P.14

R.SPF345.P.30 The SPF Band 345 shall utilise a cold head with Helium consumption not exceeding that of the Oxford CryoSystems CoolStar 6/30, reducing below this level during stable operation.

R.SPF.P.15

3.2 Interface Requirements

3.2.1 SPF Band 345 External Interfaces Identification

The interfaces between the SPF Band 345 Feed Package and other Dish element Sub-elements are derived from [AD1] and the interfaces with other SPF sub-element major components can be determined from the context given in 345 above. The identified external interfaces of the SPF Band 345 to dish sub-elements, and other are show in Figure 3 below and listed in Table 1.


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SPF Band 345(Major Components)

Indexer

EnvironmentalShield

Mounting Mechanics

B5

a R

F (I

.M.R

X_S

PF.

08

)

B4

RF

(I.M

.RX

_SP

F.0

7)

B3

RF

(I.M

.RX

_SP

F.0

3)

Cryostat and Control Assembly

Horn Assembly B3

SPF

Vac

uu

m(S

PF

IIF0

8)

SPF

Hel

ium

Su

pp

ly a

nd

Ret

urn

(SP

F II

F11

)

B3OMT&

CouplerAssy

B3LNAs

B3 Cal.Noise Source

B3

2nd

Stage Amplification

GM Cold Head

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Horn

Radome

Dessicator

Horn Assembly B4

Horn

Radome

Dessicator

B5a Horn

Feed Package Controller (FPC) Assembly

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B4LNAs

B4 Cal.Noise Source

B4

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B5aCoupler

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B5a

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B5b Horn

Figure 3: SPF Band 345 Feed Package External Interface Diagram


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Table 1: External Interface Identification

3.2.2 SPF Band 345 External Interface Requirements

3.2.2.1 SPF Band 345 EM Interface

R.SPF345.I.1 The SPF Band 345 shall have an EM interface to the Dish Structure (Implicit)

3.2.2.2 [I.M.DS_SPF.03] Dish Structure – SPF BAND 345 Power Interface

R.SPF345.I.2 The SPF Band 345 power and ground connections shall have the interconnection characteristics as defined in [AD4] section "Interconnections" (DS-SPFB345).

R.SPF.I.3

R.SPF345.PW.1 The SPF Band 345 shall perform according to its requirements, as defined in this document, when supplied with the electrical power with the characteristics as defined in section "Single Phase UPS Power Characteristics" of [AD3].

R.SPF.PW.2

3.2.2.3 [I.M.DS_SPF.09] Dish Structure – SPF BAND 345 Mechanical Interface

R.SPF345.I.3 The SPF Band 345 components mounted to DS shall have the mechanical characteristics as defined in [AD4] section "Mechanical" (DS-SPFB345).

R.SPF.I.2

3.2.2.4 [I.M.RX_SPF.03], [I.M.RX_SPF.07], [I.M.RX_SPF.08] and [I.M.RX_SPF.09] SPF Receivers – SPF BAND 345 RF Interface

R.SPF345.I.4 The SPF Band 345 RF connections shall have the interconnection characteristics as defined in [AD6].

R.SPF.I.5

Interface Number

External To

Interface Type Component A Component B Ref

I.M.RX_SPF.03 SPF RF cable SPF345 SPF Receiver [AD6]




I.M.RX_SPF.06 SPF Fibre, Noise control. SPF Receiver SPF345 [AD6]

I.M.DS_SPF.03 SPF Power SPF345 Dish Structure [AD4]

I.M.DS_SPF.09 SPF Mechanical SPF345 Dish Structure [AD4], [AD5]

I.M.DI_SPF.04 SPF Fibre SPF Dish Fibre Network [AD7]

SPF IIF03 SPF345 Fibre Asynchronous serial

SPF345 SPFC [AD7], [AD8]

SPF IIF08 SPF345 Vacuum SPF345 SPFVac [AD9]

SPF IIF11 SPF345 Helium SPF345 SPFHe [AD10]


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3.2.2.5 [I.M.RX_SPF.06] SPF Receivers MID – SPF BAND 345 Noise Diode Interface

R.SPF345.I.5 The SPF Band 345 shall receive noise diode control signals from the SPFRx with the physical characteristics as defined in [AD6].

R.SPF.I.4

R.SPF345.I.6 The SPF Band 345 shall implement noise diode control signals from the SPFRx with the logical characteristics as defined in [AD6].

R.SPF.I.6

3.2.2.6 [I.M.DI_SPF.04] Dish Fibre Network – SPF BAND 345 Fibre Connector Interface

R.SPF345.I.7 The SPF Band 345 fibre connections shall have the interconnection characteristics as defined in [AD7].

R.SPF.I.1

3.2.2.7 [SPF.IIF.03] SPF Controller – SPF BAND 345 Control and Data Interface

R.SPF345.I.8 The SPF Band 345 shall provide a control and data interface to the SPF Controller, as described in [AD8].

(Derived)

3.2.2.8 [SPF.IIF.11] SPF Helium – SPF BAND 345 Helium Interface

R.SPF345.I.9 The SPF Band 345 shall provide a helium interface to the SPF Helium, as defined in [AD10].

(Derived)

3.2.2.9 [SPF.IIF.08] SPF Vacuum– SPF BAND 345 Vacuum Interface

R.SPF345.I.10 The SPF Band 345 shall provide a vacuum interface to the SPF Vacuum, as defined in [AD9].

(Derived)


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3.3 Environmental

Aspects specifically relating to environmental conditions are specified in this section. These shall include environmental conditions for all operational phases of the item: storage, transportation and operation.

R.SPF345.EL.1 The SPF Band 345 shall be compliant with all local, state and national environmental protection legislation and regulations of South Africa as well as the country where it is manufactured / assembled.

NOTE: Legislation takes precedence over project/contract documentation and requirements. Omission of a law from this requirement does not affect its enforceability. Legislation is also subject to amendment and so the Environmental Laws identified during the Request for Information (copied below) may be modified by the Hosting Agreements and subsequent Acts and Amendments.

R.SPF.EL.1

3.3.1 Operational

R.SPF345.ED.2 The SPF Band 345 shall survive, without any residual damage or performance degradation, when operated under the Deployed Conditions throughout the Deployed Lifetime.

