Vertex Standard VX-5500V, Руководство по обслуживанию

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5-2
Alignment
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, 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.
PLL VCV
r
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.
r
Set the transceiver to the high band edge fre-
quency channel (CH3 or CH6), then key the trans-
mitter, and adjust
L1026
on the Main Unit for 4.3
V ±0.1 V on the voltmeter.
r
Adjust
L1023
on the Main Unit for 4.3 V ±0.1 V
on the voltmeter.
r
Next select to the low edge frequency channel
(CH1 or CH4) and confirm the VCV is more than
1.0 V on the voltmeter.
r
Key the transmitter, and confirm the VCV is more
than 1.0 V on the voltmeter.
PLL Reference Frequency
With the wattmeter, dummy load and frequency
counter connected to the antenna jack, and select
band center frequency channel (CH2 or CH5), key
the transmitter and adjust
VR1001
on the Main Unit,
if necessary, so the counter frequency is within 100
Hz of the channel center frequency for the trans-
ceiver version.
Alignment Channel Frequencies
Channel
Frequency CTCSS DCS
Narrow/Wide
(simplex) Encode Encode
CH1 148.01 MHz None None Wide
CH2 161.01 MHz None None Wide
CH3 173.99 MHz None None Wide
CH4 148.01 MHz None None Narrow
CH5 161.01 MHz None None Narrow
CH6 173.99 MHz None None Narrow
CH7 161.01 MHz 151.4 Hz None Wide
CH8 161.01 MHz None 023 Wide
CH9 161.01 MHz 151.4 Hz None Narrow
CH10 161.01 MHz None 023 Narrow
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
2-ohm
10W
3.5 PLUG
2-ohm
10W 470uF
GND
Attenuated
Test Output(1/2)
(4-ohm Dummy Load)
AF Test Adapter Schematic