34
Transmit Deviation
Limit Alignment:
Reference Softpot
From the MAIN MENU, press F2 twice and then F6 to access this
screen.
Reference Attenuator Alignment is required after replacement or servicing of
the Controller Board or the RF Board. This alignment procedure limits the
modulation of the baseband signal. It is used for secondary
modulation limiting.
The reference frequency is displayed on the left side of the screen. The
reference softpot is displayed on the right side of the screen. A bar at
the bottom of the screen shows the current setting in relation to the
minimum and maximum settings.
Refer to the Radio Service Manual for the Transmit Deviation Limit
Alignment: Reference Softpot 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. Apply the appropriate signal according to instructions in your
Radio Service Manual.
3. While transmitting, modify the Reference Attenuator setting using
the UP/DOWN arrow keys. To increase the adjustment speed, use
the Shift-UP/DOWN arrow keys.
4. A relative Tx power value will be displayed, but you must measure
the actual transmitter deviation from the service monitor.
5. Press F6 to de-key the radio and Tab to move between frequency
points.
6. Press F8 to save the new values.
BBF
MOTOROLA Radio Service Software Use<:or <SHIFT><<SHIFT>:keys to change
HT/JT1000/VISAR Model: and <ENTER> to go to next softpot.
Serial:
SERVICE:XMIT ALIGN:XMIT DEV LIM REF
Transmit Deviation Limit Alignment: Reference Softpot
----------------------------------------------------
Test Current Value New Softpot Value
Frequency Channel Spacing Channel Spacing
12.5 kHz 20 kHz 12.5 kHz 20 kHz
177.97500 87 114 87 114
0 127
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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