User's Manual

An audio oscillator should be connected to the AUX IN input. The output waveform should be sine, the
level at zero, and at a frequency of 500 Hz. Confirm that the Aux In Gain value is at least 10.
On the channel drop-down menu, select lower band edge. Activate the PTT, and while observing the
demodulated waveform on the oscilloscope, begin increasing the audio oscillator’s output level or the Aux
In setting. The waveform should begin as a sinewave and at some point show clipping. The clipped
portion may not necessarily be flat. The audio oscillator level should be set so that a substantial portion of
the waveform is clipped, at least 50 %. Adjust the balance value so that the clipped portion is flat i.e.
horizontal rather than tilted. Although the programmer can change values while transmitting, it is better to
unkey between value entries. After the balance is set, the deviation should be set to a value of 1.2 kHz for a
very narrow channel, 2.3 kHz for a 12.5 kHz channel or 4.6 kHz for a 25/30 kHz channel. Select the upper
band edge on the channel menu and repeat. As a result of this procedure, the per channel balance and
deviation values may have changed.