design guide for the dual diversity tta system top amplifiers/432 dual...dual diversity tta system....
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TX RX Systems Inc. Manual 7-9501-Rough Draft1 07/01/10 Page 1
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ManualNumber7-9501-1
Design Guide for the Dual Diversity TTA System
TX RX Systems Inc. Manual 7-9501 07/01/10 Page 2
Table of Contents
Tower Top Amplifier (DS43283H01T) ................................................................ 3Multicoupler Control Unit (DS43283H01M) ....................................................... 4Control Management Unit (DS43283H01C)....................................................... 6Optional Narrowband Filter................................................................................ 8MCU Expansion Deck (75-83H-432)................................................................... 8Design Considerations ....................................................................................... 9Frequently Asked Questions ........................................................................... 10Background Material and other resources ..................................................... 11
TX RX Systems Inc. Manual 7-9501 07/01/10 Page 3
Design ComponentsTower Top Amplifier (DS43283H01T) –The Tower Top Amplifier (TTA) provides thegain and first level of selectivity for the receive system. The new Dual Diversity TTA (Figure 1) isconstructed in a Polyester material to reduce weight while maintaining environmental integrity.The TTA has two independent amplifier networks that amplify each branch of the diversity sys-tem. The networks are balanced to provide accurate signal balance at each branch of the DualDiversity receive system. There are two antenna inputs (Ant A and Ant B).
Surge792-824Filter
50
LNA
Surge
Surge792-824Filter
30 dB
30 dB
Term Control
3 dB
50
LNA
Surge Surge
Ant A Ant B
RF A RF B Test
Dual DiversityTTA Assembly
Dual Quad Amps30 dB Gain
Figure 1: Picture and Block Diagram of Dual Diversity TTA.
TX RX Systems Inc. Manual 7-9501 07/01/10 Page 4
Multicoupler Control Unit (DS43283H01M) –The Multicoupler Control Unit (MCU)(Figure 2 & Figure 3) provides additional amplification to overcome the distribution loss of the Mul-ticoupler. The MCU has the ability to distribute to 16 Dual receivers and can be expanded to 32with an additional shelf. Each network has independent attenuators on the input and output toadjust the reserve gain and balance the networks. Each branch of the TTA is monitored withinthe MCU to provide alarms for any failures that may occur. Form C relay outputs are provided tointerface to alarm interfaces. The standard unit is designed for 120 VAC but by adding 48 to theend of the part number (DS43283H01M48) the unit will be designed for -48 VDC.
792-824MHzFilter
792-824MHzFilter
A AlarmNC
COM
NO
NC
COM
NO
B Alarm
CurrentMonitor
CurrentMonitor
2 WayDivider
A and BExpansion
2 x 16 Way Divider
2 WayDivider
Tower Top AmplifierTermination
Control
VariableAttenuator
VariableAttenuator
VariableAttenuator
VariableAttenuator
LNA LNA
+12V
+12V+12V
Front PanelDisplay Assembly
Power Supply+12V
RX-B
RX-A
Test Port
RF A In RF B In TestDual Diversity
MCU Assembly
NOTE: All unused expansionports on this assembly must beterminated with a 50 ohm load.
Figure 2: MCU Picture and Block Diagram.
TX RX Systems Inc. Manual 7-9501 07/01/10 Page 5
Tower Top Box
MCU
ToStation Receivers
"A" and "B"Expansion
AlarmContacts
Ground
"Test" "B" "A"
"B"Antenna
"A"Antenna
WARNING
Failure to groundthe TTA System
properly can resultin equipment failure
caused byelectrical surges.
10
1
1
1
1
1
1
1
1
2 2 2
2 2 2
11
8
8
7
BNCTestPort
To BaseStation
"A" and "B"Expansion
BuildingEntry-PointGround Plate
CopperGround Strap
FromRepeaters
7
9
7
7
3
3
3
3 3 3 3 3
5 5
2 2
4
3
4 4
TransmitCombiner
MCU
Master Ground Buss
Internal Perimeter Ground (Halo)
Tower Top Box
Test Ant"A"
Ant"B"
"A""B"
Entry-PointGround Buss
To ElectricalService Ground
Equipment RackMaster Ground Bar
*
*
*
*
**
Figure 3: Physical and Electrical Installation of MCU.
TX RX Systems Inc. Manual 7-9501 07/01/10 Page 6
Control Management Unit (DS43283H01C) –The Dual Diversity Control ManagementUnit (CMU) (Figure 4 & Figure 5) interfaces the TTA to the ESS GTR8000 radio system. The CMUprovides two RF outputs per receive channel. One of the outputs interfaces with the ESS whilethe other is available for testing and Spectrum Analysis. There are no receive ports or expan-sion port provided since the receive distribution is included in the ESS. Each network has inde-pendent attenuators to adjust the reserve gain and balance the networks. Each branch of theTTA is monitored within the CMU to provide alarms for any failures that may occur. Form Crelay outputs are provided to interface to alarm interfaces. The standard unit is designed for 120VAC but by adding 48 to the end of the part number (DS43283H01C48) the unit will bedesigned for -48 VDC.
