Vertex Standard VX-1400 Service Manual Download

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VX-1400 Series Service Manual

Alignment

Introduction and Precautions

The following procedures cover adjustments that are not
normally required once the transceiver has left the facto-
ry. However, if a problem occurs during normal opera-
tion due to component failure; realignment may be re-
quired after the faulty components have been replaced.

We recommend that authorized Vertex Standard Techni-
cians, who are experienced with the circuitry and fully
equipped to repair and align our products, perform re-
pairs. If a fault is suspected, contact the selling dealer for
instructions regarding repair. Authorized Vertex Standard
Technicians have the latest information to align all cir-
cuits and make complete performance checks to ensure
compliance with factory specifications after repairs.

Those who undertake the following alignments are cau-
tioned to proceed at their own risk. Problems caused by
unauthorized attempts at realignment are not covered by
the warranty policy.

Vertex Standard must reserve the right to change circuits
and alignment procedures in the interest of improved
performance, without notifying owners.

Under no circumstances should any alignment be at-
tempted unless the normal functions and operation of the
transceiver are clearly understood, the cause of the mal-
function has been clearly identified and all faulty compo-
nents replaced. The need for realignment should be de-
termined to be necessary.

The following test equipment (and a thorough familiari-
ty with its correct use) is necessary for correct alignment.
Most steps do not require all of the equipment listed. The
interactions of some adjustments may require that sever-
al adjustments be performed in a sequence. Do not at-
tempt to perform only a single step unless it is clearly
isolated electrically from all other steps. Have all test
equipment ready before beginning, and follow all of the
steps in a section in the order they are presented.

Required Test Equipment

RF Signal Generator

AF Signal Generator

Spectrum Analyzer good to at least 1 GHz.

Frequency Counter

RF Millivoltmeter

Digital DC Voltmeter (high-Z, 1 M-Ohm/V)

DC Voltmeter

DC Ammeter (20 A)

Ohmmeter

50-Ohm Dummy Load (150 watts)

150-Ohm Dummy Load (150 watts)

In-Line Wattmeter (100 watts, 50-Ohm)

RF Sampling Coupler

4-Ohm AF Dummy Load (15 watts)

IBM

PC / compatible Computer with Windows

Vista/XP/2000

Vertex Standard VPL-1 or FIF-10 + CT-104A Pro-
gramming Cable & CE111 Programming Soft-
ware

Alignment Preparation & Precautions

A 50-ohm RF Dummy load and in-line wattmeter must
be connected to the "ANT" jack in all procedures that call
for transmission, except where specified otherwise. Cor-
rect alignment is not possible with an antenna.

After completing one step, read the following step to de-
termine whether the same test equipment will be required.
If not, remove the unneeded test equipment before pro-
ceeding (except the dummy load and wattmeter).

Correct alignment requires that the ambient temperature
be maintained constant between 68 °F ~ 86 °F (20 °C ~ 30
°C). When the transceiver is brought into the shop from a
hot or cold environment, it should be allowed time to come
to room temperature before alignment. Also, the test
equipment must be thoroughly warmed up before begin-
ning.

Whenever possible, alignments should be made with os-
cillator shields and circuit boards firmly affixed in place.

Note: Signal levels in dB referred to in this procedure

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

Caution:

Do not connect the audio output line to ground,
and be certain that the speaker has adequate ca-
pability to handle the audio output from the
radio.