Vertex Standard VX-2500V ユーザーズマニュアル

The VX-2500V is carefully aligned at the factory for the

specified performance across the frequency range speci-

fied for each version. Realignment should therefore not

be necessary except in the event of a component failure,

or altering version type. All component replacement and

service should be performed only by an authorized Ver-

tex Standard representative,or the warranty policy may

be void.
The following procedures cover the sometimes critical and

tedious adjustments that are not normally required once

the transceiver has left the factory. However, if damage

occurs and some parts subsequently are placed, realign-

ment may be required. If a sudden problem occurs dur-

ing normal operation, it is likely due to component fail-

ure; realignment should not be done until after the faulty

component has been replaced.
We recommend that servicing be performed only by au-

thorized Vertex Standard service technicians who are ex-

perienced with the circuitry and fully equipped for repair

and alignment. Therefore, if a fault is suspected, contact

the dealer from whom the transceiver was purchased for

instructions regarding repair. Authorized Vertex Standard

service technicians realign all circuits and make complete

performance checks to ensure compliance with factory

specifications after replacing any faulty components.
Those who do undertake any of the following alignments

are cautioned to proceed at their own risk. Problems

caused by unauthorized attempts at realignment are not

covered by the warranty policy. Also, Vertex Standard

reserves the right to change circuits and alignment proce-

dures in the interest of improved performance, without

notifying owners.
Under no circumstances should any alignment be attempt-

ed unless the normal function and operation of the trans-

ceiver are clearly understood, the cause of the malfunc-

tion has been clearly pinpointed and any faulty compo-

nents replaced, and realignment determined to be abso-

lutely necessary.
The following test equipment (and thorough familiarity

with its correct use) is necessary for complete realignment.

Correction of problems caused by misalignment result-

ing from use of improper test equipment is not covered

under the warranty policy. While most steps do not re-

quire 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 follow all of

the steps in a section in the order presented.

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RF Signal Generator with calibrated output level

at 500MHz

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Deviation Meter (linear detector)

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In-line Wattmeter with 5% accuracy at 1000MHz

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50W RF Dummy Load with power rating 100W

at 500MHz

r

4W AF Dummy Load

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Regulated DC Power Supply (standard 13.8V

DC, 15A)

r

Frequency Counter with 0.1ppm accuracy at

500MHz

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AC Voltmeter

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DC Voltmeter

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VHF Sampling Coupler

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IBM PC/compatible Computer

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Oscilloscope

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Vertex Standard VPL-1 Connection Cable &

Alignment program

A 50W RF Dummy Load and in-line wattmeter must be

connected to the main antenna jack in all procedures that

call for transmission, except where specified otherwise.

Correct 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 test equipment (except dummy load

and wattmeter, in connected) before proceeding.
Correct alignment requires that the ambient temperature

be the same as that of the transceiver and test equipment,

and that this temperature be held constant between 68°F

and 86°F (20°C ~ 30°C). When the transceiver is brought

into the shop from hot or cold air, it should be allowed

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 pro-

cedure are based on 0dBm EMF = 0.5mV.