26
Reference
Frequency
Alignment
From the MAIN MENU, press F2 three times to bring up the
REFERENCE FREQUENCY ALIGNMENT screen.
Refer to your Radio Service Manual for details of the Reference
Frequency Alignment procedure. This function is used to read the
radio codeplug and access the reference oscillator softpot.
1. Press F6 at the TRANSMIT POWER screen to key up the radio. The
radio’s RF output must be terminated into a 50 ohm load. (A three-
minute time-out timer is enabled when the radio is keyed.) If an
error occurs, a pop-up message will appear to indicate the type of
error. (Appendix A lists computer-to-radio communication error
codes.)
2. The radio will transmit on the Test Mode 7 frequency. While it is
transmitting, adjust the reference oscillator to the frequency
displayed on the screen using the UP/DOWN arrow keys. Use the
Shift-UP/DOWN arrow keys to increase the adjustment speed.
Note: A relative TX power value will be displayed, but you must
measure the actual RF power from the frequency counter or the
service monitor.
3. Press F6 to de-key the radio and F8 to program the new value into
the radio.
Note: The radio internal circuitry must be at room temperature (25
+/- 3 degrees C; 77 +/- 5 degrees F) to properly center the adjustment.
In addition, the radio might be warm from transmitting or
operating at a loud audio setting for a long period of time. Turn
the radio off and let it cool thoroughly to room temperature
before setting the reference oscillator.
BBB
MOTOROLA Radio Service Software Use <: or <SHIFT><<SHIFT>:keys
HT/JT1000/VISAR Model: to change softpot.
Serial:
SERVICE:XMTR ALIGN:REF FREQ
REFERENCE FREQUENCY ALIGNMENT
-----------------------------
Test Current
Frequency Value
519.97500 100 New Softpot Value.....100
Transmitter..Off
0 215
MIN |----+----+----+----+----X----+----+----+----+----+----+----| MAX
F1 F2 F3 F4 F5 F6 F7 F8 F9 F10
HELP TOGGLE PROGRAM EXIT
PTT VALUE
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