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SO
MHz UNIT
144
Please remove the
installed , to allow access to test points on the
50 MHz module.
1.
Local oscillator circuit
( 1) Connect the DC voltmeter to pin
edge connector f or the 50 MHz unit. Confirm
that 11 volts is present , with the B AN D
50-52
switch set to
MHz , and check f or 11 volts at pin 3 of the
edge connector.
(2)
Connect the RF probe of the VTVM to the
LOC AL OUT terminal. Confirm that the unit
is oscillating.
(3) Connect a frequency counter to the L OC AL
OUT terminal. Set the BAN D switch to
52
MHz, set the R PT swi tch to S IMP , and
adjust T102 f or a reading of exact ly 2 2.0 MHz.
52-54
Switch to
MHz , and adjust TC2 03 for
a reading of 24.0 MHz.
2.
Receiver section
( 1)
Set the HF transceiver to 29 MHz, and peak
the preselector against the mar ker signal f or
maximum sensitivity.
( 2 )
Connect the DC voltmeter to pin 1 9 of the
edge connector , set the BAN D switch to
52
52-54
MHz , then
13 .8 volts is present.
(3)
Connect the DC voltmeter to pin 15 of the
edge connecto r, and rotate the FTV- 901 R
RF GAIN control fully countercloc kwise. The
voltmeter reading should be 0 volts. In the
fully c lockwise position , it should be 13.8
volts. Afte r confi rming these voltages , please
leave the lev el at maximum gain.
( 4)
Connect the DC voltmeter to pin 1 4 of the
edge connector , and set the FTV-901R TUN E
control to the center position (1 2 o ' cloc k).
With the B AN D switch in the
positio n , adjust V R 1 9 0 1
volts.
(5)
Connect a signal generato r to the 50 MHz
ANT jac k, and set the FTV-901 R B AN D
50-52
switch to
MHz. Set the signal genera
51
tor to
M H z , and tune the receiver to its
output.Pea k VR 1902 T 2 06 , T 2 0 7 , T 2 0 s ,and T 2 09
for a maximum reading on the HF t ransceiver
S-meter. Reduce the signal generator outpu t,
and 430 MHz units , if
2
of the
52-54
MHz. Switch to
50-
50-
MHz, and confi rm that
50-52
MHz
for
4
a reading of
if necessary , to secure easy viewing of the
pea k point. Switch to the
set the signal generator output to 53 M Hz ,
and repeak these transf ormers again while
tuned to the generator frequency. Then
recheck the results at
3.
Transmitter section
( 1) Connect a dummy load
50 MHz ANT jack.
fully counterclockwise. Set the HF transceiver
DR IV E o r C ARR I ER control to the center
(12
its range
50-52
to
MHz.
(2)
Connect the RF probe of the VTVM to the
collector of Q203. While transmitting , pea k
T10 1 , T 102 , T z o3 , T104 , and T1o s
maximum reading on the VTVM (0.4 volts
RMS nom.).
(3) Connect the RF pbobe to terminal A on the
50
MHz unit. Peak TC201 and L 1 os for a
maximum reading on the VT VM ( 4 volts
RMS nom.).
(4)
While
t rans mitting ,
TC2 03 , TC2 0 4 , and TC2 os for a maximu m
power output indication on the wattm e te r.
(5)
Repeat steps
MHz band. Then recheck the resu lts at
50-52
MHz.
( 6)
Set the FTV- 901 R meter switch to the P O
position , and set the transceiver DR I V E o r
C ARR I ER control f or an output of 1 2 watts
from the transve rte r. Set VR302 for a reading
of .8 on the FTV- 901R meter.
(7)
Beginning at zero drive , gradually incr eas e the
transceiver DR IV E or C ARR I ER control until
th e out put f rom the transve rt er do es not
increase more. Do not exceed this level.
( 8) Rotate VR 202 slowly clockwise , u n ti l an
output of 1 2 watts is secured across the
50-54
MHz range.
( 9)
Set VR 203 fully clockwise.
(10) While t ransmitting , rotate VR30 1 to s ecu re
maximum powe r output on the wattme te r .
(11) Now rotate VR203 fully counte rcloc kwise.
W hile
t ransmitting ,
clockwise , until the powe r output just begins
to fall off. Do not go past the th reshold point.
- 22 -
52-54
MHz band ,
51
MHz.
wattmeter to the
/
Set VR 202 and VR 203
o 'clock). Set the BAN D switch
pea k TC2 01 ,
(2)
(4)
th rough
on the
rotate VR 203
for a
TC2 02 ,
5 2-54
slowly
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