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TB8100 Service Manual Reciter Fault Finding 87

If the reciter’s performance meets all these specifications, go to Task 3.

If the deviation is incorrect, go to Task 4

. If the RF output power is

incorrect, return the complete reciter to your nearest CSO for repair

or replacement. If the output frequency is incorrect, adjust the car-

rier frequency offset using the Calibration Kit and repeat the test. If

the output frequency is still incorrect, return the complete reciter to

your nearest CSO for repair or replacement.

Task 3 —

Check Deviation

(as Line Controlled

Base Station)

1. Use the Service Kit to disable the reciter’s talk through functionality.

(Select Configure > Base Station > Channel Profiles. In the Edit

Channel Profile screen, go to the Signal Path tab.)

2. Inject an audio test signal into the LINE INPUT on the CTU. Set

the signal level to the level configured in the channel profile.

3. Put the reciter in Run Mode and set the TX KEY switch on the

CTU to ON.

4. Check that the deviation of the exciter is as follows:

■ narrow bandwidth 1.5kHz ±125Hz

■ mid bandwidth

2.4kHz ±200Hz

■ wide bandwidth 3kHz ±250Hz

Note The deviation will depend on the bandwidth of the currently

selected channel. You do not have to test the other bandwidth(s)

available.

5. If the deviation is correct, go to “Audio” on page 89. If it is not, go

to Task 4

1. H band only.

Tait TB8100 Service Manual

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