VXR-7000U
K66VXR-7000U_Alignment.doc
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VXR-7000U Alignment
The VXR-7000 is carefully aligned at the factory for the specified performance across the entire
operating frequency range. Realignment should therefore not be necessary except in the event of a
component failure. All component replacement and service should be performed only by an authorized
Yaesu/Vertex 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 repeater has left the factory. However, if damage occurs and some parts
subsequently 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 Yaesu/Vertex service technicians who
are experienced with the circuitry and fully equipped for repair and alignment. Therefore, if a fault is
suspected, contact the dealer from whom the repeater was purchased for instructions regarding repair.
Authorized Yaesu/Vertex 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, Yaesu/Vertex 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 repeater 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.
Required Test Equipment
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RF Signal Generator with calibrated output level at 1,000 MHz
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Deviation Meter (linear detector)
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In-line Wattmeter with 5% accuracy at 1,000 MHz
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50
Ω
RF Dummy Load with power rating 100W at 1,000MHz
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4
Ω
AF Dummy Load
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Frequency Counter with 0.2ppm accuracy at 1,000MHz
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AF Signal Generator
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AC Voltmeter
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DC Voltmeter: High input impedance
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VHF Sampling Coupler
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SINAD Meter
