Vertex Standard VX-6000U Service Manual page 23

Alignment
Before beginning, connect the transceiver and PC
using the CT-71 programming cable, 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 the audio output line to
ground, and be certain that the speaker has
adequate capability 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
below, when conducting receiver align-
ment steps.
3.5 PLUG
2-ohm
10W
2-ohm
10W
(4-ohm Dummy Load)
Alignment Channel Frequencies
Frequency
Channel
(simplex)
CH1 450.01 MHz
CH2 465.01 MHz
CH3 479.99 MHz
CH4 450.01 MHz
CH5 465.01 MHz
CH6 479.99 MHz
CH7 465.01 MHz
CH8 465.01 MHz
CH9 465.01 MHz
CH10 465.01 MHz
5-2
Attenuated
Test Output(1/2)
GND
470uF
CTCSS DCS
Narrow/Wide
Encode Encode
None None Wide
None None Wide
None None Wide
None None Narrow
None None Narrow
None None Narrow
151.4 Hz None Wide
None 023 Wide
151.4 Hz None Narrow
None 023 Narrow
PLL & Transmitter
Set up the test equipment as shown for transmit-
ter alignment.
Maintain the supply voltage at 13.4 V DC for all
steps.
Inline Wattmeter
RF Sampling
Deviation Meter
Coupler
CT-71 connection
Cable
Frequency
Counter
PLL VCV
Connect the positive lead of the DC voltmeter to
test point TP1008 (VCV) on the Main Unit, as in-
dicated in the figure, and connect the negative
lead to chassis ground.
Set the transceiver to the low band edge fre-
quency channel (CH1 or CH4), then adjust
TC1001 on the Main Unit for 1.5 ± 0.05 V on the
voltmeter.
Key the transmitter, and adjust L1019 on the
Main Unit for 1.6 ~ 1.7 V on the voltmeter.
Next select to the high edge frequency channel
(CH3 or CH6) and confirm the VCV is less than
7.0 V on the voltmeter.
Key the transmitter, and confirm the VCV is less
than 7.0 V on the voltmeter.
RF Signal
Generator
Transceiver
Power Supply
P C
13.8V DC
COM port