Heathkit SB-401 Assembly Manual page 53

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Detail 4-2F
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SOLOER----
•
,
Detail 4-2H
( ) At the end of th e prepared cable with the
most insulation removed from the inner lead,
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connect the inner lead to the BFO (8-1) and
the shield to the adjacent ground foil (S-1)
of the carrier generator circuit board.
Solder the shield directly to the foil ; identify
the location by the shape of the foil. Be
sure to use pliers on the shield as a heat
sink. The other end of the cable will be
connected later.
•
( ) Plac e. 5/8" of sleeving on each lead of a
15 tJ.H choke (#45-51). Connect this choke
from
J
(S-1) to the bottom of the terminal
pin at C
(8-1)
on the mixer-bandpass circuit
board. Wrap the choke lead around the
bottom of the terminal pin at C as shown in
Detail 4-2F.
( ) Refer to DetaiI4-2H, and prepare a 3" length
of coaxial cable as shown.
( ) Connect the red wire from hole 19 to lug 2
of coil
ex
(S-4).
( ) At the end of the prepared cable with the
shield lead, connect the inner lead to E (8-1)
and the shield to D (8-1) of the mixer-
bandpass circuit board. The other end of
the cable will be connected later.
( ) Pass one lead of a 430 pf mica capacitor
through lug 2 of coil CU (8-3) to lug 2 of
coil
ex
(NS). Use a 1" length of sleeving
on this lead. Connect the other lead t o
solder lug T (8-1).
( ) Refer to DetaiI4-2G, andprepare a 3 " length
of coaxial cable as shown.
Detail 4-20
( ) Connect one end of a
2-1/4'1
green wire to
lug 1 of the coil (S-2).
( ) Install the coil at CU.
( ) Connect a 50 pf mica capacitor between lugs
1 (NS) and 2 (NS) of a #40-768 coil.
( ) Install the coil at
ex.
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