Service manual

CHANNEL RECEIVER VOTER MODULE (cRVM)
6-8
March 2000
Part No. 001-3139-502
c. Set Parameters as follows:
Display Entry/Encode Data = Encode Data
Repeater/Mobile = Mobile
Digital/Analog = Analog
Normal/Inverted = Normal
Encode/Decode = Encode
Enter the data as: System Key
UID HOME GID GOTO STA PRI R
d. Connect the IFR to the Repeater’s receive port.
e. Set the frequency to the Receive frequency.
f. Position the IFR to generate.
g. Check that the Data Level coming from the SED is
at 1 kHz deviation. (If the level is low or high,
adjust Data Out POT on the SED box.)
h. Set the IFR to generate a 1 kHz tone at:
1.5 kHz deviation at 800 MHz
1.33 kHz deviation at 900 MHz
1.2 kHz deviation NPSPAC.
6.10.3 RVM LEVEL ADJUSTMENTS
NOTE: The cRVM can compensate for some line loss/
gain discrepancies, however excessive line losses must
be considered. Leased line circuits may have loss/gain
that is not controllable at the Site and must be dealt
with by the carrier. The circuits should have been pre-
viously measured and tolerances taken into account.
1. Verify a -12 dBm audio level from the Receiver to
the Voter.
2. If the measured level is incorrect the cRVM EEPOT
must be adjusted (see Figure 6-5).
3. Set S2, sections 1 and 3 OFF, section 2 ON.
Set S2, section 4:
OFF to increase the output when pressing S1
ON to decrease the output when pressing S1
4. Press S1 to change the output level as close to
-12 dBm as possible.
5. Set S2, sections 1-4 OFF when the alignment is
completed.
NOTE: The cRVM should not be measured or adjusted
for 2-3 minutes after power up, if the receiver has been
turned off, or if levels have been changed on the receiv-
er or circuits. This allows time for the cRVM to self-
align to the Pilot Tone.
6. Continue with the above steps for ALL channels at
the first Site before continuing to other Sites.