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Chapter 5

Alignment

The

EVX-S24

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 component replacement and service should be
performed only by an authorized Vertex 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 replaced, realign-ment 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
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 suspected, con- tact 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 procedures 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 malfunction has been clearly pinpointed
and any faulty components replaced, and realignment determined to be absolutely necessary.

The following test equipment (and thorough familiarity with its correct use) is necessary for complete
realignment. Correction of problems caused by misalignment resulting from use of improper test
equipment is not covered under the warranty 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 follow all of the
steps in a section in the order presented.

5.1

Required Test Equipment

• Frequency Counter with 0.2 ppm accuracy at 600 MHz

• Deviation Meter (linear detector)

• 50 Ohm RF Dummy Load with power rating 10 W at 600 MHz

• UHF Sampling Coupler

• In-line Wattmeter with 5% accuracy at 600 MHz

• Regulated DC Power Supply (standard 3.7 V DC, 3 A)

• Vertex Standard CN-3 (P/N: A08760001) Antenna Connector

• IBM

PC/compatible Computer with Microsoft

Windows