R.SPF.ED.2

R.SPF345.ED.3 The SPF Band 345 shall sustain continuous operation, without performance degradation, under the Precision, Standard and Degraded Operating Conditions throughout the required Deployed Lifetime.

R.SPF.ED.3

R.SPF345.ED.4 The SPF Band 345 shall be fully functional when operated under the Precision, Standard, Degraded and Extreme Operating Conditions throughout the required Deployed Lifetime.

R.SPF.ED.4

R.SPF345.ED.5 The SPF Band 345 shall survive and perform according to the requirements as stated in this specification after being subjected to the Survival Conditions throughout the Deployed Lifetime. (During Survival Conditions, the system may turn itself off for protection.)

R.SPF.ED.5

R.SPF345.ED.6 The SPF Band 345 components mounted to DS shall not induce vibration and shock that exceed the levels as defined in [AD4] section "Mechanical" (DS-SPFB345).

R.SPF.ED.6

R.SPF345.ED.7 The SPF Band 345 components mounted to DS shall perform according to its requirements, as defined in this document, when subjected to the vibration and shock levels as defined in [AD4] section "Mechanical" (DS-SPFB345).

R.SPF.ED.7


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3.3.2 Radio Frequency Interference

R.SPF345.RFI.2 Over the specified frequency band from 50MHz to 20GHz, SPF Band 345 components mounted on the indexer shall not radiate EMI above:

• The Spectral Line Threshold Level depicted in the figure below and measured in a RBW of 0.001% of centre frequency, and

• The Continuum Threshold Level depicted in the figure below and measured in a RBW of 1% of centre frequency.

RF power from the Calibration Noise Source is excluded.

R.SPF.RFI.1

R.SPF345.RFI.3 Over the specified frequency band from 50 MHz to 20 GHz, SPF Band 345 components mounted on the indexer shall contaminate less than 5% of 500 ms data blocks with RFI pulses larger than the Pulsed Threshold level depicted in the figure below when measured in a 10 MHz resolution bandwidth and 1 μs integration time.

R.SPF.RFI.4


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R.SPF345.RFI.4 Over the specified frequency band from 300MHz to 20GHz, the SPF Band 345 shall not add RF power to the signal chain, referenced at the input to the LNA, above:

• The Spectral Line Threshold Level depicted in the figure below and measured in a RBW of 0.001% of centre frequency, and

• The Continuum Threshold Level depicted in the figure below and measured in a RBW of 1% of centre frequency.


R.SPF.RFI.7

3.3.3 Configuration, Control, Monitoring and Remote Support

R.SPF345.CRS.1 The SPF Band 345 Feed Package Controller shall enable patching and upgrade of software and firmware remotely from the SPF Controller.

R.SPF.CRS.1

R.SPF345.CRS.2 The SPF Band 345 Feed Package Controller shall provide an engineering interface that can be accessed remotely by the SPF Controller for detailed diagnostics and low level control.

R.SPF.CRS.2

R.SPF345.CRS.3 The SPF Band 345 Feed Package Controller shall report serial numbers to the SPF Controller for all LRUs that are regularly replaced for maintenance, where practicable.

R.SPF.CRS.3

3.3.4 Transportation

R.SPF345.ET.1 All SPF Band 345 SRUs and LRUs shall be packaged for Transportation Conditions to prevent incurring any residual damage.

R.SPF.ET.1

3.3.5 Storage

R.SPF345.ES.1 All SPF Band 345 LRUs and SRUs shall be packaged for Storage Conditions, without incurring any damage, for a period of at least 2 years.

R.SPF.ES.1


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3.4 Human Factors

R.SPF345.HF.1 The SPF Band 345 ergonomic design shall be compliant with MIL-STD-1472G.

R.SPF.HF.1

3.5 Integrated Logistics Support

3.5.1 Reliability, Availability and Maintainability

R.SPF345.LRA.1 The SPF Band 345 shall be designed for a minimum Deployed Lifetime of 10 years.

R.SPF.LRA.1

R.SPF345.LRA.2 The SPF Band 345 shall have a Mean Maintenance Down-Time of less than 2.5 hours. Note that here MMDT is defined as only the time technicians spent at the antenna.

R.SPF.LRA.2

R.SPF345.LRA.3 The SPF Band 345 Sub-Element shall have a Mean Time Between Maintenance of 15 months per antenna (in addition to a yearly scheduled maintenance).

R.SPF.LRA.3

3.5.2 Repair and Replacement

R.SPF345.LRR.1 SPF Band 345 LRUs and SRUs shall be designed to use standard tools for accessing, removing and replacing the items, and access to equipment and components that require specialised tools shall be minimised.

R.SPF.LRR.1

R.SPF345.LRR.2 SPF Band 345 Modules and components shall be mounted such that where practicable, removal of any single item will not require the removal of other items (component stacking to be avoided where possible).

R.SPF.LRR.3

R.SPF345.LRR.3 SPF Band 345 items identified as ILM Spare Items, shall require a minimum of tuning, calibration, aligning or other actions. Where alignment, calibration or tuning is required, a deterministic procedure for such actions shall be contained in the support publications.

R.SPF.LRR.4

R.SPF345.LRR.4 SPF Band 345 repairable items shall be designed to include maintenance provisions such as test points, accessibility, and plug-in components where practicable.

R.SPF.LRR.5

R.SPF345.LRR.5 SPF Band 345 components shall be designed to be modular where practicable, to enable easy removal and replacement of faulty line replaceable units.

R.SPF.LRR.6

R.SPF345.LRR.6 SPF Band 345 modules and components shall incorporate mounting guides and location where practicable to facilitate module mounting.

R.SPF.LRR.7

R.SPF345.LRR.7 SPF Band 345 modules and components shall incorporate provisions for the preclusion of mounting the wrong module shall be provided (key coding of connectors etc.).

R.SPF.LRR.8


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R.SPF345.LRR.8 SPF Band 345 OLM Spares Items shall be interchangeable with items of the same Part Number and Version with no calibration, tuning or special alignment where practicable.

R.SPF.LRR.9

R.SPF345.LRR.10 SPF Band 345 modules and components shall incorporate Stand-offs and handles to protect system components from damage during shop maintenance.

R.SPF.LRR.11

3.5.3 Product Marking

R.SPF345.LPM.1 SPF Band 345 Cables/Harnesses and their connectors shall be labelled to allow identification while installed.

