Audio Output Level
1. Increase the RF signal generator output level to 7uV (-90dBm) and add a 100Hz CTCSS Tone at +/- 450Hz deviation.
The SINAD reading should be close to 20 dB or so. Connect an oscilloscope to the AUDIO OUT (pin 5) on the
modular jack. The SINAD meter is already connected to this point.
2. Adjust R330 (SPEAKER AUDIO LEVEL) for the desired output level of the 1kHz tone.
3. Connect the oscilloscope to pin 7 of U300 and adjust R387 for a symmetrical 100Hz square wave.
Repeat Audio Level
1. For this adjustment, the service monitor must be able to generate an RF signal and simultaneously demodulate an
incoming RF signal.
2. Set the RF signal generator for the correct receive frequency with 1.5 kHz deviation of a 1 kHz tone and modulated
with the correct tone/code, if used. The RF output level should be set for 7uV (-90dBm) The demodulator should be
set to display deviation.
Summary of Contents for Liberty RLR-460
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