(Vhf/Uhf Only, Vco Crossover Frequency Tune) - Motorola Handie-Talkie MTX Series Theory/Troubleshooting Manual

(VHF/UHF Only, VCO Crossover Frequency Tune)

Replace C240 or C223
VHF
C240(RX)
3.0
C223(TX)
2.7
*
A complete part description and
Motorola part number for ordering
is located in the service manual.
TROUBLESHOOTING FLOW CHART #9
VCO-VEE Crossover
Freq. Tune Procedure
Program Radio to
Low Band Edge
136 MHz (VHF)
403 MHz (UHF1)
450 MHz (UHF2)
*
UHF1 UHF2
NO
2.7
2.7
2.4
2.7
Program Radio to
High Band Edge
178 MHz (VHF)
470 MHz (UHF1)
520 MHz (UHF2)
Enable -VEEE
Crossover Point
Tune Mode w/RSS
Program the New
Crossover Frequency
into the Codeplug
Is
VCTRL (TP5)
>3.0V?
YES
Is
YES
VCTRL
>11.0V?
NO
Is
VCTRL
NO
2.5V to 3.5V?
YES
*
Replace C240 or C223
UHF1
VHF
C240(RX) 2.0
2.4
C223(TX) 1.6
2.0
Use Up/Down Buttons
to Tune Crossover
Frequency w/RSS
MAEPF-23274-A
UHF2
2.0
2.0