Maxon SM5102Radio
When CTCSS and DCS performance checks
are also required, ensure that the lowest,
middle and highest Rx/Tx frequencies
include:
Lowest Rx/Tx freq. ch. 67.0 Hz CTCSS
Middle Rx/Tx freq. ch. DCS Code 072
Highest Rx/Tx freq. ch. 250.3 Hz CTCSS
The middle Rx/Tx frequencies should be
halfway between the lowest and the highest
frequencies.
2.1.3 Receiver Performance Tests
Sensitivity
The SINAD performance test may be used to
test the sensitivity of the receiver.
a. Connect the RF signal generator,
modulated with a 1kHz tone, to the
radio.
b. Set the frequency to correspond to the
Rx frequency of one of the channels
programmed into the radio.
c. Connect the SINAD voltmeter to the
external speaker socket on the radio.
d. Press the monitor button and set the
volume control to mid-range.
e. Set the RF signal generator deviation
to:
12.5kHz channel spacing 1.5kHz dev.
20kHz channel spacing
2.4kHz dev.
25kHz 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 (0.31
µ
Vpd).
Squelch
a. Ensure that both the radio and the
signal generator are set to the
appropriate channel spacing.
b. With the above setting, reduce the RF
level to –130dBm. The radio should be
mute. It may be necessary to press the
monitor button to achieve mute.
c. Adjust the RF level until the SINAD
meter reads 10dB. The radio should
unmute.
Audio Output
a. Set the RF signal generator to 1mV pd
(-47.0dBm) and the tone and deviation
as above.
b. Connect the audio power meter to the
external speaker socket on the
radio.
c. Adjust the volume control on the radio
under test to maximum (fully clockwise).
The voltmeter should indicate >= 3.5V.
The audio power meter should read
>= 3W.
Note: The audio power meter should be set
to 16
Ω
.
This concludes the Performance Tests.
If the Radio should fail any of these tests it
will be necessary to turn to the next section
on Alignment.
