5-2
VX-4000 UHF Service Manual
Alignment
UHF TYPE F
Channel Frequency
CTCSS
DCS
Narrow/wide
(simplex)
Encode
Encode
CH1
480.01 MHz
None
None
Wide
CH2
496.01 MHz
None
None
Wide
CH3
511.99 MHz
None
None
Wide
CH4
480.01 MHz
None
None
Narrow
CH5
496.01 MHz
None
None
Narrow
CH6
511.99 MHz
None
None
Narrow
CH7
496.01 MHz
151.4 Hz
None
Wide
CH8
496.01 MHz
None
023
Wide
CH9
496.01 MHz
151.4 Hz
None
Narrow
CH10 496.01 MHz
None
023
Narrow
PLL & Transmitter
Set up the test equipment as shown for transmit-
ter alignment.
Maintain the supply voltage at 13.8 V DC for all
steps.
Before beginning, connect the transceiver and PC
using the CT-71 programming cable as described in
the EEPROM Programming chapter, and download
the EEPROM data from the transceiver to the com-
puter.
Store this data in a disk file so that it can be saved
and retrieved later. Using the table below, program
the channel, CTCSS, and DCS alignment settings for
your transceiver version. Upload this file to the
transceiver.
Note
:Signal levels in dB referred to in this proce-
dure are based on 0 dBµ = 0.5 µV (closed cir-
cuit).
Caution:
Do not connect this line to ground, and be
certain that the speaker has adequate ca-
pability to handle the audio output from
the radio.
Because of the bridge audio amplifier cir-
cuit used in the radio, it is necessary to con-
struct and use a simple audio load test
adapter as shown in the schematic diagram
above, when conducting receiver align-
ment steps.
Alignment Channel Frequencies
UHF TYPE A
Channel Frequency
CTCSS
DCS
Narrow/wide
(simplex)
Encode
Encode
CH1
400.01 MHz
None
None
Wide
CH2
415.01 MHz
None
None
Wide
CH3
429.99 MHz
None
None
Wide
CH4
400.01 MHz
None
None
Narrow
CH5
415.01 MHz
None
None
Narrow
CH6
429.99 MHz
None
None
Narrow
CH7
415.01 MHz
151.4 Hz
None
Wide
CH8
415.01 MHz
None
023
Wide
CH9
415.01 MHz
151.4 Hz
None
Narrow
CH10 415.01 MHz
None
023
Narrow
UHF TYPE D
Channel Frequency
CTCSS
DCS
Narrow/wide
(simplex)
Encode
Encode
CH1
450.01 MHz
None
None
Wide
CH2
465.01MHz
None
None
Wide
CH3
479.99 MHz
None
None
Wide
CH4
450.01 MHz
None
None
Narrow
CH5
465.01 MHz
None
None
Narrow
CH6
479.99 MHz
None
None
Narrow
CH7
465.01 MHz
151.4 Hz
None
Wide
CH8
465.01 MHz
None
023
Wide
CH9
465.01 MHz
151.4 Hz
None
Narrow
CH10 465.01 MHz
None
023
Narrow
PLL VCV
r
Connect the positive lead of the DC voltmeter to
the test point
TP1007
(VCV) on the Main Unit,
as indicated in the figure, and the negative lead
to chassis ground.
r
Set the transceiver to the high band edge fre-
quency channel, then adjust
L1016
on the Unit
for 4.2 V on the voltmeter.
r
Key the transmitter, and adjust
L1017
on the Unit
for 4.2 V on the voltmeter.
r
Next select to the low edge frequency channel
and confirm 1.0 V on the voltmeter.
r
Key the transmitter, and confirm 1.0 V on the volt-
meter.
PLL Reference Frequency
With the wattmeter, dummy load and frequency
counter connected to the antenna jack, and select
band center frequency channel, key the transmitter
(Low power level) and adjust
TC1001
on the Main
Unit, if necessary, so the counter frequency is with-
50-Ohm
Dummy Load
Inline Wattmeter
Deviation Meter
Frequency
Counter
RF Sampling
Coupler
RF Signal
Generator
Transceiver
Power Supply
13.8V DC
CT-71 connection
Cable
PC
COM port