Heathkit SB-1000 - Page 30

Page 32
4 Slide a #6 lockwasher onto the screw on
the outside of the chassis at FD.
“Use a 6-32 nut to mount the toroid coil onto
the chassis at FD. Be sure to orient the
coil so the center-tap lead is in the posi-
tion shown in the Pictorial. The other two
wires may exit the coil in positions that
are different from those shown.
we Cut the center-tap toroid coil lead to 4-1/4", if
this has not already been done. If the center-
tap lead has insulation, remove 1/4” of the
insulation from the end. If the lead does not
have insulation, cut a 4" length of sleeving and
slide it onto the lead. Now connect the lead to
switch SW1D lug 12 (S-1).
Connect the longer remaining toroid coil lead
(if the leads of your toroid are the same length,
use either lead) to switch SWID lug 11 (NS).
Cut the lead as necessary to reach the lug and
remove 1/4" of insulation from its end.
Connect the remaining toroid coil lead to the
bare wire that is connected between switch
SWID lug 1 and SWIE lug 1 (S-1). Cut the lead
as necessary to reach the lug and remove 1/4” of
insulation from its end.
RFC1: Cut both leads of a 2.5 mH RF choke to
1/2". Then connect one lead to switch SW1D lug
11 (NS). Position the choke as shown in the
Pictorial. Solder the other choke lead to the
switch frame in the indicated area.
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Heathkit
Cut a 1-3/4" medium bare wire. Use this wire
in the next step.
Refer to inset drawing #2 and pass one end of
the 1-3/4" bare wire through switch SWIC lug
7 (both lugs). Leave about 1” of wire extending
through the lugs (away from the chassis). Then
solder the other end of the bare wire to the
switch frame in the indicated area. Solder the
wire to both lugs at SW1C lug 7.
Refer to inset drawing #3 and cut a long #8
solder lug to 5/8". Then pass the narrow end of
the solder lug through switch SWIE lug 11
(both lugs). Solder the lug to both switch lugs.
INPUT FILTER CHECKOUT
Carefully inspect the input filter chassis for the
following most- commonly-made errors:
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Unsoldered connections. NOTE: Lug 11 of switch
SW1D will be soldered later.
Poor solder connections.
Protruding leads that could touch together, the
chassis, or other lugs to which they are not
connected.
Protruding leads and rotary switch solder co-
nnections that could touch the switch moun-
ting hardware.
This completes the assembly of the input filter.
Shake out any solder globs or other foreign matter
which may be lodged in the wiring. Then set the
filter aside until it is called for ina step.