Service manual

CHANNEL RECEIVER VOTER MODULE (cRVM)
6-7
March 2000
Part No. 001-3139-502
6.8.6 CHANNEL 4 AUDIO OUTPUT LEVEL
Remove the 1200 Hz tone from P1, pins 29 and
30. Connect the 1200 Hz tone to P1, pins 31 and 32.
Remove the jumper from J3 and place it onto just one
of the pins. LEDs CR5 and CR6 will turn off and the
RVM will be self-aligning Channel 4 to the on-board
reference tone. The self-alignment will take approxi-
mately 10 seconds.
When the self-alignment of U43 is complete, its
associated LEDs CR7 and CR8 will start flashing.
1. Connect the transmission test set to TP5 and verify
that U43 is -20 dBm ±2 dBm.
2. Connect the transmission test set to P1 pin 21, mea-
sured output should be -25 dBm.
6.9 RVM REPLACEMENT
The RVM alignment is complete.
1. Remove the RVM from the Extender Board and
remove the 1200 Hz from P1, pins 31 and 32.
2. Remove the jumper from J4 and place it onto just
one of the pins. (Removal of jumpers J6, J2-J4
places the RVM into normal operation.)
3. The LEDs CR7 and CR8 will turn off.
4. Return S2 to noted setting (Section 6.8.3, Step 3).
5. Set all other switches for the desired mode of
operation.
6. Replace the RVM in the Voter shelf.
7. Replace all external connections.
8. On the SMM, select the RVM and disable the
unused channel.
NOTE: To check output on pin 21, tear down the call
and let RVM adjust for two to three minutes before set-
ting (will not adjust during a call).
NOTE: To engage Sites on RVM, on the SMM use De-
vice Number of VDM connected to the shelf of the
RVM. Use cRVM number (S5, 1-5) for channel number,
RVM number is 0 (zero) if all are cRVMs.
6.10 INSTALLED SYSTEM ADJUSTMENTS
6.10.1 PRELIMINARY
This procedure is for a installed System that is
properly aligned and the audio levels from the
Receiver to the Voter are set:
• 800 MHz Repeaters:
-12 dBm at 1.5 kHz audio deviation less data
• 900 MHz Repeaters:
-12 dBm at 1.33 kHz audio deviation less data
NOTE: Personnel performing this alignment should be
familiar with the System wiring and Audio I/O
connections.
• The levels set in this procedure should be set on one
input channel for each cRVM output, all of the other
inputs self-align to the -20 dBm Pilot Tone.
• If more than 4 Sites are used per channel, this align-
ment must be performed on one input channel for
each cRVM and RVM.
• The level should be set from a "Master" Site or the
most accessible Site.
• Verify audio levels from the other Sites are set prop-
erly at the input to the cRVM. The output should
not vary more than a few tenths of a dB from each
associated Site.
6.10.2 ESTABLISH A MULTI-NET CALL
1. If the repeater is off, turn it on and wait 1-2 minutes
for the cRVM in the Voter to self-align before bring-
ing up a Multi-Net call.
2. Set an IFR to Transmit a Multi-Net call.
a. Connect a SED box to the Ext. Mod SINAD Port of
the IFR.
b. Power the SED box from the repeater IAC.