792-824MHzFilter
792-824MHzFilter
CurrentMonitor
CurrentMonitor
VariableAttenuator
6 dB6 dB
VariableAttenuator
PowerSupply+12V
+12V
+12V+12V
Front PanelDisplay
Assembly
TestPort
Terminate with50 ohm load whennot in use
Terminate with50 ohm load whennot in use
RX TestB
RXB
RX TestA
RXA
RX A In RX B In TestDual Diversity
CMU Assembly
A AlarmNC
COM
NO
NC
COM
NO
B Alarm
Tower Top AmplifierTermination
Control
Figure 4: CMU Picture and Block Diagram.
TX RX Systems Inc. Manual 7-9501 07/01/10 Page 7
Tower Top Box
CMU
"A"RX Out
"B"RX Out
AlarmContacts
Ground
"Test" "B" "A"
"B"Antenna
"A"Antenna
WARNING
Failure to groundthe TTA System
properly can resultin equipment failure
caused byelectrical surges.
10
1
1
1
1
1
1
1
1
2 2 2
2 2 2
11
8
8
7
BNCTestPort
BuildingEntry-PointGround Plate
"A" RX Out
"B" RX OutCopper
Ground Strap
FromRepeaters
79
7
7
3
3
3
3 3 3 3 3
5 5
2 2
4
3
4 4
TransmitCombiner
CMU
Master Ground Buss
Internal Perimeter Ground (Halo)
Tower Top Box
Test Ant"A"
Ant"B"
"A""B"
Entry-PointGround Buss
To ElectricalService Ground
Equipment RackMaster Ground Bar
*
*
*
*
**
Figure 5: Physical and Electrical Installation of CMU.
TX RX Systems Inc. Manual 7-9501 07/01/10 Page 8
Ground
Figure 6: Optional Narrowband Filter.
Figure 7: Optional Expansion Deck.
Optional Narrowband Filter - The nar-rowband filter is designed to help limitthe bandwidth of the MCU style system.The filter is not used in CMU style sys-tems. One individual filter is required forboth the “A” and “B” channel of the sys-tem. The option is shipped from the fac-tory as shown in Figure 6 ready to beinterconnected to the MCU deck. It isrecommended that the optional filter bemounted in the same rack just above theMCU deck. There are a total of 9 differ-ent narrowband f i l ters available asshown in the table below.
OptionalFilter
Model #
OperatingRange (MHz)
Band-width(MHz)
89-83F-02D-03 792 to 806 3
89-83F-02D-06 792 to 806 6
89-83F-02D-09 792 to 806 9
89-83F-02D-14 792 to 806 14
89-86A-02D-03 806 to 824 3
89-86A-02D-05 806 to 824 5
89-86A-02D-10 806 to 824 10
89-86A-02D-15 806 to 824 15
89-86A-02D-18 806 to 824 18
Optional Narrowband Filters.
MCU Expansion Deck (75-83H-432) -The multicoupler expansion deck willincrease the total multicoupler outputs ofthe MCU style system to 32. The expan-sion deck is not used with the CMU stylesystem. The optional deck is shipped withthe required interconnect cables (asshown in figure 7) and is designed to beinstalled in the same rack but below theMCU deck.
TX RX Systems Inc. Manual 7-9501 07/01/10 Page 9
Design ConsiderationsSurge Protectors – The Dual Diversity system utilizes standard receive DC Pass surge protec-tors. These surge protectors must be provided by the engineer. The recommended surgearrestors (Figure 8) from PolyPhaser are shown in Figure 3 and Figure 5 above and designatedas item 8, 9, and 11. Torquing specification obtained with proper Torque Wrenches is requiredto properly tighten all connectors. See Torquing Initiative document for more information. The109 is an optimized arrestor with improved performance. The TSX protector is not only an opti-mized protector but also complies with our 150 dBc PIM and 25kW PIP requirements. All trans-mit protectors will utilize 7-16 DIN connectors.
Test Cable – The test cable connects the Control Unit with the TTA. This allows the TTA to betested from the bottom of the tower but emulates a signal at the input to the TTA. TheTest Cable should be constructed with LDF4 or equivalent ½” Heliax. Superflex cable isnever recommended for outside use. A surge protector must be installed at the exit tothe building.
Testing and Alignment – Testing the TTA system involves following the 5-Step procedure foreach network of the Diversity system. The Reserve gain is adjusted according to the pro-cedure. After both sections of the system are aligned the exact difference between eachnetwork must be determined. Using the network with the highest signal increase theattenuator until both networks have the same signal level at their output.
