Yaesu FTV-901R, Инструкция по эксплуатации

Страница: 23 / 42

MAINTENANCE AND ALIGNMENT
The FTV-901 R has been carefully aligned and
tested at the factory prior to shipment. With
normal use, if the unit is not abused, the FT-901 R
will provide many years of trouble-free operation .
Sudden difficulties are usually the result of parts
failures, rather than alignment problems. There­
fore, alignment should not be undertaken unless
the operation of the transverter is completely
understood, the fault
has been throughly
diagnosed, and the trouble has been definitely
traced to misalignment rather than part failure.
Attempts to align this equipment by other than an
experienced technician are discouraged.
For alignment purposes, a VTVM with RF probe
good to
450
MHz is required. Also, a signal
generator good to
450
MHz, and a frequency
counter good to 250 MHz are required. A dummy
load and wattmeter good to
450
MHz are also
required.
REG UNIT (PB-1975)
Connect a DC voltmeter to pin 11 of multijack
MJl , 2, or 3. Adjust VR1701 for a reading of
13.8 volts.
ALC AMP UNIT (PB-1946)
( 1) Set the HF transceiver to 29 MHz, CW mode.
( 2) Connect the RF probe of the VTVM to the
input of the ALC AMP unit, and adjust the
HF transceiver DRIVE or CARRIER control
for an output of 3 volts RM S while transmit­
ting.
(3)
Connect the DC voltmeter between the hot
lead and case of C 181 8. Set the ALC meter to
AM. Adjust VR1 802 for a reading of
5
volts
on the voltmeter.
(4)
Connect the RF probe of the VTVM to the
output of the ALC AMP unit. Adjust T 1801
for a maximum VTVM indication. Adjust
VR1803 for a maximum VTVM indication
(0.7 volts nom.).
(5)
Set the FTV-901R meter switch to INPUT.
Adjust VR1801 for a reading of . 2 on the
meter.
VR19os
-­
VR1902
VR1901
ALC UNIT C1818 ALC UNIT
OUTPUT
INPUT
- 21 -