User Manual Part 2

3. Set the signal generator output level for 1000 µV (–47 dBm) at the antenna jack.

4. Decrease the signal generator output to obtain 12 dB SINAD. The signal generator output

should be 0.35 µV (–116 dBm) or less for 25 kHz channels, or 0.50 µV (–113 dBm) or

less for 12.5 kHz channels.

Audio Power Output and Distortion

5. Connect a distortion meter across the speaker load. Return the generator output to 1000

µV. Distortion should be 3% or less.

Squelch Sensitivity

6. Increase the signal generator output from zero and note the SINAD when unsquelching

occurs. It should be approximately 8 dB.

6.6.3 TRANSMITTER PERFORMANCE TESTS

1. Connect a wattmeter and dummy load to the antenna jack. Monitor the transmit signal

with a communication monitor.

Transmit Frequency

2. Monitor the transmit frequency and at room temperature it should ±100 Hz. At other

temperatures [–22° to +140° F (–30° to +60° C)], it must be within 2.5 PPM. This also

checks the receive frequency.

Transmit Power

3. Transmit power should be in the following ranges. High and low levels can be preset

anywhere in this range by PCTune. The factory default for high power is the maximum

shown below, and low power is half that value.

Standard Models -10-50 Watts

Transmit Modulation

4. Monitor the transmit modulation with a modulation meter. Speak into the microphone

with a normal voice. Modulation should be approximately as follows with no

CTCSS/DCS signaling present:

12.5 kHz Channels - 1.4 kHz

25 kHz Channels - 3.4 kHz