Vertex Standard VX-210AU, Service Manual

Page: 11 / 42

11
Alignment
The VX-210A has been carefully aligned at the factory for
the specified performance across the frequency range spec-
ified for each version. Re-alignment should therefore not
be necessary except in the event of component failure, or
altering version type. All component replacement and
service should only be performed by an authorized Ver-
tex representative, or the warranty policy may be void.
Required Test Equipment
m
CT-42 Programming Cable with CE45 Channel Pro-
gramming Diskette
m
RF Signal Generator with calibrated output level at
1GHz
m
Deviation Meter (Linear Detector)
m
AC Voltmeter
m
SINAD Meter
m
In-Line wattmeter with 5 % accuracy at 500 MHz
m
Regulated DC Power Supply adjustable from 4 to 10 V,
3 A
m
50-ohm Non-reactive Dummy Load: 10 W at 500 MHz
m
Frequency Counter: ±0.2 ppm accuracy at 500 MHz
m
AF Signal Generator
m
DC Voltmeter: high impedance
Before beginning alignment, connect the transceiver and
PC using the CT-42 Programming Cable, and run the CE45
Channel Programming Diskette, then download the EE-
PROM data from the transceiver to the computer. Then
store this data in a disk file so that it can be uploaded
when alignment is finished.
You should find the corresponding data file on the com-
puter disk for the transceiver version you are aligning, con-
taining channel settings for the high edge, middle and low
edge of the transceiver’s frequency range in channels 1, 2
and 3, respectively. Up-load this file to the transceiver.
Note: Signal levels in dB referred to in the alignment proce-
dure are based on 0 dBµ EMF= 0.5µV (closed circuit).
PLL & Transmitter
Set up the test equipment as shown for transmitter align-
ment. Adjust the supply voltage to 7.2 V for all steps where
not specified otherwise.
PLL VCV (Varactor Control Voltage)
r
Connect the DC voltmeter between
TP03
on the chip
side of the Main Unit and ground.
r
Set the transceiver to CH 3 (high band edge), and ad-
just
L1004
on the chip side of the Main Unit for 3.6 V
(±0.1 V) on the voltmeter.
r
Set the transceiver to CH 1 (low band edge), and con-
firm the low-end VCV is more than 0.8 V while trans-
mitting, and also while receiving.
L1004
TP03
50-ohm
Dummy Load
Inline Wattmeter
Deviation Meter
Frequency
Counter
RF Sampling
Coupler
RF Signal
Generator
Transceiver
Power Supply
7.2V DC
CT-42 connection
Cable
PC
MIC/SP
COM port
Channels Version D Version CS Version AS1
Low Band Edge (Channel 1) 450.000 MHz 440.000 MHz 400.000 MHz
Band Center (Channel 2) 470.000 MHz 455.000 MHz 415.000 MHz
High Band Edge (Channel 3) 490.000 MHz 470.000 MHz 430.000 MHz