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BFO ADJUSTMENT
Set the Receiver front panel controls as follows:
BANDSPREAD,
,.... adjust for a 5 indication
on the Bandspread dial,
AF GAIN, os teeeeee adjust as necessary dur-
Sie = alignment,
RF GAIN,
. 2. . oe oe eee ees full clockwise,
ANT
TRIM,
...
2.22
ee22.e-.
full clockwise,
MODE
es
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AM,
BAND
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MAIN
TUNING
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4.5
Mc,
AVC
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ON,
ANL,
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OFF.
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,
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GBC
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( } Connect the common lead of the signal
generator to the Receiver chassis and con-
nect the output
lead to the ANT
socket,
( ) Set the signal generator to 4,5 MC and the
imum
mater
ras
fy
AAAMEEL
SEL
2
() Set the signal generator output
for a reading
between
3 and
4 on the tuning
meter,
( ) Turn the signal generator
modulation off,
~~ —
maximum
meter
reading,
|
—
Reduce the signal generator
output or the
RF GAIN
control for a meter reading of 3,
Peed
hee
asl
He
Adjust
the Bandspread dial pointer for a
Tre
a=
Page
( } Turn the MODE
switch to USB, A continu-
ous tone should be heard, If it is not heard,
adjust coil L18 located on the IF-audio cir-
cuit board, This
coil should not have to be
adjusted more
than one turn in either di-
rection before the tone is heard,
NOTE:
In the following steps, coil L18 will be
.
adjusted. for a zero
beat,
Zero
beat
can be
defined in the following way: As the coil is ad-
justed,
the tone
you
hear
decreases
from a
high to a graduaiiy lower pitch, until no tone is
heard at all, This point where notone is heard is
called the zero beat point, If you continue to ad-
just the coil in the same direction, the tone will
gradually increase from
a low to a high pitch
again,
( } Turn
the MODE
switch to AM and adjust
the Bandspread dial pointer slowly towards
10 until a meter reading of 2.5 is obtained,
NOTE:
As the Bandspread
is adjusted to-
wards
10, the meter response is propor -
Hanal ta the
ervatal filter rasnanee
Dur
tional to ihe crystal filter response, During
these adjustments, the BFO is set, first on
. one side of the crystal filter response slope,
and then on the other side, When the Mode.
switch is set in the LSB position, capacitors
C48 and C49 are switched into the BFOcir-
cuitry
to move
the BFO
frequency
to the
41
wide
of the
glans
OWer
5idé Of
ine siope,
{ } Turn
the
threaded
shaft of the 1-10 uuf
trimmer capacitor until zero beat is reached,
( ) Remove the Signal Generator leads from the
Receiver,
.
This completes
the alignment of the Receiver,
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