TB7100 Installation and Operation Manual Preparation for Operation 87
© Tait Electronics Limited December 2005
Note If the measured value does not agree with the programmed set-
tings, the transmitter module is either faulty or needs recalibrating.
Maximum
Deviation
When measuring the maximum deviation, the audio input signal can be via
either the balanced or unbalanced audio input.
If CTCSS is to be added, this should be done before carrying out this test.
Refer to “Enabling Subaudible Signalling” on page 115 for instructions.
1. Set up the test set to measure the deviation of the RF signal.
2. Connect the audio output from the test set to the required CTU
audio input.
3. Set up the test set audio generator output to be 1kHz and at the
required level to produce 60% full system deviation (this is the level
used in the audio level adjustment section).
4. Activate the Tx Key switch and verify that the measured deviation is
60% of full system deviation.
5. Increase the test set audio generator output level by 20dB and sweep
the audio frequency from 100Hz to 4kHz.
6. The maximum measured deviation level should not exceed the full
system deviation programmed for the channel.
Note If the measured value exceeds the programmed settings, the trans-
mitter module is either faulty or needs recalibrating.
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