R.SPF.LPM.1

R.SPF345.LPM.2 SPF Band 345 component mounted connectors shall be labelled to allow identification during installation and maintenance of the Equipment.

R.SPF.LPM.2

R.SPF345.LPM.3 SPF Band 345 Switches and controls used by operators or technical personnel shall have their functions clearly marked in the English language.

R.SPF.LPM.3

R.SPF345.LPM.4 SPF Band 345 Disposable line replaceable units shall be labelled as such.

R.SPF.LPM.4

R.SPF345.LPM.5 SPF Band 345 modules and components requiring special handling to prevent damage to Items (e.g. electrostatic discharge), shall be clearly marked with warning labels.

R.SPF.LPM.5

R.SPF345.LPM.6 SPF Band 345 equipment that, when improperly operated or handled, may jeopardise the safety of personnel or result in a hazardous situation, shall be clearly marked to such effect.

R.SPF.LPM.6

R.SPF345.LPM.7 SPF Band 345 Modules shall be labelled with the following information:

• Product Supplier Name

• Product Name (Supplied by SE for fabricated or subcontracted items)

• Product Part Number (Supplied by SE for fabricated or subcontracted items)

• Product Version (Supplied by SE for fabricated or subcontracted items)

• Product Serial Number

• Electronically readable code (bar code), containing all the above information.

R.SPF.LPM.7

R.SPF345.LPM.8 Product Markings shall withstand all environments and conditions to which the item will be subjected. Product Markings shall be waterproof and not detach or become unreadable with repeated handling.

R.SPF.LPM.8

R.SPF345.LPM.9 SPF Band 345 Product and LRU/SRU Markings shall be clearly visible when the Item is installed.

R.SPF.LPM.9


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3.5.4 ILS Publication

3.5.4.1 Manufacturing Data Packs

R.SPF345.LDM.1 As part of the SPF Band 345 Manufacturing Data Pack, As-Built Data shall be provided as part of the Manufacturing Data Pack. As-Built Data is considered to be:

• Item identification

• Item Data Sheets

• Item Supplier Data

• Assembly Drawings

• Manufacturing Drawings

• Parts Lists as applicable.

R.SPF.LDM.1

R.SPF345.LDM.2 As part of the SPF Band 345 Manufacturing Data Pack, Design Data shall be provided as part of the Manufacturing Data Pack. Design Data is considered to be

• Requirement Specifications

• Architecture Description Documents

• Interface Control Documents

• Qualification Test Procedures and Results

• Acceptance Test Procedures and Results.

R.SPF.LDM.2

3.5.4.2 Support Publications

Not specified.

3.5.5 Training

Not specified.

3.5.6 Supply Support

Not specified.

3.5.7 Packaging Handling and Transportation

R.SPF345.LPA.1 SPF Band 345 packaged LRU’s and SRU’s with a mass of more than 15kg and less than 40kg shall have carrying handles.

R.SPF.LPA.1

R.SPF345.LPA.2 SPF Band 345 packaged LRU’s and SRU’s with a mass of more than 40 kg shall have an integral lifting arrangement (e.g. eye-bolts).

R.SPF.LPA.2


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R.SPF345.LPA.3 The packaging of all SPF Band 345 line replaceable units (LRUs) shall be labelled, with the following information:

• Item Name (from Config Management System) (fabricated or subcontracted items only)

• Item Part Number and Version (from Config Management System) (fabricated or subcontracted items only)

• Item Serial Number where applicable (shall be able to update this for the relevant unit)

• LRU/SRU Supplier Part Number (where applicable)

• LRU/SRU Supplier Identification (where applicable)

• Electronically scannable label (Bar Code)

• Packaged weight

• Container stackability (where applicable)

• Preservation date (where applicable)

• Shelf life (where applicable)

R.SPF.LPA.3

R.SPF345.LPA.4 Packaged LRU's and SRU's shall have the following markings securely attached on the outside of the packaging container:

• Mode of transport "careful transportation"

• "This side up" label

• "Fork lift here" label, where applicable

• Centre of gravity marking, where applicable

• Packaged Item Identification plate, with identification data completed, as specified in the "Package Labelling" requirement

• Where applicable, tamper proof labels for "wrong way up" and "excessive acceleration"

• ESD warnings where applicable

R.SPF.LPA.4

R.SPF345.LPA.6 SPF Band 345 packaging sizes shall consider standard vehicle transportation as well as entry constraints imposed by doors and corridors.

R.SPF.LPA.8

R.SPF345.LPA.7 SPF Band 345 packaging for Spare LRUs and SRUs shall be provided by the supplier of the LRUs and SRUs.

R.SPF.LPA.9

3.5.8 Equipment

R.SPF345.LSE.2 SPF Band 345 Test and support equipment shall not require re-calibration in periods shorter than 12 months.

R.SPF.LSE.4

3.5.9 Facilities

R.SPF345.LSF.1 Requirements for maintenance & storage facilities at all levels of repair for SPF Band 345 shall be identified through an LSA process using modelling/simulation.

R.SPF.LSF.1


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3.6 Product Assurance

3.6.1 Standardisation

R.SPF345.PD.1 SPF Band 345 mechanical fasteners shall have standard metric size and screw thread.

R.SPF.PD.2

3.6.2 Workmanship

Not specified.

3.6.3 Safety and Security

R.SPF345.LPS.1 SPF Band 345 equipment mounted on the indexer shall ensure galvanic connection in accordance to IEC62305 LPL III and with resistance of less than 10 milliohm between the equipment chassis and the lightning protection earth interface provided by the DS.

R.SPF.LPS.1

R.SPF345.LPS.3 To protect equipment internal to SPF Band 345 against residual damage from direct and indirect lightning flashes to the structure and external services, the SPF shall establish, and extend on all interfaces, a LPZ 2 in accordance to IEC62305 LPL III, from the LPZ provided by DS on the power interface and the LPZ it is located in by DS, as defined in [AD4] section "Lightning Protection" (DS-SPFB345).

R.SPF.LPS.3

R.SPF345.SAF.1 SPF Band 345 shall be designed to be locally fail-safe and not be dependent on any external inputs for safety.

R.SPF.SAF.1

R.SPF345.SAF.2 All SPF Band 345 LRUs with electrostatic sensitive components shall be fitted with ESD warning labels.

