Service Manual Part 1

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  
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In this Section, deviation settings are given first for wide band, followed by settings for
medium band in brackets ( ) and settings for narrow band in square brackets [ ].
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Connect a sinad meter across the speaker terminals.
Connect an on-channel RF signal generator to the antenna input terminal.
Disable any signalling control in T2010 or T2020 models by using the monitor
function. The control head  LED should now be active.
Reduce the signal generator output level to -127dBm, modulated to ±3kHz
(±2.4kHz) [±1.5kHz] deviation at 1kHz AF.
Increase the RF output level until the squelch gate just opens.
Check that the reading on the sinad meter is between 8 and 14dB.
Reduce the signal generator output and check that the squelch gate closes within
4dB of the original RF level.
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Set the signal generator output level to -47dBm, modulated to ±5kHz (±4kHz)
[±2.5kHz] deviation at 1kHz AF.
Replace the sinad meter with an audio millivoltmeter across the speaker termi-
nals.
Adjust the volume control to the onset of clipping.
Reduce the signal generator output level to -127dBm.
The fall in output is the ‘squelch ratio’, and this should be at least 70dB.