65
Transmit
Signalling: High
Speed
From the MAIN MENU, press F2, F4 and then F3 to access the
TRANSMIT SIGNALLING: HIGH SPEED screen.
Transmit Signalling: High Speed should be checked any time the radio is
serviced and must be adjusted whenever any of the modulation circuitry is
replaced. It is also required following Modulation balance and Modulation
Limit (VCO or Reference) alignments. This alignment procedure limits
the modulation of the Trunking: High Speed signal.
Refer to your Radio Service Manual for the Transmit Signalling: High
Speed 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 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.
Field Definitions
New Softpot Value This is the working High Speed Attenuator value. The status bar shows
the relationship between this setting and the minimum and
maximum settings.
BDC
MOTOROLA Radio Service Software Use UP/DOWN Arrows To Adjust Softpot.
MCS Model:
...TRANSMIT SIGNALLING: HIGH SPEED
TRANSMIT SIGNALLING: HIGH SPEED
-------------------------------
Frequency Current Value
--------- -------------
136.01250 17 New Softpot Value..... 17
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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