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RFU-C - OMT Installation

Doc ID: DOC-00019845 Rev a.04 

Part ID: BM-0140-0

RFU-C OMT(Orthogonal Mode Transducer)

Installation Guide

Kits Needed to Perform the Installation

Item Description Quantity Remarks

1 ANTENNA OMT ADAPTOR 1

2 RFU-C OMT 1

3 RFU-C RADIO 2 One is optional if using item #4 or #5

4 RFU-C OMT ADAPTOR KIT 1 Optional

5 RFU-C OMT SHORT 1 Optional

Required Tools

Metric offset hexagon key wrench 6

Metric offset hexagon key wrench 3

Basic Assembly

1. Prior to the installation, follow the antenna manufacturer

instructions to switch to circular adaptor (remove the

existing rectangular transition, swap the O-ring, and install

the circular transition instead).

2. Mount the OMT kit on the antenna using four M8 screws

and washers (supplied with the OMT kit). Do not tighten

them yet, to allow rotation of the entire assembly.

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RFU-C - OMT Installation

Doc ID: DOC-00019845 Rev a.04 

Part ID: BM-0140-0

3. Mount the two O-Rings (supplied with the OMT kit) on the

OMT body. Pay attention to the mounting direction, as

shown in the section view.

4. Prior to radio installation, remove the protective sticker

from both radios.

5. Mount both radios, using four M8 screws and washers

(supplied with the RFU-C kit) through the radio and OMT

holder, and tighten them. Pay attention to the polarization

mounting direction.

6. Tilt the entire assembly, as described in the XPIC link

alignment procedure, to achieve maximum XPD (Cross

Polar Differentiation). After link alignment, tighten the four

M8 screws (left open in step 2 above).

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RFU-C - OMT Installation

Doc ID: DOC-00019845 Rev a.04 

Part ID: BM-0140-0

Remote Configurations

When remote configuration is required, the OMT is attached directly to the antenna and the RFU-Cs are

installed remotely, using a flexible waveguide.

This section describes the required items and procedures for remote installation.

Remote configurations include:

2+0 (2 x 1+0 remote connection to OMT)

2+2 (2 x 1+1 remote connection to OMT)

2+0/2+2 Installations

Frequencies 13-38 GHz do not require adaptors

Frequencies 6-11 GHz require adaptors, as describe below

With RFU-C OMT Adaptors:

1. For UDR70, UBR84, and UBR100, mount the O-

Ring (supplied with the OMT kit).

2. For UBR84 and UBR100, mount the OMT

adaptor (with its installed sealing gasket) on the

OMT, and tighten using four M4 screws and

washers (supplied with the OMT adaptor kit).

3. The flexible waveguide should be mounted without its

gasket (only for the OMT side).

4. For UDR70 (6 GHz), mount OMT Adaptor #1 on

the OMT, and tighten using four M4 screws and

washers (supplied with the OMT adaptor kit).

Then mount OMT Adaptor #2 on OMT Adaptor

#1, and tighten using four M4 screws and washers

(supplied with the OMT adaptor kit).

5. For all frequencies, connect the flexible

waveguide to its relevant frequency.

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RFU-C - OMT Installation

Doc ID: DOC-00019845 Rev a.04 

Part ID: BM-0140-0

1+0, ready for 2+0

If you are installing a 1+0 configuration, and want to be ready for 2+0 configurations (double capacity), a "short"

will be used to terminate the unused port. Later, when an additional RFU will be installed on the second port, the

"short" will be removed.

This steps below describe the required items and procedures for the installation.

With RFU-C OMT Short:

1. For UDR70, UBR84, and UBR100, mount the OMT short

(with its installed sealing gasket) using four screws and

washers (supplied with the OMT short kit).

2. For UBR120, UBR140, UBR220, and UBR320, mount the

sealing O-ring and the OMT short using four screws and

washers (supplied with the OMT short kit).

Important!

For the warranty to be honored, install the unit in accordance with the instructions above.