User's Manual

2. Set R347 (TONE DEVIATION) to the full counterclockwise position.
3. To RF output should be routed to an FM demodulator and the demodulated output made viable 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.
4. While observing the oscilloscope, key the transmitter. Increase the audio generator level until the 500
Hz sinewave becomes viable on the oscilloscope. Increase the generator level until a significant
amount of clipping on the top and bottom of the sinewave is evident.
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.
6.4.4 Transmitter Frequency Trim
1. Remove the audio generator connection.
2. Key the transmitter and note the frequency of the RF output signal. Adjust R339 (TX FREQ TRIM)
for the correct transmit frequency +/- 100 Hz.
Unkey the transmitter.
6.4.5 Tone Deviation
1. Key the transmitter and adjust R347 (TONE DEVIATION) for the desired tone/code deviation,
typically 350 Hz.
2. Unkey the transmitter.
6.4.6 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 7 uV (-90
dBm) The demodulator should be set to display deviation.
3. The transmitter should automatically key (red LED illuminated). Adjust R328 (REPEAT AUDIO
LEVEL) for +/- 1.5 kHz deviation.
4. Reduce the RF signal generator level to minimum to unkey the transmitter.
6.5 INTERNAL REGULATOR OPTIONS
An internal voltage regulator exists in the RLR-460 repeater to regulate the DC input voltage to that
required by the transmitter stages. If a regulated power supply is available, this internal regulator may be
bypassed. Bypassing the internal regulator allows for a higher RF output power. A more complete
description of the regulator options follows: