Alignment Without Instruments - Heathkit SW-717 Assembly

( )
Push
the AN
L
switch
(on
the rear panel)
to
OFF.
( )
Preset the
f
ront
panel
controls
as
follows:
( )
Tune
in
a station
of
known frequency
near
the high
end
of
Band
A. Adjust
C32
until the station
is received
properly when the main tuning indicator
shows
the
station's
correct frequency.
As
there
will
be
some
interaction,
repeat
the adjustment
of
L1 and C32
until
the
frequencies
of
both stations are
correctly
shown.
NOTE: The tuning indicator
will
be
nearly correct on
the
other three
bands,
but
adjustment
to
a station
of
known
frequency
is
preferable.
In the
United States, Federal Bureau
of
Standards
station
WWV
at Ft.
Collins, Colorado transmits
on
frequencies
of
2.5,5,
10, 15, 20, and 25
MHz.
lt
can be identified by
announcements
periodically.
At
other times
it
transmits
a
variety
of
tones, often
with
a
pulse
each second.
In
Canada,
the
Dominion
Observatory
station
CHU
transmits
continuously
on
frequencies
of
3.330,
7'335
and
14,670 MHz.
Transmissions
consist
of
a pulse each
second
with
time and station announcements each
minute
in French
and English.
lf
you know
an amateur radio operator, he may be able
to
transmit
a
test
signal
which
will
enable
you to
calibrate
your
receiver
on
at least one
frequency in
each
of
bands B, C, and
D.
Shortwave broadcast
stations
may
be.
used
for
calibration
when
their
frequencies
are known. Your local
library
probably
has a
copy
of
"World Radio
TV Handbook"
(or
a
similar publication) which lists station
frequencies' This
handbook is available
from the Heath Company as
Model
GDP-315.
The
"Alignment Chart" on
Page
46
tells you which
coils
and
capacitors
to
adjust
for
each band. Utilize
the
same
principles described
for
Band
A
- adjust coils
for
the low
end
of the
band and adjust
trimmer capacitors
for
the
high
end
of
the band.
c32
c33
c34
c35
c36
c37
c39
3t8
114
U+
tt+
1t8
1t8
1lA
VOLUME:
BAND:
MODE:
BFO:
off
A
AM
off
()
()
()
BANDSPBEAD
TUNING:
0
(centered)
MAIN
TUNING:
550
Temporarily push
the
connectors
on the
black
and
white twisted pair onto the
Nvo
speaker lugs.
Plug
in the
Receiver,
turn
it
on,
and
tune in a
radio
station
of
known frequency near
the low
end
of
band
A.
Refer
to
Inset Drawing
#1
and insert
the
shorter end
of
the alignment
tool into
the core
of
Ll.
Adjust
the
core
until
the main tuning indicator
shows
the correct
frequency of the station on the tuning
scale.
lr
ALIGNMENT WITHOUT INSTRUMENTS
( )
Refer
to
Figure
2
(fold-out
from
Page
40) and
turn
all
trimmer capacitors clockwise
until
they
are
just
snug.
Then
turn
each
one
counterclockwise
the following
number
of turns:
Trimmer
Turns
Counterclockwise