430 MHz UNIT
(2)
Connect the RF probe of the VTVM to the
cathode of Di 502 . Peak TC1501 -TC1 5 04 for a
maximum indication on the VTVM while
transmitting .
Please remove the
5 0
and
1 44
MH z units , if
installed , to allo w access to test points on the
430
MH z unit .
1.
Local oscillator circuit
( 1)
Connect a DC voltmeter to pin
2
of the edge
connector for the
430
MH z unit . Set the
BAN D s witch to
430-432,
and con firm that
1 1
volts is present . In turn , check pins
3, 4, 5,
and
6
for
11
volts , while s witched to the
432-434, 434-436, 436-438,
and
438-
440
MH z bands , respectively .
( 2) Connect the RF probe of the VTVM to TP1 ,
and adjust Li602 , Ti601 , and Ti602 for
maximum indication on the VTVM .
(3)
Connect t he frequency counter to TP1 . Re fer
to the chart belo w, and adjust TC1601 -
TC16os f or local output readings as shown for
the various positions of the BAN D s witch .
(4)
Connec t the DC voltmenter to TP2 , and
adjust
TC1 sos -TC1 so9
f or
maximum
indication on the voltme ter
( 1
volt nom . ) .
2.
Receiver section
(1)
Set the transceiver to
29
MH z , and peak the
receiver preselector against the marker signal
for maximum sensitivity .
( 2) Connect the DC voltme ter to pin
1 9
of the
edge connector , and check for
1 3 .8
volts at
each position of the BAN D s witch over
430-440
MH z .
(3)
Connect the signal generator to the
430
MH z
ANT jack , set its output to
43 1
MHz, and
tune the receiver to the generator signal .
Adjust TC1201 -TC1203 and TC1 5 01 -TC1 so4
for a maximum S-meter indication on the HF
transceiver . Repeat on
433
MHz ,
435
MH z ,
437
MH z , and
439
MH z . Recheck the results
to ensure maximum response across the entire
operating range .
3.
Transmitter section
( 1)
Connect the dummy load /wa ttmeter to the
430
MHz ANT jack . Se t VR1201 and VR1202
fully counter clock wise . Se t the transceiver
D RI VE or C ARR I ER control to the center of
its range
( 1 2
o 'clock position) .
(3)
Connect the RF probe of the VTVM to the
hot side of Li 213 . Peak TC1203 -TC1 206 for a
maximum indication on the VTVM .
( 4)
Connect the RF probe of the VTVM to
terminal A on the
430
MH z unit . Peak
TC140 1 -TC1406 f or a maximum indication
on the VTVM .
(5)
Con firm the results in steps
(2)
through
(4)
on the wattmeter .
(6)
Repeak the points in steps
(2)
thro ugh
(5)
on each position of t he BAN D s witch , then
recheck the results to ensure maximum
performance over the entire range
430-
440
MH z .
(7)
Set the meter s witch to P O . Set the
transceiver DRIVE or CARRIER control for
an output of
1 2
watts . Adjust VR1203 for an
indication of
.8
on the P O meter .
(8)
Beginning at zero drive , increase t he level
of the DRIVE or C ARRI ER control on t he
transceiver until the transverter power out
put does not increase further .
(9)
Advance VR1201 slowly clockwise un til e qual
power output is achieved across the
430-
440
MH z range .
( 1 0)
Rotate VR1 202 fully clockwise .
(1 1)
While transmitting , rotate VR1301 to secure
maximum po wer output on the wattmeter .
( 1 2)
No w rotate VR1202 fully clockwise . While
transmitting , slo wly rotate VR1202 counter
clockwise ,until the po wer output just begins
to f all o ff . Do not go past the threshol d point .
( 1 3)
Remove the dummy load from the
430
MHz
ANT jack . V.hile transmit ting , check to be
sure that the P O meter indicates
.2
with no
load applied . If not , check the AFP unit f or
mal functioning parts .
- 26 -
