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Heathkit SB-1000 - Page 44

Heathkit SB-1000
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Page
46
Refer
to
Pictorial
following
steps.
O
YZ
ke
/
as
a
A
QO
v
Position
capacitors
C24
and
C25
away
from
the
frame
of
the
nearby
variable
capacitor.
Locate
the
160
&
80
meter
tank
coil.
Then
Refer
to
Detail
6-12A
and
use
the
following
procedure
to
prepare
the
coil:
Position
the
coil
as
shown
in
Part
A
of
the
Detail.
Note
the
way
the
leads
extend
from
the
coil.
Use
a
1/4"
screwdriver
blade
to
carefully
push
down
the
second
winding
turn
from
each
end
of
the
coil.
Reposition
the
coil
as
shown
in
Part
B
of
the
Detail
so
the
two
turns
you
pushed
down
in
step
2
are
down.
Again
note
the
way
the
leads
extend
from
the
coil.
Use
a
felt-tip
marker
to
mark
the
18th
and
20th
turn
from
end
A
of
the
coil.
When
you
have
the
correct
turns
marked,
you
should
have
24
turns
between
the
20th
tum
and end
B
of
the
coil.
When
you
have
the
18th
and
20th
turns
correctly
marked,
use
a
screwdriver
blade
to
push
these
turns
down.
Shorten
the
lead
at
end
A
of
the
coil
to
2-
3/8”
and
the
lead
at
end
B
to
2-3/4".
L8:
Use
the
following
procedure
to
install
the
prepared
coil
in
the
main
chassis:
1,
Set
the
coil
on
top
of
spacers
BL
and
BN
as
shown.
Note
the
way
the
leads
extend
from
the
coil.
Then
bend
the
solder
lugs
at
BL
and
BN
around
the
indicated
coil
windings
and
solder
them
to
the
windings.
NOTE:
Raise
each
end
of
the
coil
while
you
form
the
solder
lugs.
Connect
the
lead
at
the
right-hand
end
of
the
coil
to
solder
lug
CK
(S-1).
Route
the
wire
so
it
does
not
touch
other
160
&
80
meter
coil
windings
or
the
plate
choke.
Route
the
lead
at
the
left-hand
end
as
shown
and
form
the
end
of
the
lead
so
it
is
uncnesy
2
612
while
you
perform
the
a
y
Heathkit
against
the
solder
lug
at
switch
SW2E
lugs
11
(NS).
This
lead
will
be
soldered
later.
Cut
a
4"
length
of
large
bare
wire.
Use
this
wire
in
the
next
step.
Connect
a
4”
large
bare wire
from
the
19th
turn
of
coil
L8
(S-1)
to
switch
SW2E
lugs
12
(both
lugs).
Solder
the
wire
to
the
lugs.
NOTE:
You
will
have
to
flatten
the
end
of
the
wire
so
it
can
pass
through
the
holes
in
the
lugs.
Refer
to
Pictorial
6-13
while
you
perform
the
folloying
steps.
¢
Q
Locate
the
40,
20, 15,
&
10
meter
tank
coil.
Then
refer
to
Detail
6-13A
and
use
the
following
procedure
to
prepare
the
coil:
b
Position
the
coil
as
shown.
Note
the
locations
of
the
three
taps
and
the
mounting
lug
on
one
end.
Grasp
the
coil
near
tap
#1
with
one
hand.
Then
use
the
other
hand
to
carefully
stretch
the
remaining
turns
of
the
coil
until
the
end-to-end
length
is
4”
as
shown.
NOTE:
Stretch
the
coil
so
the
turns
are
fairly
equally spaced.
L7:
Refer
to
Detail
6-13B
and
use
the
following
procedure
to
install
the
prepared
coil
in
the
main
chassis:
1
vy
Pp
Use
a
10-32
brass
nut
to
mount
the
coil
to
variable
capacitor
C27
at
CP.
Tighten
the
nut
only
finger
tight
at
this
time.
Insert
the
wire
at
the
free
end
of
the
coil
1/8"
through
the
solder
lug
at
switch
SW2E
lugs
11.
Do
not
solder
the
wire
to
the
lug
yet.
Position
the
coil
so
it
is
parallel
to
the
chassis
and
coil
L8.
Then
tighten
the
brass
nutat
CP.
Solder
the
other
end
of
the
coil
to
the
solder
lug
at
switch
SW2E
lugs
11.
Also
make
sure
you
solder
the
end
of
the
large
bare
wire
coming
from
coil
L8
to
the
solder
lug.

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