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Transmit Signalling:
MDC-1200
From the MAIN MENU, press F2 and then F4 twice to access the DTMF
TRANSMIT SIGNALLING: MDC 1200 screen.
MDC deviation should be checked any time the radio is serviced and must
be adjusted whenever any of the modulation circuitry has been replaced. It is
also required following Modulation balance and Modulation Limit (VCO or
Reference) alignments. This alignment procedure limits the modulation
of a MDC-1200 signal.
Note: All radio compensation/deviation adjustments must be
made before adjusting MDC deviation.
Refer to your Radio Service Manual for the MDC Signalling Deviation
Alignment procedure.
Programming Procedure 1. Press F6 to key up the radio. (The radio’s RF output must be
terminated into a 50 ohm load.)
2. While transmitting, modify the High Speed Attenuator setting
using the UP/DOWN arrow keys.
3. Measure the actual Tx deviation with a service monitor.
4. Press F6 to de-key the radio.
5. Press F8 to save the new values.
Function Key Descriptions
F6 - TOGGLE PTT Alternately keys and de-keys the radio being serviced.
F8 - PROGRAM VALUE Programs the selected value into the radio.
BDD
MOTOROLA Radio Service Software Use UP/DOWN Arrows To Adjust Softpot.
MCS Model:
...TRANSMIT SIGNALLING: MDC 1200
TRANSMIT SIGNALLING: MDC 1200
-----------------------------
Frequency Current Value
--------- -------------
136.01250 21 New Softpot Value..... 21
Transmitter..Off
0 31
MIN |----+----+----+----+----+----+----+----X----+----+----+----| MAX
F1 F2 F3 F4 F5 F6 F7 F8 F9 F10
HELP TOGGLE PROGRAM EXIT
PTT VALUE
!
Caution
This procedure should be attempted only by qualified
service personnel. Failure to perform alignment
procedures properly may result in seriously degraded
radio or system performance.
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