Standalone or interface to other radios – The MCU was designed to allow individual radios tobe connected to the TTA system. The ESS can also be utilized to interface external receiversand allow radio expansion outside the ESS.
Figure 8: PolyPhaser Surge Arrester Part Number and Picture.
DS1090501WA (N male to antenna) (N female to equipment)
DS1090501WB (N female to antenna) (N female to equipment)
Receive Cable andTest Port Protector
DSTSXDFMBF (DIN female / male)DSTSXDFFBF (DIN female / female)
Transmit Protector
TX RX Systems Inc. Manual 7-9501 07/01/10 Page 10
Frequently Asked Questions (FAQ)Q – Can the ESS supply distribution to other radios outside the ESS cabinet?
A – Yes. The signal is taken from one of the unused ports on the Site RMC and distributed to otherradios. Careful adjustment of gain must be considered and balanced sensitivity must be verified afterinstallation. Distribution power splitting must be done with separate Power splitting.
Q – Can an ESS cabinet be fed from an MCU?
A – Yes. When the ESS is connected to the MCU there must be an additional 3 dB attenuator installedbetween the MCU and ESS to balance the extra amplification in the ESS.
Q – Should the unused ports on the MCU be terminated?
A – No. Internal splitters maintain isolation without the need for external termination. However, unusedexpansion ports must be externally terminated.
Q – Can the Dual Diversity TTA be ordered and used on a single receive system?
A – Yes. The Dual Diversity TTA is identical in gain, selectivity, and performance to the standard 428and 428B. If a customer plans to migrate to Astro 25 Phase 2 they may want to install the new DualDiversity TTA now to allow migration at a later date. The two branches can be installed with twoantennas, two receive cables, and two branches of amplification. The second branch (Rx B) wouldnot be connected to the ESS until the migration occurs.
Q – Is the PolyPhaser for the main receive line the same as the one used on the current 428 TTA?
A – No. The PolyPhaser surge protector used in the 428 contains a data modem to combine telemetrydata on the RF line. The new TTA does not require a separate data line because the data is applieddirectly to the RF cable.
Q – Is the Surge Protector used on the receive line included with the TTA?
A – No. The new TTA combines the data within the Control Unit and does not require a data modem.For this reason the responsibility of supplying the surge protector falls on Motorola. The engineermust include the receive line surge protector in their design.
Q – Could two 428 TTA systems be used instead of the Dual Diversity TTA?A – Yes. While from an engineering and Physics standpoint this would work, but you would need twotest cables and the balance between the two would never be as good as the single Dual Diversity TTA.Additionally the Dual Diversity TTA sells for around 1.7 times the price of the 428 instead of double if youordered two 428 systems.
TX RX Systems Inc. Manual 7-9501 07/01/10 Page 11
Bryan Corley
Bryan Corley Principal Staff Engineer
Motorola, Inc 12515 Saracen Cypress, TX 77429 U.S.A.
+1 281 469 0762 office +1 281 703 5666 mobile [email protected]
Motorola Contact
Background Material and other resourcesDual Diversity TTA and MCU marketing sheethttp://compass.mot.com/doc/351203266/Dual_DiversityTTA_+_MCU_Marketing_Sheet.pdfBTG (TxRx) marketing sheet containing the detailed technical specifications on the Dual Diversity TTA and MCU shelf.
Dual Diversity TTA and CMU marketing sheet http://compass.mot.com/doc/351203267/Dual_DiversityTTA_+_CMU_Marketing_Sheet.pdfBTG (TxRx) marketing sheet containing the detailed technical specifications on the Dual Diversity TTA and CMU shelf.
Dual Diversity TTA Manual http://compass.mot.com/doc/354324649/Dual_Diversity_Manual_7-9484-1.pdfBTG (TxRx) manual detailing all of the information required to install, optimize, and troubleshoot the Dual Diversity TTA.
Dual Diversity Best Practices for P25 Phase 2 Whitepaperhttp://compass.mot.com/doc/351203265/Diversity_Best_Practices_for_P25_Phase_2.pdfThis Whitepaper describes the detailed information required for Diversity design as it relates to P25 Phase 2. Detailed information on antenna placement, coverage improvement, and design guidelines are con-tained in this document.
5 Step Program for Receiver Multicoupler verificationhttp://compass.mot.com/doc/351187695/Five_Step_Program_v7_0.pdfThis document describes the test procedure for testing, aligning, and troubleshooting TTA systems. This document should be used for every TTA acceptance test plan. For more information or for additional assistance please contact:
Don HustonBird Technologies GroupMotorola Account Manager& Technical Trainer
(440) 519-2228 (work)(216) 276-2938 (mobile)
[email protected] Aurora RoadSolon, Ohio 44139
TXRX Systems Contact