
The clearance transmitter shall be switched off.
Switch off the modulation to the transmitter used for the test.
Insert a 20 dB attenuator at the input port of the directional coupler.
Connect a test cable from the Cabinet’s CSB BNC connector to the 20 dB attenuator.
Connect the vector voltmeter A-probe to the directional coupler’s forward output.
8.7.2
Procedure
1. Connect the cable TEST SIG (throughput from the directional coupler) to the ADU CSB
input.
Connect the B-probe to L output. Note the B-probe RF level (dB). (0.1 dB resolution)
Move the B-probe to M output. If necessary adjust phaser D1 to obtain -6.0 dB difference
referenced to L output.
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2. Connect the cable TEST SIG to the SBO input. Connect the B-probe to U output. Note the
level.
Move the B-probe to the L output. If necessary adjust phaser D3 to obtain 0.0 dB difference
referenced to U output.
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3. Connect the B-probe to M output. Note the level.
Move the B-probe to L output.
If necessary adjust phaser D2 to obtain -6.0 dB difference referenced to M output.
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4. Connect the cable TEST SIG to the SBO input. Connect the B-probe to M output. Adjust
the vector voltmeter to 0° reference phase.
Move the TEST SIG cable to the CSB input. Check that the phase is 180° ±2°.
5. Connect the B-probe to L output. If necessary adjust LOWER ANT phaser (PH1) for 0°
phase.
Содержание NM 7000 Series
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