Transmit Signalling: Mdc-1200 - Motorola MCS 2000 User Manual

Transmit Signalling:
MDC-1200
BDD
Programming Procedure
Function Key Descriptions
F6 - TOGGLE PTT
F8 - PROGRAM VALUE
66
From the MAIN MENU, press F2 and then F4 twice to access the DTMF
TRANSMIT SIGNALLING: MDC 1200 screen.
MOTOROLA Radio Service Software
MCS Model:
...TRANSMIT SIGNALLING: MDC 1200
TRANSMIT SIGNALLING: MDC 1200
-----------------------------
Frequency Current Value
--------- -------------
136.01250 21
0
MIN |----+----+----+----+----+----+----+----X----+----+----+----| MAX
F1 F2 F3
HELP
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.
This procedure should be attempted only by qualified
!
service personnel. Failure to perform alignment
procedures properly may result in seriously degraded
Caution
radio or system performance.
Refer to your Radio Service Manual for the MDC Signalling Deviation
Alignment 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.
Alternately keys and de-keys the radio being serviced.
Programs the selected value into the radio.
Use UP/DOWN Arrows To Adjust Softpot.
New Softpot Value..... 21
Transmitter..Off
F4 F5 F6 F7
TOGGLE
PTT
31
F8 F9 F10
PROGRAM EXIT
VALUE