Vertex Standard VX-1210 Alignment Manual

The VX-1210 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 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 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 Vertex Standard 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 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 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
r
RF Signal Generator with calibrated output level at 30 MHz
r
In-line Wattmeter with 5% accuracy at 30 MHz
50 Ω RF Dummy Load with power rating 50W at 30MHz
r
16 Ω RF Dummy Load with power rating 50W at 30MHz
r
r
Frequency Counter with 0.02ppm accuracy at 40MHz
r
AF Signal Generator
r
AC Voltmeter
r
DC Voltmeter: High input impedance
r
DC Ammeter
r
HF Sampling Coupler
r
IBM PC / compatible Computer with MS-DOS or later operating system
r
Yaesu ___ Connection Cable & ___ Channel/Alignment Diskette
VX-1210 Alignment
1
VX-1210
Alignment