Maxon SP-1102, Руководство по обслуживанию, Страница: 14 / 35

Service Manual SP - 1402
Page 14 of 35
f) Release PTT.
When CTCSS and DCS performance checks are also required, ensure that the lowest,
middle and highest RX/TX frequencies include: (see below for suggested test channel set-
up).
Lowest RX/TX freq. ch. 67.0 Hz CTCSS
Middle RX/TX freq. ch DCS Code 023
Highest RX/TX freq. ch 250.3 Hz CTCSS
The middle RX/TX frequencies should be halfway between the lowest and the highest
frequencies.
Receiver Performance Tests
Sensitivity
Set the radio to the correct channel.
SINAD performance test is used to test the sensitivity of the radio receiver.
Select the required frequency to be measured (without CTCSS enabled)
a) Connect the RF signal generator, modulated with a 1 kHz tone, to the radio.
b) Set the frequency of the RF signal generator, to correspond with to the RX frequency of
selected channel
c) Connect the SINAD voltmeter to the external speaker socket on the radio. Ensure that
the radio has been programmed to path the audio to the external accessory socket.
d) If signal is not present press the monitor button. Set the volume control to mid-range.
e) Set the RF signal generator deviation to:
12.5 kHz channel spacing 1.5 kHz dev
25 kHz channel spacing 3kHz dev
f) Adjust the RF signal generator level until the SINAD meter reads 12dB.
g) Check that the signal generator
RF level is < -117dBm (0.31µVpd).