18VX-450 Series VHF Band Service Manual
Alignment
Introduction
The VX-450 series is carefully aligned at the factory
for the specified performance across the frequency
range specified for each version. Realignment should
therefore not be necessary except in the event of a
component failure, or altering version type. All com-
ponent replacement and service should be per-
formed only by an authorized Vertex Standard rep-
resentative, or the warranty policy may be void.
The following procedures cover the sometimes crit-
ical and tedious adjustments that are not normally
required once the transceiver has left the factory.
However, if damage occurs and some parts subse-
quently are replaced, realignment may be required.
If a sudden problem occurs during normal opera-
tion, it is likely due to component failure; realign-
ment should not be done until after the faulty com-
ponent has been replaced.
We recommend that servicing be performed only by
authorized Vertex Standard service technicians who
are experienced with the circuitry and fully equipped
for repair and alignment. Therefore, if a fault is sus-
pected, contact the dealer from whom the transceiv-
er was purchased for instructions regarding repair.
Authorized Vertex Standard service technicians re-
align all circuits and make complete performance
checks to ensure compliance with factory specifica-
tions after replacing any faulty components.
Those who do undertake any of the following align-
ments are cautioned to proceed at their own risk.
Problems caused by unauthorized attempts at re-
alignment are not covered by the warranty policy.
Also, Vertex Standard reserves the right to change
circuits and alignment procedures in the interest of
improved performance, without notifying owners.
Under no circumstances should any alignment be
attempted unless the normal function and operation
of the transceiver are clearly understood, the cause
of the malfunction has been clearly pinpointed and
any faulty components replaced, and realignment
determined to be absolutely necessary.
The following test equipment (and thorough famil-
iarity with its correct use) is necessary for complete
realignment. Correction of problems caused by mis-
alignment resulting from use of improper test equip-
ment is not covered under the warranty policy. While
most steps do not require all of the equipment list-
ed, the interactions of some adjustments may require
that more complex adjustments be performed after-
wards. Do not attempt to perform only a single step
unless it is clearly isolated electrically from all other
steps. Have all test equipment ready before begin-
ning, and follow all of the steps in a section in the
order presented.
Required Test Equipment
RF Signal Generator with calibrated output level
at 200 MHz
Oscilloscope
Deviation Meter (linear detector)
In-line Wattmeter with 5 % accuracy at 200 MHz
50 Ohm RF Dummy Load with power rating 10
W at 200 MHz
4 Ohm/1W AF Dummy Load (Attention : Audio
output is BTL output)
Regulated DC Power Supply (standard 7.5 V DC,
3 A)
Frequency Counter with 0.2 ppm accuracy at 200
MHz
Audio Signal Generator
AC Voltmeter
DC Voltmeter
VHF Sampling Coupler
Microsoft
®
Windows
®
2000, XP, Vista or Win-
dows7
Vertex Standard CE115 PC Programming Soft-
ware
CT-42 Connection Cable or FIF-10A USB Program-
ming Interface and CT-106 PC Programming
Cable.
CN-2A (P/N: A08420002) Antenna Connector
(98 pages)
(68 pages)
Manymanuals.com
Manymanuals.de
Manymanuals.fr
Manymanuals.it
Manymanuals.pl
Manymanuals.cz
Manymanuals.es
Manymanuals-pt.com
Comments to this Manuals