Service Manual Part 1
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Connect the T2000 antenna output via a 30dB attenuator to a modulation meter.
Plug the microphone test lead into the control head microphone input socket.
Apply a 1kHz sine wave and adjust the output level to give a 3kHz (2.4kHz)
[1.5kHz] deviation reading on the modulation meter.
Connect a millivoltmeter across the input of the microphone test box and check
for a reading of approximately 1mVrms on the millivoltmeter.
The audio processor gain must be checked at a level below that at which the
audio ALC or limiting are influencing the measurements.
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Connect the T2000 antenna output via a 30dB attenuator to a modulation meter.
Plug the microphone test lead into the control head microphone input socket.
Apply a 1kHz sine wave and increase the output level to 20dB above the limiting
level, as described in Section 4.5.1.1.
Vary the frequency of the sine wave generator between 0.3 and 5kHz.
Note the reading on the modulation meter.
The deviation should not exceed ±5kHz (±4kHz) [±2.5kHz].
Between 450Hz and 3kHz (3kHz) [2.55kHz] the deviation should be within 4dB of
maximum.
Above 3kHz the deviation should decrease by more than 25dB/octave.
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Decrease the sine wave generator output level to 10dB below the limiting level, as
described in Section 4.5.1.1.
Sweep the sine wave from 0.3 to 10kHz.
Note the reading on the modulation meter.
From 300Hz to 3kHz (3kHz) [2.55kHz] the deviation should increase at the rate of
6dB/octave (+1, -3dB) relative to 1kHz.
Above 3kHz the deviation should decrease by more than 25dB/octave.