5-7. 50 kHz BFO AND IF ALIGNMENT.
a
b
c
d.
e.
Apply signal of exactly 50.000 kHz to pin 2 of
V4 (6EJ7). (Maximum frequency error of 25 Hz.)
Set
PASSBAND
control to exact center of range
(12 o’clock position).
Set MODE switch to CW
.5
or CW
.25
position.
Tune Tl 1 for zero beat.
Tune
T7C
and Tl0 for maximum negative volt-
age on AGC line or for maximum S meter
reading.
f. Disconnect
50
kHz signal from V4.
5-8. 5645 OSCILLATOR
ADJUSTMENT.
a. Connect signal generator or oscillator to pin 2 of
V2 (6EJ7).
b. Set generator frequency with counter to exactly
5645.000 kHz. Accuracy should be within
50
Hz.
c. Adjust
C59
(top trimmer on second mixer oscil-
lator board on top of chassis) for zero beat.
d. Disconnect generator from V2.
5-9. FILTER MATCH ALIGNMENT.
a.
b.
C.
d.
e.
f.
g .
h.
Tune in crystal calibrator signal on 80 M band.
Set AGC switch to M.
Turn MODE Switch to AM mode.
Adjust PTO upwards in frequency until cali-
brator level drops 20
dB
(or 4 S units).
Adjust
T5
for maximum negative AGC voltage
or maximum S meter reading.
Set MODE Switch to SSB and PASSBAND
TUNING to center.
Tune PTO until calibrator signal is zero beat.
Turn PASSBAND TUNING control counter-
clockwise toward LSB until S meter drops 25
dB
(or 5 S units).
Tune C42 and T6 for maximum S meter reading
or maximum negative AGC voltage. If 2 peaks
are observed on C42, choose the one at mini-
mum capacitance.
5-10. NOTCH FILTER ADJUSTMENT.
a. Turn NOTCH control until the slug in the notch
coil is the greatest distance out of the coil (to-
b.
C.
d.
e.
f.
ward the front panel). The pointer on the knob
should be at the nine o’clock position. If it isn’t,
loosen the knob setscrew and position the knob
at the nine o’clock setting. Tighten set screw.
Turn NOTCH control until it goes into the detent
(slug completely into coil). The knob should be
at the “OFF” position.
Tune in signal generator on any band, SSB Mode.
Set level for approximately 30
dB
over S9.
Set PASSBAND control to exact center (12
o’clock).
Tune PTO for zero beat.
Adjust NOTCH control for null. The knob
should point very close to the 12 o’clock posi-
tion. If it doesn’t, adjust the slug in the notch
coil until the null occurs at 12 o’clock. Be sure
steps c and d have been performed before mak-
ing any adjustment.
Keep the NOTCH control adjusted for deepest
null, and adjust R39 (the red potentiometer lo-
cated on the longest PC board) for deepest notch.
5-l 1. 5595 OSCILLATOR ADJUSTMENT.
This oscillator affects only the AM mode.
a. Tune in signal generator on any band in the SSB
Mode.
b. Set PASSBAND control at exact center.
c. Tune PTO for zero beat.
d. Adjust NOTCH control for deepest null.
e. Switch MODE switch to AM being careful not to
upset other control settings.
f. Adjust
C60
(lower trimmer on second mixer
crystal oscillator board on top of chassis) for
deepest notch.
5-12.
ANTENNA, RF, AND INJECTION
ALIGNMENT.
Turn off the receiver. Refer to figure 5-2 and
determine the location of Sl D and Sl E (these
are the third and fourth bandswitch wafers,
counting from the front of the receiver). Locate
these switch wafers in the receiver. Each of these
switch wafers has two rotor contacts colored
5-2
(31 Seiten)
(472 Seiten)
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