Vertex Standard TRANSCEIVER VX-1700 - Manual (Page 11)

11
Alignment
The VX-1700 is carefully aligned at the factory for
the specified performance across the entire operat-
ing 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 crit-
ical and tedious adjustments that are not normally
required once the product has left the factory. How-
ever, if damage occurs and some parts subsequent-
ly are replaced, 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
product was purchased for instructions regarding
repair. Authorized Vertex Standard service techni-
cians realign all circuits and make complete perfor-
mance checks to ensure compliance with factory
specifications after replacing any faulty components.
Those who do undertake any of the following align-
ments are cautioned to proceed at their own risk.
Problems caused by unauthorized attempts at re-
alignment 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 product are clearly understood, the cause of
the malfunction has been clearly pinpointed and any
faulty components replaced, and realignment deter-
mined to be absolutely necessary.
The following test equipment (and thorough famil-
iarity with its correct use) is necessary for complete
realignment. Correction of problems caused by mis-
alignment resulting from use of improper test equip-
ment is not covered under the warranty policy.
While most steps do not require all of the equip-
ment listed, the interactions of some adjustments
may require that more complex adjustments be per-
formed 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 sec-
tion in the order presented.
Required Test Equipment
RF Signal Generator with calibrated output lev-
el at 30 MHz
In-line Wattmeter with 5% accuracy at 30 MHz
50 Ohm RF Dummy Load with power rating of
200 W at 30 MHz
150 Ohm RF Dummy Load with power rating of
200 W at 30 MHz
Frequency Counter with 0.02 ppm accuracy at
100 MHz
AF Signal Generator
AC Voltmeter
DC Voltmeter: High input impedance
DC Ammeter
HF Sampling Coupler
IBM
® PC / compatible Computer with Win-
dows ® 95/98/ME/XP/2000. Internet Explorer 4.0
or higher
Vertex Standard CT-62 Programming Cable &
CE77 Programming/Alignment Software
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. Correct alignment is not possible with
an antenna.
After completing one step, read the following step
to determine whether the same test equipment will
be required. If not, remove the test equipment (ex-
cept dummy load and wattmeter, if connected) be-
fore proceeding.
Correct alignment requires that the ambient temper-
ature be the same as that of the radio and test equip-
ment, and that this temperature be held constant
between 20° C and 30° C (68° F ~ 86° F). When the
radio is brought into the shop from hot or cold air, it
should be allowed time to come to room tempera-
ture before alignment.