Vertex Standard VX-450 series, Руководство по обслуживанию

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38 VX-450 Series UHF Band Service Manual
Alignment
Please adjust the following items when needed.
M
ODULATION
B
ALANCE
<W
IDE
> / <N
ARROW
> (T
HIS
A
LIGNMENT IS DIFFICULT
.)
This parameter is to align the “Modulation Balance” (Wide/Narrow).
It needs the appropriate JIG (Tuning Interface BOX). Connect the JIG and Test Equipment to the radio before
the alignment is started.
1. Press the “Mod Bal (W / N)” button to start the
alignment.
2. The Modulation Balance Alignment window will
appear.
3. Connect the Generator, Inject a 400Hz tone / Sine
Wave / -10 dBm to the MIC jack.
4. Click the left mouse button on the slide bar or
press the Up / Down arrow key, to select the de-
sired channel.
5. Click the “PTT” button or press the “SPACE” bar
the radio starts to transmit on the selected chan-
nel.
6. Set the value to get “the best square wave” on the
Oscilloscope by dragging the slide bar, clicking
the up-down button, pressing the left or right ar-
row key, or entering the value in the entry box on
the selected channel.
7. After getting the “the best square wave” click the
“PTT” button or press the “SPACE” bar to stop
transmitting.
8. Click the “OK” button to finish the Modulation
Balance alignment and save the data.
ADJ Type
Basic
: “Low-edge / band center / high-edge“
and select the channel for alignment
(Default).
Single : Alignment value changes only on the
selected channel.
All Freq : Alignment value changes on all chan-
nels.
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