Vertex Standard VX-800, Руководство по обслуживанию

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19
Alignment
Whenever possible, alignments should be made with
oscillator shields and circuit boards firmly affixed
in place. Also, the test equipment must be thor-
oughly warmed up before beginning.
Note: Signal levels in dB referred to in the alignment
procedure are based on 0 dBµ EMF = 0.5 µV (closed cir-
cuit).
When connecting the CT-71 plug into the MIC/
SP jack of the VX-800, you must remove the
plastic cap and its mounting screws prior to
programming. Please remember to re-attach
the cap and screws when the programming is
complete.
Setup the test equipment as shown for transceiver
alignment, and apply 7.5V DC power to the trans-
ceiver. Refer to the drawings above for Alignment
Points.
The alignment mode is accessed by an "Alignment
mode" command from the computer while switch-
ing the transceiver on. And it is operated by the
alignment tool automatically.
During the alignment mode, normal operation is sus-
pended. Use the alignment tool program running
on PC.
The alignment tool outline
Installation of the Alignment Tool
This alignment tool consists of an executable file
“SVC31.exe” and an accompanying configuration
file “SVC31.cfg” which should be loaded per stan-
dard DOS procedures. Create a suitable directory,
then copy this file from the distribution diskette into
the new directory. For example, if copying the file
from Drive A, use the following DOS command se-
quence:
c:\ mkdir align800 [enter]
c:\ cd align800 [enter]
c:\align800\ copy a:SVC31.*
No further installation steps are required. If you wish
to utilize a different name for the alignment direc-
tory, it will not matter to the executable file.
Boot the Alignment Tool
Change to the “align800” directory (or the directory
name you utilized in the previous section). Now type
on the command line: SVC31 [
ENTER
] to boot the
alignment tool.
Entering the Alignment Mode
To enter the alignment mode, turn the transceiver
off, then press [
0
] on the computer keyboard. Now,
turn the transceiver back O
N
. When the command
has been successful, a message on the computer
screen will confirm that the transceiver is now in
the “Alignment” mode.
Action of the switches
When the transceiver is in alignment mode, the
[
PTT
], [
MON
], and [
DIAL
] switches, as well as the
Dial, are disabled. In the Alignment mode, all of the
transceiver’s operation is remotely controlled by PC.
Important Note
The transceiver must be programmed for use in the
intended system before alignment is attempted. The
RF parameters are loaded from the file during the
alignment process.
In order to facilitate alignment over the complete
switching range of the equipment it is recommended
that the channel data in the transceiver is preset as
the chart below.
50
Ω Ω Ω Ω Ω
Dummy Load
Inline
Wattmeter
Deviation Meter
Frequency
Counter
RF Sampling
Coupler
RF Signal
Generator
Transceiver
Power Supply
7.5V DC
CT-71 connection
Cable
PC
MIC/SP
COM port
Channels
Frequency (Simplex)
Ver. A Ver. CS Ver. D
Band-LOW
Band-MID
Band-HIGH
400.000 440.000 450.000
415.000 455.000 470.000
430.000 470.000 490.000