Maxon Telecom SP210 - Manual (Page 21)

SP200/210 Maxon SP200/210 Radio
Issue 1.0 INSTALLATION, COMMISSIONING & ALIGNMENT
03/01 Page 4-7
g. Check that the signal generator RF
level is < -117dBm (UHF) or
< -118dBm (VHF).
Squelch
a. Ensure that both the radio and the
Test Set are set to the
appropriate channel spacing.
b. With the above setting, reduce the RF
level to –130dBm. The radio should be
mute.
c. Adjust the RF level until the SINAD
meter reads 10dB. The radio should
unmute. (Note: it will be necessary to
press and hold the monitor button to read
< 10dB SINAD).
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 accessories socket on the
radio, via the test box.
c. Adjust the volume control on the radio
under test to maximum (fully clockwise).
The voltmeter should indicate >= 1.55V.
The audio power meter should read
>= 300mW.
d. Decrease the volume control on the radio
so that the voltmeter reads 1.0V. Check
that the audio distortion is <5%.
Note: The audio power meter should be set to
8
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.
4.4 Power Adjustment
Note: Any power adjustments made should be
within R&TTE parameters.
Transmit periods longer than 5 minutes are to
be avoided.
Power setting potentiometers are located
underneath the upper label on the back of
the radio. A replacement label is shipped
with every radio.
This section is included here as it is not
necessary to disassemble the radio in order to
set the power output.
A stable power source is required and
therefore the ACC-2003 Interface Box should
be used as this contains a battery eliminator.
For squelch adjustments, see Section 4.5.6.
Power Squelch
High
Low 20/25kHz
12.5kHz
Figure 4-9 - Back Panel Adjusters
a. Select a mid-frequency channel with
High Power.
b. Set the PTT switch to on.
c. Adjust RV1 (High) to give 5W
±
0.1W.
d. Set the PTT switch to off.
e. Select a mid-frequency channel with
Low Power.
f. Set the PTT switch to on.
g. Adjust RV3 (Low) to give 1W
±
0.1W.
h. Set the PTT switch to off.
i. Repeat steps a to h until switching
between the two channels gives Low
Power of 1W and High Power of 5W.
j. Switch to a low frequency, low power
channel.
k. Set the PTT switch to on.
l. Check that the power output is
1W
±
1.5dB (0.7 to 1.41W).
m. Set the PTT switch to off.
n. Repeat steps k to m for a low power,
high frequency channel.