March, 2001
6864110R66-O
5-3
CDR500 & CDR700 Repeater Service Manual
Tuning the Duplexer and Repeater Operational Tests
Operational Tests
the chassis back panel of the repeater to the
appropriate ports of the duplexer.
5.
Connect the handset output of the receive
radio (available through the front panel
microphone connector on pin #8 and ground
on pin #4) to the SINAD input of the CSA.
Initial Settings for the Test Equipment
1.
Refer to your operating manual for the CSA to
determine the correct control and switch settings.
2.
Select the DUPLEX MONITOR mode (or
equivalent) of the CSA and set the duplex
generator for the appropriate T/R spacing
(“DPLX OFFSET”).
3.
Adjust the modulation of a 1 kHz tone on the
duplex generator for 60% of rated system
deviation.
Measure the Repeater Desensitization
1.
Select the “DVM/DIST” (or equivalent) mode
of operation to allow measuring SINAD.
2.
Select the “MONITOR” (or equivalent) mode
of operation.
3.
Disable the repeater (method depends upon
which repeater controller is used). Adjust the
level of the duplex generator until 12 dBS sen-
sitivity is reached.
NOTE
If the receive radio mutes at or before
attaining 12 dBS, place the radio in the
“Volume Set” mode. This may require
reprogramming one of the buttons of the
radio.
4.
Increase the RF output of the duplex genera-
tor by 1 dB (this increases the SINAD).
5.
Enable the repeater (method depends upon
which repeater controller is used). The trans-
mit radio keys.
6.
Read the SINAD level. It should not drop
below 12 dB. If the SINAD is less than 12 dB,
check the tightness of connectors and the tun-
ing of the duplexer.
Repeater Deviation
1.
Select the “MONITOR” (or equivalent) mode
of operation.
2.
Disable the repeater (method depends upon
which repeater controller is used). Adjust the
duplex generator level for a strong (full “qui-
eting”) signal into the receive radio.
3.
Enable the repeater (method depends upon
which repeater controller is used). The trans-
mit radio keys.
4.
Read the transmitter deviation. It should be
within
±
10% of the deviation of the duplex
generator.
NOTE
If the transmit radio or the repeater con-
troller has been programmed to generate
TPL/DPL, the deviation of the TPL/DPL
will add to the 1 kHz tone deviation.
Measure Repeater Transmitter Output
Power
1.
Follow steps 1 and 2 under “Repeater Deviation”.
2.
Enable the repeater (“RPT EN” LED ON). The
transmitter keys “TX” LED ON).
3.
Read the transmitter RF power output from
the duplexer. Determine the maximum rated
insertion loss for your duplexer and the loss of
all cables. Use the following table as a guide.
Channel Spacing
60% Deviation
12.5/15 kHz
1.5 kHz
20/25/30 kHz
3.0 kHz
Channel Spacing
Minimum
Maximum
12.5/15 kHz
1.35 kHz
1.65 kHz
20/25/30 kHz
2.70 kHz
3.30 kHz
Rated
Power
1 dB Loss
2 dB Loss
3 dB Loss
45 W
36 W
28 W
22 W
40 W
32 W
25 W
20 W
25 W
20 W
16 W
13 W
10 W
8 W
6 W
5 W
Содержание CDR500
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