R.SPF.SAF.2

R.SPF345.SAF.3 If they cannot practicably be eliminated from the SPF Band 345 design, sharp edges, access openings and corners shall be protected with covers or coatings.

R.SPF.SAF.3

R.SPF345.SAF.4 SPF Band 345 components shall provide protection against electrical shock in accordance to SANS 61140.

R.SPF.SAF.4

3.6.4 Design Methods

R.SPF345.PR.1 A risk assessment shall be conducted for each item of SPF Band 345 machinery in accordance with BS EN ISO 12100.

R.SPF.PR.6

3.7 Design Constraints

R.SPF345.PW.1 SPF Band 345 shall have a power consumption that does not exceed 50 VA with a power factor larger than 0.75, except for a 0.5 s period at start-up when the power consumption may not exceed 270 VA when operating at full performance under the Precision, Standard and Degraded Operating Conditions

R.SPF.PW.1


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R.SPF345.PW.2 SPF Band 345 components shall not induce Total Harmonic Distortion (Current) onto the electrical supply that exceed the levels defined in section "Single Phase UPS Power Characteristics" of [AD3].

R.SPF.PW.3

3.8 Precedence and Criticality of Requirements

R.SPF345.PR.2 SPF Band 345 design shall address addressed, in the order of decreasing preference as listed below, in trade-off decisions for improving SPF capabilities beyond the minimum specified:

• Maximise feed sensitivity [R.SPF.P.1]

• Minimize variation in feed sensitivity [R.SPF.P.2]

• Minimize far-out sidelobe peak [R.SPF.P.11]

• Minimize far-out sidelobe extent [R.SPF.P.12]

• Minimize sidelobes within 10° from boresight


R.SPF.PR.9


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4 VERIFICATION

4.1 Verification Definitions

The requirements of section 3 of this document shall be verified by one of the test categories detailed in Table 2.

Table 2: Verification Methods Applicable to the System

Term Abbreviation Description

Formal Test FT The measurement of either mechanical or electrical characteristic using standard measuring equipment. If the measurement technique or equipment needed for the measurement is non-standard, it is described under the appropriate test paragraph number.

Inspection I The inspection of a characteristic either visually or by simple measurement and compared against a drawing, standard or data sheet. Verification by inspection implies that the measurement technique is elementary enough to obviate a formal test procedure.

Demonstration D Verifying a functional characteristic by means of actual demonstration using the hardware itself.

Analysis A Verification of a characteristic by means of analysis using appropriate theoretical models.

The applicable test classes are given in Table 3. Note that which tests to include for acceptance testing will be determined during qualification.

Table 3: Test Classes Applicable to the System

Abbreviation Description

N/A Not applicable

DT Tested/verified during the development phase (first prototypes)

QT Tested/verified during qualification

AT Acceptance test during integration and manufacturing


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4.2 Requirements Verification Matrix

The traceability between the requirements specified in Section 3 and the verification methods specified in Section 4 are shown in Table 4. The descriptions refer to the test definitions in [AD11].

Note: The test definitions given below serve as governing framework for detailed test instructions, if and only if such descriptions are not sufficient in themselves.

Table 4: Verification Cross Reference Matrix

SPF345 Req. ID Requirement Text SPF Req. ID

Test Phase Description

DT QT

R.SPF345.P.1

Under Precision and Standard Operating Conditions, the Single Pixel Feed shall achieve Feed Sensitivity (averaged) of at least 7.1 m2/K in both polarisations over SPF Band 3.

R.SPF.P.1.3 X X

SPF.V2 Noise test (using SPF.AV1 EM beam analysis)

R.SPF345.P.2

Under Precision and Standard Operating Conditions, the Single Pixel Feeds shall achieve Feed Sensitivity (averaged) of at least 6.6 m2/K in both polarisation channels over SPF Band 4.

R.SPF.P.1.4 X X


R.SPF345.P.3

Under Precision and Standard Operating Conditions, the Single Pixel Feeds shall achieve Feed sensitivity (averaged) of at least 8.86 m2/K in both polarization channels over SPF Band 5a.

R.SPF.P.1.5 X X


R.SPF345.P.4

Under Precision and Standard Operating Conditions, the Single Pixel Feeds shall achieve Feed sensitivity (averaged) of at least 6.74 m2/K in both polarization channels over SPF Band 5b.

R.SPF.P.1.6 X X


R.SPF345.P.5

The Feed Sensitivity shall not be less than 80% for SPF band 3 compared to that which is specified in R.SPF345.P.1, at any pointing angle over the full accessible elevation range, under Precision and Standard Operating Conditions, and when calculated as an average over any 1 MHz interval over the specified frequency range in both polarisation channels.

R.SPF.P.2.3 X X


R.SPF345.P.6

The Feed Sensitivity shall not be less than 80% for SPF band 4 compared to that which is specified in R.SPF345.P.2, at any pointing angle over the full accessible elevation range, under Precision and Standard Operating Conditions, and when calculated as an average over any 1 MHz interval over the specified frequency range in both polarisation channels.

R.SPF.P.2.4 X X



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DT QT

R.SPF345.P.7

The Feed Sensitivity shall not be less than 80% for SPF band 5a compared to that which is specified in R.SPF345.P.3, at any pointing angle over the elevation range from zenith down to 30° above the horizon, under Precision and Standard Operating Conditions, and when calculated as an average over any 1 MHz interval over the specified frequency range in both polarisation channels.

R.SPF.P.2.5 X X


R.SPF345.P.8

The Feed Sensitivity shall not be less than 75% for SPF band 5b compared to that which is specified in R.SPF345.P.4, at any pointing angle over the elevation range from zenith down to 30° above the horizon, under Precision and Standard Operating Conditions, and when calculated as an average over any 1 MHz interval over the specified frequency range in both polarisation channels.

R.SPF.P.2.6 X X


R.SPF345.P.9

Assuming perfect reflectors but including the pattern-deforming effect of feed mount tolerances over all bands and the full elevation range and under Precision and Standard Operating Conditions, the on-diagonal Mueller Matrix Patterns shall not vary by more than 3% relative to the peak gain for any rotation around bore sight of up to 5°, down to the -20 dB contour.

R.SPF.P.7 X SPF.AV1 EM beam analysis

R.SPF345.P.10

For SPF Band 345 the total solid angle of sidelobes exceeding 0 dBi and further than either the eighth null or 10° from boresight, whichever is the greatest, assuming ideal reflectors, shall be less than 0.05 sr in any polarisation, over the entire frequency range in each band. Note: There are no specific constraints on the levels of sidelobes within 10° from boresight.



