Maxon Telecom SP210 - Manual (Page 27)

SP200/210 Maxon SP200/210 Radio
Issue 1.0 INSTALLATION, COMMISSIONING & ALIGNMENT
03/01 Page 4-13
Balance Adjustment
a. Select Channel 3 (using software).
b. Set the audio generator to a 310Hz tone,
low output impedance, at a level of
400mV.
c. Press Shift + T on the keyboard to
transmit.
d. Adjust TXTRIM2/TXTRIM3 to give a
square wave on the oscilloscope
(check that audio enable is ON on the
Interface Box.
e. Press Shift + R to turn off the transmitter.
Audio deviation adjustment
a. Select Channel 3 and press Shift + T to
turn on the transmitter.
b. Set the audio generator to 1kHz and
adjust its level for 60% peak system
deviation. Ensure that, depending upon
the channel spacing of channel 3, the
deviation is either:
12.5kHz channel spacing 1.5kHz dev.
or 20kHz channel spacing2.4kHz dev.
or 25kHz channel spacing3kHz dev.
c. Measure the audio distortion. This
should be less than 5%.
d. Increase the audio level by 20dB (10x
voltage).
e. Adjust TXTRIM1. to set the deviation to:
12.5kHz channel spacing 2.25kHz dev.
or 20kHz channel spacing3.6kHz dev.
or 25kHz channel spacing4.5kHz dev.
f. Slowly sweep the audio signal generator
between 300Hz and 3kHz. Record the
peak deviation. The peak deviation
should be:
12.5kHz channel spacing <= 2.5kHz dev.
or 20kHz channel spacing<= 4kHz dev.
or 25kHz channel spacing<= 5kHz dev.
If necessary, adjust TXTRIM1 to keep within
the system deviation.
g. Repeat para. f with the radio set to
Channel 1.
If necessary, adjust TXTRIM1 to keep within
the system deviation.
h. Press Shift + R to return to receive.
CTCSS / DCS deviation
a. Select Channel 4.
b. Turn off the audio signal generator so
that the RF signal generator is not
modulated.
c. Press Shift + T on the keyboard.
d. Adjust SATRIM2 for the desired CTCSS
tone peak deviation (
±
50Hz) which is:
12.5kHz channel spacing 0.25kHz dev.
or 20kHz channel spacing0.4kHz dev.
or 25kHz channel spacing0.5kHz dev.
e. Press Shift + R to return to receive.
f. Select Channel 5.
g. Press Shift + T and check that
the deviation is the same as above.
If the deviation is greater than above,
adjust SATTRIM2.
h. Press Shift + R to return to receive.
i. Select Channel 4.
j. Press Shift + T to transmit.
k. Turn the audio generator back on so that
the RF signal generator is modulated
with a 310Hz tone.
12.5kHz channel spacing 2.5kHz dev.
or 20kHz channel spacing4.0kHz dev.
or 25kHz channel spacing5.0kHz dev.
l. Press Shift + R to return to receive.
Select Channel 5 and press Shift + T.
Check that the peak deviation is less than:
12.5kHz channel spacing <= 2.5kHz dev.
or 20kHz channel spacing<= 4.0kHz dev.
or 25kHz channel spacing<= 5.0kHz dev.
If necessary, adjust TXTRIM to keep within the
system deviation.
m. Press Shift + R to return to receive.
n. Write the changes to the radio.