ALIGNMENT PROCEDURE
6-7
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 communica-
tion monitor.
Transmit Frequency
2. Monitor the transmit frequency and at room temper-
ature it should ±100 Hz. At other temperatures (–30
to +60° C), it must be within 2.5 PPM (VHF/UHF)
or 1.5 PPM (800 MHz). 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.
VHF Standard - 10-50 watts
VHF 100W - 50-100 watts
UHF 15W - 7-15 watts
UHF 40W - 10-40 watts
800 MHz - 10-35 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
800 MHz NPSPAC Channels - 2.5 kHz
5. Select a channel programmed with Call Guard
(CTCSS/DCS) signaling. Maximum total Call
Guard and voice modulation should be approxi-
mately as follows:
12.5 kHz Channels - 2.3 kHz
25 kHz Channels - 4.7 kHz
800 MHz NPSPAC Channels - 3.8 kHz
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