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C.
Peak ANTENNA trimmer
(C2),
d.
If the meter
does
not read $9, adjust
Meter
Sensitivity
potentiometer
(R13)
near top center of chassis forS9 read-
ing,
e,
Recheck Meter Zero setting
and repeat
adjustments if necessary.
5-5,
BFO CALIBRATION.
To
check
the
BFO
calibration,
set
the receiver
controls
for
CW
reception,
SELECTIVITY t 0 0.5
and tune
in an unmodulated signal for maximum
S meterdeflection.
With
the BFO
control
at mid
rotation
(CW position),
the beat-note
frequency
should be between
700 and 1000 cycles and zero beat
Should
occur
with the control
rotated
approxi-
mately forty-five degrees clockwise from the cen-
ter position.
u the control
is far from
its correct setting, it
ay be roughed in in the followin 1g Manner.
r e
Remove
the BFO
knob
and
the
adapter
bushing from the BFO tuning shaft.
2,
Set
receiver
controls
for
CW
reception,
SELECTIVITY in the 2.5 position and tune receiver
to clear frequency (no signal),
3.
With screwdriver, run the BFO tuning shaft
in or out as necessary to the point where the noise
becomes lowest in audio pitch witha symmetrical
rise in pitch in either direction from this point.
With
the
shaft
set at the point of lowest audio
noise pitch, replace the shaft bushing with the long
.
wn
feartinal
masnitic
set screw
straight
up (vertical
position).
4.
Replace BFO knob
with indicator line in CW
position (mid rotation).
SECTION
VI
SERVICE
DATA
6-1.
TECHNICAL SPECIFICATIONS.
FREQUENCY
COVERAGE
FREQUENCY
CALIBRATED
BAND
RANGE
BANDSPREAD
1
0.540 to 1.60 MC
2a
2
1.75
to
4.9
MC
80M
3
4.8
toi2.6
MC
40M
4
12.5
to 34.0
MC
20, 15, 10M,
Citizens Band
TUBES
Nine plus voltage regulator and rectifier,
SPEAKER OUTPUT
3.2 ohms
HEADPHONE IMPEDANCE
50 to 5000 ohms.
ANTENNA INPUT IMPEDANCE
50 to 600 o
ohms.
POWER
SOURCE
105 to 125 volts, 50/60 cycles.
POWER
CONSUMPTION
85 watts.
RECEPTION
AM, CW, and SSB.
14-
INTERMEDIATE
FREQUENCIES
(Double Conversion):
50 KC and 1650 KC.
DIMENSIONS (overall) (HWD)
Q
hy
10_9/4A
Lb.
Mw
My
4UTO/ Z UY
SHIPPING
WEIGHT
32-1/2 pounds.
NET WEIGHT
28- 3/4 n pounds,
6-2,
50-KC-IF SYSTEM.
Figure
10 shows
the type of coupling used in the
50-KC
IF system. Note that inductive coupling is
avoided by careful
shielding of the IF coils and
signal transfer
occurs only through capacity and
resistance.
By increasing the value of R (resis-
tance) and decreasing C (capacity), the selectivity
is made broader; while decreasing R and increasing
C causes the selectivity to become sharper. The
proper
values
of
CandR are switched in the circuit
by means
of the SELECTIVITY
control.
R varies
tho
Q of the tuned cirgquit and Cyaries
tho
coupling,
This R-C
coupling arrangement
affords a more
accurate
means
of selectivity control than that
readily obtainable by any other method.
6-3.
CHASSIS REMOVAL.
easy access sto both sides my the Chassis. To
move
the chassis and panel assembly from the eae.
remove
the four outer bottom
screws
and slide
chassis forward through front of cabinet.
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