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DT QT

R.SPF345.P.11

For SPF B345 the peak level of sidelobes beyond either the eighth null or 10° from boresight, whichever is the greatest, assuming ideal reflectors, shall not exceed 6 dBi in any polarisation, over the entire frequency range in each band. Note: There are no specific constraints on the levels of sidelobes within 10° from boresight.


R.SPF345.P.12

Under wind loads associated with Degraded Operating Conditions and with a maximum temperature gradient of 8°C across any dimension, the position of the SPF phase reference point, relative to the feed indexer, shall be maintained so that the contribution to the pointing error that cannot be corrected with a static pointing model does not exceed 1.75 arcsec.

R.SPF.P.13 X SPF.AV2: Pointing error analysis

R.SPF345.P.13

Under wind loads associated with Precision and Standard Operating Conditions and with a maximum temperature gradient of 8°C across any dimension, the position of the SPF phase reference point, relative to the feed indexer, shall be maintained so that the contribution to the pointing error that cannot be corrected with a static pointing model does not exceed 0.9 arcsec.

R.SPF.P.21 X SPF.AV2: Pointing error analysis

R.SPF345.P.14

The IXR for each SPF band shall be at least 15 dB within the -3 dB contour, at any frequency over the whole observing bandwidth.

R.SPF.P.24 X

SPF.V1 SPF network analyser test (using SPF.AV1 EM beam analysis)

R.SPF345.P.31

The SPF Feed Packages shall receive dual linear polarisation, with vertical polarisation in the dish symmetry plane ±5° and horizontal polarisation parallel to the horizon ±5°.

R.SPF.P.xx X SPF.V1 SPF network analyser test

R.SPF345.P.15

The SPF Band 3 feed shall meet all requirements over a frequency range from 1.65 to 3.05 GHz for both polarisations simultaneously.

R.SPF.P.20.3 Implied as all tests are over this range

R.SPF345.P.16

The SPF Band 4 feed shall meet all requirements over a frequency range from 2.80 to 5.18 GHz for both polarisations simultaneously.



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R.SPF345.P.17

The SPF Band 5a feed shall meet all requirements over a frequency range from 4.6 to 8.5 GHz for both polarisations simultaneously.


R.SPF345.P.18

The SPF Band 5b feed shall meet all requirements over a frequency range from 8.3 to 15.4 GHz for both polarisations simultaneously.


R.SPF345.P.19

The following design practices shall be employed to limit moisture collection in the signal path of SPF Band 345:

• Use of hydrophobic radome material, where applicable.

• Elimination of traps or crevices susceptible to moisture collection.

R.SPF.P.23 X

Inspection of qualification model and data packs

R.SPF345.P.20

The magnitude of the SPF output spectrum, measured at the Feed Package output ports with the feed on the dish terminated in Cold sky, shall not vary by more than the following, at a given elevation angle, across the specified frequency range: 1) Band 3 <= 4 dBp-p 2) Band 4 <= 4 dBp-p 3) Band 5a <= 2 dBp-p across any 2.5 GHz interval 4) Band 5b <= 2 dBp-p across any 2.5 GHz interval

R.SPF.P.3 X SPF.V1 SPF network analyser test

R.SPF345.P.21

The SPF Band 345 Feed Package outputs shall have return loss of 16 dB or better, based on a 50 Ohm characteristic impedance across the specified frequency ranges.


R.SPF345.P.22

The SPF feed element shall amplify a signal with a nominally flat power spectral density at the LNA input of -188 dBm/Hz, with a nominal (band-averaged) gain of: 1) Band 3: 56±3 dB 2) Band 4: 56±3 dB 3) Band 5a: 56±3 dB 4) Band 5b: 56±3 dB


R.SPF345.P.23

The SPF feed element shall have 3rd order intercept points, referred to the input, of: 1) Band 3 >= -43 dBm 2) Band 4 >= -43 dBm 3) Band 5a >= -43 dBm 4) Band 5b >= -43 dBm

R.SPF.P.6 X SPF.V3 Linearity test


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R.SPF345.P.24

The SPF, under Operational Conditions, measured between the Feed Package input and output ports, shall have a wide band gain stability over 5 s, when averaged over the central 500 MHz of the band and sampled with 20 ms intervals, of <= 0.08% RMS.

R.SPF.P.8 X SPF.V4 Gain stability test

R.SPF345.P.25

The SPFs, under Operational Conditions (including orientation changes), measured between the Feed Package input and output ports, shall have a phase stability of <= 1° peak to peak over 5 minutes when sampled with 5 s intervals.

R.SPF.P.9 X

SPF.V4 Gain stability test SPF.V10 Environmental test

R.SPF345.P.26

SPF Phase stability RMS The SPFs, under Operational Conditions (including orientation changes), measured between the Feed Package input and output ports, shall have a phase stability of <= 0.5° RMS over 5 minutes, after subtracting a linear fit through the data points of the 5 minutes, when sampled with 5 s intervals.

R.SPF.P.10 X

SPF.V4 Gain stability test SPF.V10 Environmental test

R.SPF345.P.27

The SPF Band 3 - 5 RF chains shall survive the following input signals at the input of each LNA with no permanent degradation to performance:

• -6 dBm applied for 10 sec. max.

• +5 dBm applied for 1 sec. max. • +32 dBm pulsed for 2 µsec out of 250 µsec.

[goal].

R.SPF.P.19.3 X SPF.V6 Survival levels test

R.SPF345.P.28 The SPF Band 345 Saturated output power shall not exceed 14 dBm.

R.SPF.P.22 X SPF.V6 Survival levels test

R.SPF345.CIC.1

The SPF Band 345 shall inject a switchable, wideband calibration signal into both polarisation channels (i.e. one signal into both channels), at the earliest possible point preceding the LNA.

R.SPF.CIC.4 X Inspection

R.SPF345.CIC.3

The power spectral density of the switchable calibration signal shall be equivalent to 5 - 13% of Tsys (range inclusive), averaged over any 1 MHz bandwidth across the specified frequency range and with Tsys computed for Cold sky at the lowest specified elevation angle.

