Alignment - Vertex Standard VX-820 Series Service Manual

Introduction
The VX-820 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 placed, realignment may be required. If
a sudden problem occurs during normal operation,
it is likely due to component failure; realignment
should not be done until after the faulty component
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 1 GHz
Deviation Meter (linear detector)
In-line Wattmeter with 5 % accuracy at 1 GHz
50 Ohm RF Dummy Load with power rating 10
W at 1 GHz
16 Ohm AF Dummy Load (Attention : Audio out-
put is BTL output)
Regulated DC Power Supply (standard 7.5 V DC,
3 A)
Frequency Counter with 0.2 ppm accuracy at 1
GHz
Audio Generator
AC Voltmeter
DC Voltmeter
UHF Sampling Coupler
IBM PC / compatible Computer with Microsoft®
Windows® 95 or later operating system
Vertex Standard CE59 (version 2.06 or later) Align-
ment program and CT-109 PC Programming
Cable or FIF-10A USB Interface/CT-108 PC Pro-
gramming Cable
: When using the FIF-10A USB Interface, requires
the Windows® 2000 or Windows® XP

Alignment

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