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Alignment

Introduction

The

VX-6R/E

is carefully aligned at the factory for the

specified performance across the amateur band. Realign-
ment should therefore not be necessary except in the event
of a component failure. Only an authorized VERTEX
STANDARD representative should perform all compo-
nent replacement and service, or the warranty policy may
be void. The following procedures cover the adjustments
that are not normally required once the transceiver has
left the factory. However, if damage occurs and some parts
subsequently are replaced, 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 re-
placed. 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. If a fault is suspected, contact
the dealer from whom the transceiver was purchased for
instructions regarding repair. Authorized VERTEX STAN-
DARD service technicians realign all circuits and make
complete performance checks to ensure compliance with
factory specifications after replacing any faulty compo-
nents. Those who do undertake any of the following align-
ments are cautioned to proceed at their own risk. Prob-
lems caused by unauthorized attempts at realignment are
not covered by the warranty policy. Also, VERTEX STAN-
DARD reserves the right to change circuits and alignment
procedures in the interest of improved performance, with-
out notifying owners.

Under no circumstances should any alignment be at-

tempted unless the normal function and operation of the
transceiver are clearly understood, the cause of the mal-
function has been clearly pinpointed and any faulty com-
ponents replaced, and realignment determined to be ab-
solutely necessary.

The following test equipment (and familiarity with its

use) is necessary for complete realignment. Correction of
problems caused by misalignment resulting from use of
improper test equipment is not covered under the war-
ranty policy. While most steps do not require all of the
equipment listed, the interactions of some adjustments
may require that more complex adjustments be performed
afterwards. 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 beginning and, fol-
low all of the steps in a section in the order presented.

Required Test Equipment

❍

RF Signal Generator with calibrated output level at 500 MHz

❍

Deviation Meter (linear detector)

❍

In-line Wattmeter with 5% accuracy at 500 MHz

❍

50-ohm, 10-W RF Dummy Load

❍

8-ohm AF Dummy Load

❍

Regulated DC Power Supply adjustable from 3 to 15 V DC, 3A

❍

Frequency Counter: 0.2-ppm accuracy at 500 MHz

❍

AF Signal Generator

❍

AC Voltmeter

❍

DC Voltmeter: high impedance

❍

UHF Sampling Coupler

❍

SINAD Meter

Alignment Preparation & Precautions

A 10 W RF dummy load and in-line wattmeter must

be connected to the main antenna jack in all procedures
that call for transmission, alignment is not possible with
an antenna. After completing one step, read the next step
to see if the same test equipment is required. If not, re-
move the test equipment (except dummy load and watt-
meter, if connected) before proceeding.

Correct alignment requires that the ambient tempera-

ture be the same as that of the transceiver and test equip-
ment, and that this temperature be held constant between
68 ~ 86 °F (20 ~ 30 °C). When the transceiver is brought
into the shop from hot or cold air, it should be allowed
some time to come to room temperature before alignment.
Whenever possible, alignments should be made with os-
cillator shields and circuit boards firmly affixed in place.
Also, the test equipment must be thoroughly warmed up
before beginning.

Note: Signal levels in dB referred to in the alignment procedure

are based on 0 dBµ=0.5 µV (closed circuit).

Test Setup

Set up the test equipment as shown below for transceiv-

er alignment, and apply 8.9 V DC power to the transceiver.
Refer to the drawings for Alignment Points.

Alignment Setup

Wattmeter

In-Line

Dummy Load

50-ohm RF

Coupler

Sampling