User's Manual

ManualsBrandsHarris Corporation RF Communications Division ManualsElectronicsXG-100LPA Low Band Power Amplifier

14221-1200-4010, Rev. B

17.2 MRU TRANSMITTING INTO A 50-OHM LOAD/TERMINATOR

1. Turn off the Unity mobile radio.

2. At the rear of the MRU, disconnect the antenna cable from the antenna connector (TNC connector

labeled “MB ANT”).

3. If it is not already, label this cable as the “MRU Antenna” cable. This should be the cable from the

highest (vehicle rooftop-mounted) antenna.

4. Using the Type N male to TNC male coaxial test cable, connect the antenna connector on the rear of

the MRU (connector labeled “MB ANT”) to the wattmeter’s input connector. Refer to Figure 17-1 as

necessary.

5. Connect a 50-ohm RF load/terminator to the wattmeter’s output connector.

6. At the rear of the LBPA, disconnect the antenna cable from the LBPA. If not labeled already, label

this antenna cable as the “LBPA Antenna” cable. This should be the cable from the lowest (vehicle

trunk lid-mounted) antenna.

7. Connect the other 50-ohm RF load/terminator to the LBPA (connector labeled “ANTENNA”). Use

the Type N female to TNC male RF adapter. Refer to Figure 17-1 as necessary.

8. Turn on the Unity XG-100M via the control head’s on/off volume control (or externally-mounted

switch).

IN OUT

Rear View of XG-100M

and XG-100LPA

DC Power

Cables

From 13.6-Volt Fused

Power Source

TNC Male-to-Type N Male

RF Coaxial Test Cable

CAN Cable and GPS

Antenna Cable connections

not are indicated.

Vehicle-Mounted

Antenna for

Multi-Band

(highest antenna)

Type N Male-to-

TNC Female

RF Adapter

Peak-

Reading

Wattmeter

50-Ohm RF Load/

Terminator

(“Dummy Load”)

Wattmeter

Element

(see text)

RADIO ANTENNA

Antenna’s

Coaxial

Cable

For XG-100M Multi-Band

coax cable connection is

made to MB ANT (TNC)

connector on rear of radio.

Vehicle-Mounted

Low Band Antenna

(lowest antenna)

50-Ohm RF Load/

Terminator

(“Dummy Load”)

Antenna’s

Coaxial

Cable

20 dB RF Attenuator

(Only Required for

50 and 110-Watt VHF Radios)

(For the 50 and 100-Watt VHF

Radios, see the Required Test

Equipment table for RF cable

requirements.)

Figure 17-1: Wattmeter Connections for Unity mobile MRU Antenna Tests