R.SPF.CIC.3 X SPF.V2 Noise test


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R.SPF345.CIC.4

Under Operational Conditions the standard deviation of the power of the calibration signal, referenced to the input of the LNA with samples integrated over 500 MHz and 500 ms, shall not exceed 0.04% over any 30 minute interval.

R.SPF.P.16 X SPF.V7 Calibration noise stability test

R.SPF345.CIC.5

Under Operational Conditions the phase difference with which the calibration noise signal is injected into the two RF signal paths shall remain stable to < 0.3° RMS, over the specified frequency range for each band.

R.SPF.P.17 X SPF.AV3 Coupler tolerance analysis

R.SPF345.CIC.6

The sum of the switch ON and switch OFF times of the calibration signal (measured from the edge of the applied switching signal till the calibration signal reaches 50% of its final value) shall not exceed 30 microsec, with jitter not exceeding 70 ns RMS.

R.SPF.P.18 X SPF.V8 Calibration noise switching test

R.SPF345.P.29

The SPF Band 345 shall measure and report the time required to return to full performance after running stable and then being completely “off” for 10 minutes.

R.SPF.P.14 X Demonstration and timing

R.SPF345.P.30

The SPF Band 345 shall utilise a cold head with Helium consumption not exceeding that of the Oxford CryoSystems CoolStar 6/30, reducing below this level during stable operation.

R.SPF.P.15 X Inspection of the selected cold head

R.SPF345.I.1 The SPF Band 345 shall have an EM interface to the Dish Structure

(Implicit) Used in all EM analysis

R.SPF345.I.2

The SPF Band 345 power and ground connections shall have the interconnection characteristics as defined in [AD4] section "Interconnections" (DS-SPFB345).

R.SPF.I.3 X Inspection

R.SPF345.PW.1

The SPF components shall perform according to its requirements, as defined in this document, when supplied with the electrical power with the characteristics as defined in section "Single Phase UPS Power Characteristics" of [AD3].

R.SPF.PW.2 X Inspection of the data pack

R.SPF345.I.3

The SPF Band 345 components mounted to DS shall have the mechanical characteristics as defined in [AD4] section "Mechanical" (DS-SPFB345).


R.SPF345.I.4

The SPF Band 345 RF connections shall have the interconnection characteristics as defined in [AD6].



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R.SPF345.I.5

The SPF Band 345 shall receive noise diode control signals from the SPFRx with the physical characteristics as defined in [AD6].

R.SPF.I.4 X Demonstration

R.SPF345.I.6

The SPF Band 345 shall implement noise diode control signals from the SPFRx with the logical characteristics as defined in [AD6].

R.SPF.I.6 X Demonstration

R.SPF345.I.7

The SPF Band 345 fibre connections shall have the interconnection characteristics as defined in [AD7].


R.SPF345.I.8

The SPF Band 345 shall provide a control and data interface to the SPF Controller, as described in [AD8].

(Derived) X Demonstration

R.SPF345.I.9

The SPF Band 345 shall provide a helium interface to the SPF Helium, as defined in [AD10].

(Derived) X Inspection

R.SPF345.I.10

The SPF Band 345 shall provide a vacuum interface to the SPF Vacuum, as defined in [AD9].

(Derived) X Inspection

R.SPF345.EL.1

The SPF Band 345 shall be compliant with all local, state and national environmental protection legislation and regulations of South Africa as well as the country where it is manufactured / assembled. NOTE: Legislation takes precedence over project/contract documentation and requirements. Omission of a law from this requirement does not affect its enforceability. Legislation is also subject to amendment and so the Environmental Laws identified during the Request for Information (copied below) may be modified by the Hosting Agreements and subsequent Acts and Amendments.

R.SPF.EL.1 X Design Review

R.SPF345.ED.2

The SPF Band 345 shall survive, without any residual damage or performance degradation, when operated under the Deployed Conditions throughout the Deployed Lifetime.

R.SPF.ED.2 X

Analysis of the data pack; performance tests before and after thermal soak. Hail test.

R.SPF345.ED.3

The SPF Band 345 shall sustain continuous operation, without performance degradation, under the Precision, Standard and Degraded Operating Conditions throughout the required Deployed Lifetime.

R.SPF.ED.3 X SPF.V10 Environmental test


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R.SPF345.ED.4

The SPF Band 345 shall be fully functional when operated under the Precision, Standard and Degraded Operating Conditions throughout the required Deployed Lifetime.


R.SPF345.ED.5

The SPF Band 345 shall survive and perform according to the requirements as stated in this specification after being subjected to the Survival Conditions throughout the Deployed Lifetime. (During Survival Conditions, the system may turn itself off for protection.)


R.SPF345.ED.6

The SPF Band 345 components mounted to DS shall not induce vibration and shock that exceed the levels as defined in [AD4] section "Mechanical" (DS-SPFB345).

R.SPF.ED.6 X SPF.V11 Induced vibration test

R.SPF345.ED.7

The SPF Band 345 components mounted to DS shall perform according to its requirements, as defined in this document, when subjected to the vibration and shock levels as defined in [AD4] section "Mechanical" (DS-SPFB345).


R.SPF345.RFI.2

Over the specified frequency band from 50MHz to 20GHz, SPF Band 345 components mounted on the indexer shall not radiate EMI above:

• The Spectral Line Threshold Level depicted in section 3.3.2 and measured in a RBW of 0.001% of centre frequency, and

• The Continuum Threshold Level depicted in section 3.3.2 and measured in a RBW of 1% of centre frequency.


R.SPF.RFI.1 X SPF.V12 SPF RFI test

R.SPF345.RFI.3

Over the specified frequency band from 50 MHz to 20 GHz, SPF components mounted on the indexer shall contaminate less than 5% of 500 ms data blocks with RFI pulses larger than the Pulsed Threshold level depicted in section 3.3.2 when measured in a 10 MHz resolution bandwidth and 1 μs integration time.



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R.SPF345.RFI.4

Over the specified frequency band from 300MHz to 20GHz, the SPF shall not add RF power to the signal chain, referenced at the input to the LNA, above:

• The Spectral Line Threshold Level depicted in section 3.3.2 and measured in a RBW of 0.001% of centre frequency, and

• The Continuum Threshold Level depicted in section 3.3.2 and measured in a RBW of 1% of centre frequency.



R.SPF345.CRS.1

The SPF Band 345 Feed Package Controller shall enable patching and upgrade of software and firmware remotely from the SPF Controller.

