Ritron Liberty RLR-460, Manual

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2. Set R347 (TONE DEVIATION) to the full counterclockwise position to prevent any signaling tone from being
transmitted.
3. The RF output should be routed to an FM demodulator and the demodulated output made visible on an oscilloscope.
The filtering on the demodulator should be 15 kHz or higher on the lowpass filter and below 50 Hz on the highpass
filter. It is important that NO or MINIMUM highpass filtering be in place in the demodulation path.
4. While observing the oscilloscope, key the transmitter. Increase the audio generator level until the 500 Hz sinewave
becomes visible on the oscilloscope. Continue increasing the generator level until a significant amount of clipping on
the top and bottom of the sinewave is evident (typically 250 mVrms).
5. Carefully adjust R337 (BALANCE) so that the clipped portion of the observed waveform is flat i.e. not tilted up or
down.
6. Adjust R350 (VOICE DEVIATION) for +/- 2.35 kHz deviation.
7. Unkey the transmitter.