Specifications
Apply an additional 1000 Hz tone at 0 dBm.
Verify the output deviation of the transmitter is
3.75 kHz • 100 Hz. If necessary, adjust POT 7,
Compressor Gain Pot.
16. Disconnect the signal from the remote audio
receive ports (TB1201-2,5). Verify that indicator
L2 turns OFF.
17. Re-apply the 1000 Hz tone to the signal generator
(removed in step 14) and verify the repeater is now
repeating the 1000 Hz tone and 123.0 Hz Channel
Guard tone at 3.75 Hz deviation.
18. Disconnect the RF signal generator and verify that
only indicator L1 is ON (L1 and L3 for 900 Mhz
applications).
MASTR III Repeaters
The following adjustment information supplements the
basic repeater alignment instructions found in the MASTR
III maintenance or installation manuals.
1. Verify the CNI Software 344A3497 is installed
(refer to the GETC FIRMWARE INSTALLATION
section).
2. Verify the jumper wire has been installed between
TP102 and J18-2 on the GETC Logic Board (refer
to Figure 4 in the Logic Board Modification
section).
3. Verify the GETC DIP switches are properly set for
CNI operation (refer to Figure 11 in the DIP
SWITCH SETTING section).
4. Ensure the CNI GETC’s personality Channel
Guard Mapping has one Conventional Network
Channel Guard set for 123.0 Hz. (Refer to the
personality example, Figure 13, in the
Programming The Personality section.)
5. Verify the jumpers are properly installed as shown
in Table 2.
6. Turn ON the Station Power Supply and verify L1
on the GETC is turned ON. This confirms proper
operation of the modem
7. Apply an “on channel” RF signal, modulated with
a 123.0 Hz tone at 0.75 kHz deviation (0.6 kHz if
NASPAC). Verify that indicator L6 turns ON.
Verify the transmitter output deviation is 0.75 kHz
± 50 Hz (0.6 kHz if NASPAC). Adjust the CG
(Channel Guard) software pot if necessary.
8. Modulate the signal with an additional 1000 Hz
tone at 3.0 kHz of deviation(2.4 kHz if NASPAC).
Verify the transmitter output deviation is 3.75 kHz
± 100 Hz (3.0 kHz if NASPAC).
9. Remove the 1000 Hz tone from the signal
generator, but leave Channel Guard (123.0 Hz)
tone ON.
10. Apply a 2175 Hz tone at -30 dBm (25 mV rms) to
TB101-2,5 on the MIII T/R Shelf Interface Board.
Verify that indicator L2 turns ON. Apply an
additional 1000 Hz tone at -10 dBm (245 mV rms).
Verify the output deviation of the transmitter is
3.75 kHz ± 100 Hz (3.0 kHz if NASPAC). If
necessary, adjust the deviation using the DI (DSP
Line Input) software pot.
11. Disconnect the signal TB101-2,5. Verify that
indicator L2 turns OFF.
12. Disconnect the RF signal generator and verify that
only indicator L1 is ON.
TROUBLESHOOTING
Refer to the Troubleshooting Chart in Figure 14 as a
guide for troubleshooting the CNI configuration. In
addition, the following steps provide additional help in
isolating problem areas while troubleshooting.
1. Check the CNI’s Personality. Verify the following
is correct:
• Channel Frequency
• Group ID and Channel Guard Frequency pairs
are correct.
• Repeater’s Logical ID
• Site ID
2. Check the Conventional Repeater. Verify that:
• Limited Channel Guard signal appears at TP 102.
• Channel Guard encode signal appears at J19-5.
3. Check CEC/IMC Data connections:
• CEC/IMC Data connections consist of 2 pairs of
9600 Baud links. Make sure they are correctly
connected. Refer CEC/IMC manual LBI-38662.
LBI-38986
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