R.SPF.CRS.1 X Demonstration

R.SPF345.CRS.2

The SPF Band 345 Feed Package Controller shall provide an engineering interface that can be accessed remotely by the SPF Controller for detailed diagnostics and low level control.


R.SPF345.CRS.3

The SPF Band 345 Feed Package Controller shall report serial numbers to the SPF Controller for all LRUs that are regularly replaced for maintenance, where practicable.


R.SPF345.ET.1

All SPF Band 345 SRUs and LRUs shall be packaged for Transportation Conditions to prevent incurring any residual damage.

R.SPF.ET.1 X Inspection of data pack

R.SPF345.ES.1

All SPF Band 345 LRUs and SRUs shall be packaged for Storage Conditions, without incurring any damage, for a period of at least 2 years.

R.SPF.ES.1 X Inspection of data pack

R.SPF345.HF.1 The SPF Band 345 ergonomic design shall be compliant with MIL-STD-1472G.

R.SPF.HF.1 X Inspection of data pack

R.SPF345.LRA.1 The SPF Band 345 shall be designed for a minimum Deployed Lifetime of 50 years.

R.SPF.LRA.1 X Analysis of the data pack

R.SPF345.LRA.2

The SPF Band 345 shall have a Mean Maintenance Down-Time of less than 2.5 hours. Note that here MMDT is defined as only the time technicians spent at the antenna.


R.SPF345.LRA.3

The SPF Band 345 Sub-Element shall have a Mean Time Between Maintenance of 15 months per antenna (in addition to a yearly scheduled maintenance).



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R.SPF345.LRR.1

SPF Band 345 LRUs and SRUs shall be designed to use standard tools for accessing, removing and replacing the items, and access to equipment and components that require specialised tools shall be minimised.

R.SPF.LRR.1 X Inspection of data pack

R.SPF345.LRR.2

SPF Band 345 Modules and components shall be mounted such that where practicable, removal of any single item will not require the removal of other items (component stacking to be avoided where possible)


R.SPF345.LRR.3

SPF Band 345 items identified as ILM Spare Items, shall require a minimum of tuning, calibration, aligning or other actions. Where alignment, calibration or tuning is required, a deterministic procedure for such actions shall be contained in the support publications.


R.SPF345.LRR.4

SPF Band 345 repairable items shall be designed to include maintenance provisions such as test points, accessibility, and plug-in components where practicable.


R.SPF345.LRR.5

SPF Band 345 components shall be designed to be modular where practicable, to enable easy removal and replacement of faulty line replaceable units.


R.SPF345.LRR.6

SPF Band 345 modules and components shall incorporate mounting guides and location where practicable to facilitate module mounting.


R.SPF345.LRR.7

SPF Band 345 modules and components shall incorporate provisions for the preclusion of mounting the wrong module shall be provided (key coding of connectors etc.).


R.SPF345.LRR.8

SPF Band 345 OLM Spares Items shall be interchangeable with items of the same Part Number and Version with no calibration, tuning or special alignment where practicable.


R.SPF345.LRR.10

SPF Band 345 modules and components shall incorporate Stand-offs and handles to protect system components from damage during shop maintenance.


R.SPF345.LPM.1

SPF Band 345 Cables/Harnesses and their connectors shall be labelled to allow identification while installed.

R.SPF.LPM.1 X Inspection of items


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R.SPF345.LPM.2

SPF Band 345 component mounted connectors shall be labelled to allow identification during installation and maintenance of the Equipment.


R.SPF345.LPM.3

SPF Band 345 Switches and controls used by operators or technical personnel shall have their functions clearly marked in the English language.


R.SPF345.LPM.4 SPF Band 345 Disposable line replaceable units shall be labelled as such.

R.SPF.LPM.4 X Inspection of data pack / items

R.SPF345.LPM.5

SPF Band 345 modules and components requiring special handling to prevent damage to Items (e.g. electrostatic discharge), shall be clearly marked with warning labels.


R.SPF345.LPM.6

SPF Band 345 equipment that, when improperly operated or handled, may jeopardise the safety of personnel or result in a hazardous situation, shall be clearly marked to such effect.


R.SPF345.LPM.7

SPF Band 345 Modules shall be labelled with the following information:

• Product Supplier Name

• Product Name (Supplied by SE for fabricated or subcontracted items)

• Product Part Number (Supplied by SE for fabricated or subcontracted items)

• Product Version (Supplied by SE for fabricated or subcontracted items)

• Product Serial Number • Electronically readable code (bar code),

containing all the above information.


R.SPF345.LPM.8

Product Markings shall withstand all environments and conditions to which the item will be subjected. Product Markings shall be waterproof and not detach or become unreadable with repeated handling.


R.SPF345.LPM.9

SPF Band 345 Product and LRU/SRU Markings shall be clearly visible when the Item is installed.



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R.SPF345.LDM.1

As part of the SPF Band 345 Manufacturing Data Pack, As-Built Data shall be provided as part of the Manufacturing Data Pack. As-Built Data is considered to be:

• Item identification

• Item Data Sheets

• Item Supplier Data

• Assembly Drawings

• Manufacturing Drawings • Parts Lists as applicable.

R.SPF.LDM.1 X Inspection of data pack

R.SPF345.LDM.2

As part of the SPF Band 345 Manufacturing Data Pack, Design Data shall be provided as part of the Manufacturing Data Pack. Design Data is considered to be

• Requirement Specifications

• Architecture Description Documents

• Interface Control Documents

• Qualification Test Procedures and Results • Acceptance Test Procedures and Results.

R.SPF.LDM.2 X Inspection of data pack

R.SPF345.LPA.1

SPF Band 345 packaged LRU’s and SRU’s with a mass of more than 15kg and less than 40kg shall have carrying handles.

R.SPF.LPA.1 X Inspection of data pack

R.SPF345.LPA.2

SPF Band 345 packaged LRU’s and SRU’s with a mass of more than 40 kg shall have an integral lifting arrangement (e.g. eye-bolts).


