Vertex Standard VX-4000 Manual de servicio descargar pdf (Pagina 22)

5-2

2-ohm

10W

3.5 PLUG

2-ohm

10W

470uF

GND

Attenuated

Test Output(1/2)

(4-ohm Dummy Load)

Alignment

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.

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 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.

r Key the transmitter, and adjust L1019 on the

Main Unit for 1.6 ~ 1.7 V on the voltmeter.

r Next select to the high edge frequency channel

(CH3 or CH6) and confirm the VCV is less than

7.0 V on the voltmeter.

r Key the transmitter, and confirm the VCV is less

than 7.0 V on the voltmeter.

Alignment Channel Frequencies

Channel

Frequency CTCSS DCS

Narrow/Wide

(simplex) Encode Encode

CH1 450.01 MHz None None Wide

CH2 465.01 MHz 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

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

COM port

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 79 80

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Vertex Standard VX-4000 Manual de servicio Pagina 22

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