R.SPF345.LPA.3

The packaging of all SPF Band 345 line replaceable units (LRUs) shall be labelled, with the following information:

• Item Name (from Config Management System) (fabricated or subcontracted items only)

• Item Part Number and Version (from Config Management System) (fabricated or subcontracted items only)

• Item Serial Number where applicable (shall be able to update this for the relevant unit)

• LRU/SRU Supplier Part number (where applicable)

• LRU/SRU Supplier Identification (where applicable)

• Electronically scannable label (Bar Code)

• Packaged weight

• Container stackability (where applicable)

• Preservation date (where applicable) • Shelf life (where applicable)



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R.SPF345.LPA.4

Packaged LRU's and SRU's shall have the following markings securely attached on the outside of the packaging container:

• Mode of transport "careful transportation"

• "This side up" label

• "Fork lift here" label, where applicable

• Centre of gravity marking, where applicable

• Packaged Item Identification plate, with identification data completed, as specified in the "Package Labelling" requirement

• Where applicable, tamper proof labels for "wrong way up" and "excessive acceleration"

• ESD warnings where applicable

R.SPF.LPA.4 X Inspection of data pack / items

R.SPF345.LPA.6

SPF Band 345 packaging sizes shall consider standard vehicle transportation as well as entry constraints imposed by doors and corridors.


R.SPF345.LPA.7

SPF Band 345 packaging for Spare LRUs and SRUs shall be provided by the supplier of the LRUs and SRUs.


R.SPF345.LSE.2

SPF Band 345 Test and support equipment shall not require re-calibration in periods shorter than 12 months.

R.SPF.LSE.4 X Inspection of data pack

R.SPF345.LSF.1

Requirements for maintenance & storage facilities at all levels of repair for SPF Band 345 shall be identified through an LSA process using modelling/simulation.

R.SPF.LSF.1 X Analysis of data pack

R.SPF345.PD.1 SPF Band 345 mechanical fasteners shall have standard metric size and screw thread.

R.SPF.PD.2 X Inspection of data pack

R.SPF345.LPS.1

SPF Band 345 equipment mounted on the indexer shall ensure galvanic connection in accordance to IEC62305 LPL III and with resistance of less than 10 milliohm between the equipment chassis and the lightning protection earth interface provided by the DS.

R.SPF.LPS.1 X

Inspection of data pack / Conductance measurement


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R.SPF345.LPS.3

To protect equipment internal to SPF Band 345 against residual damage from direct and indirect lightning flashes to the structure and external services, the SPF shall establish, and extend on all interfaces, a LPZ 2 in accordance to IEC62305 LPL III, from the LPZ provided by DS on the power interface and the LPZ it is located in by DS, as defined in [AD4] section "Lightning Protection" (DS-SPFB345).

R.SPF.LPS.3 X Inspection of data pack

R.SPF345.SAF.1

SPF Band 345 shall be designed to be locally fail-safe and not be dependent on any external inputs for safety.

R.SPF.SAF.1 X Inspection of data pack

R.SPF345.SAF.2

All SPF Band 345 LRUs with electrostatic sensitive components shall be fitted with ESD warning labels.


R.SPF345.SAF.3

If they cannot practicably be eliminated from the SPF Band 345 design, sharp edges, access openings and corners shall be protected with covers or coatings.


R.SPF345.SAF.4

SPF Band 345 components shall provide protection against electrical shock in accordance to SANS 61140.


R.SPF345.PR.1

A risk assessment shall be conducted for each item of SPF Band 345 machinery in accordance with BS EN ISO 12100.

R.SPF.PR.6 X Inspection of data pack

R.SPF345.PW.1

SPF Band 345 shall have a power consumption that does not exceed 50 VA with a power factor larger than 0.75, except for a 0.5 s period at start-up when the power consumption may not exceed 270 VA when operating at full performance under the Precision, Standard and Degraded Operating Conditions s

R.SPF.PW.1 X SPF.V13 Electrical Interface test

R.SPF345.PW.2

SPF Band 345 components shall not induce Total Harmonic Distortion (Current) onto the electrical supply that exceed the levels defined in section "Single Phase UPS Power Characteristics" of [AD3].

R.SPF.PW.3 X SPF.V13 Electrical Interface test


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R.SPF345.PR.2

SPF Band 345 design shall address addressed, in the order of decreasing preference as listed below, in trade-off decisions for improving SPF capabilities beyond the minimum specified:

• Maximise feed sensitivity [R.SPF.P.1]

• Minimize variation in feed sensitivity [R.SPF.P.2]

• Minimize far-out sidelobe peak [R.SPF.P.11]

• Minimize far-out sidelobe extent [R.SPF.P.12]

• Minimize sidelobes within 10° from boresight


R.SPF.PR.9 Design Review


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5 PACKAGING

This section is not applicable.

6 NOTES

This section contains information of a general or explanatory nature.

6.1 Explanatory Notes

None

6.2 List of Unresolved Issues

None

SKA-TEL-DSH-0000085_Rev1_SPFB345DevelopmentSpecificationAdobe Sign Document History 09/27/2018

Created: 09/27/2018

By: Thomas Kusel ([email protected])

Status: Signed

Transaction ID: CBJCHBCAABAA8aje5UhI93FsQv2XrvFkfz111zmPkQd4

"SKA-TEL-DSH-0000085_Rev1_SPFB345DevelopmentSpecification" History

Document created by Thomas Kusel ([email protected])09/27/2018 - 5:59:55 AM PDT- IP address: 196.210.11.177

Document e-signed by Thomas Kusel ([email protected])Signature Date: 09/27/2018 - 6:02:35 AM PDT - Time Source: server- IP address: 196.210.11.177

Document emailed to Angela Taylor ([email protected]) for signature09/27/2018 - 6:02:36 AM PDT

Document viewed by Angela Taylor ([email protected])09/27/2018 - 6:03:47 AM PDT- IP address: 163.1.19.1

Document e-signed by Angela Taylor ([email protected])Signature Date: 09/27/2018 - 8:25:21 AM PDT - Time Source: server- IP address: 163.1.19.1

Document emailed to Isak Theron ([email protected]) for signature09/27/2018 - 8:25:22 AM PDT

Document viewed by Isak Theron ([email protected])09/27/2018 - 11:45:14 AM PDT- IP address: 41.164.24.90

Document e-signed by Isak Theron ([email protected])Signature Date: 09/27/2018 - 11:45:52 AM PDT - Time Source: server- IP address: 41.164.24.90

Signed document emailed to Angela Taylor ([email protected]), Thomas Kusel([email protected]) and Isak Theron ([email protected])09/27/2018 - 11:45:52 AM PDT