Heathkit SG-8 Assembly And Operation Manual page 8

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SWITCHES
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Page 6
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Mount a 9-pin miniature socket Ron the sub ­
chassis, using 3-48 screws and nuts. Posi ­
tion as shown in Figures 1 and 2.
Figure 3
Mount the tuning condenser as shown in Figures 1 and 2, using 3/16 6-32 Screws with lock ­
washers under the heads.
( ) Mount a cable clamp on the bottom mounting
screw of coil A as shown in Figure 2, using
an additional 6-32 nut to secure it.
Mount two 6-32 spade bolts on the sub-chas ­
sis aprons as shown in Figure 2. Method of
mounting is shown in Figure 3.
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HOW TO
Figure WIRING THE SUB-CHASSIS
NOTE: Before beginning the wiring, refer again to the notes on wiring and soldering on the in ­
side rear cover of the manual. We cannot stress too strongly the importance of careful wiring
and soldering when applied to radio frequency circuits. In building this signal generator you
will use a considerable amount of bare wire. Care should be taken to avoid possible shorts to
the chassis or other components. The leads should be kept short and straight when possible.
Soldering should be done with a great deal of care, so that fluxes will not run over onto adjacent
insulation, thus causing leakage and a possible source of trouble.
Figure 4
) Referring to Figure 4 for coil identification, and Figure 1 for coil position, mount the coils
A, B, C and D. Referring to Figure 2, note that coil C has a 3-lug terminal strip mounted
on its lower mounting screw, and coil A has
a solder lug on its upper mounting screw .
Use lockwashers on all coil mounting screws
except the one having the solder lug.
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Components are given code designations so that the identification of parts on both the diagrams
and on written matter is easily defined. The switch terminals are numbered in such a manner
that if the switch were viewed from the front, the numbering system would progress in a clock ­
wisedirection around the switch. The band switch sections are referred to asBForBR, corre ­
sponding to the front and rear sections of the switch when viewed from the shaft end. The tube
sockets are also numbered in a clockwise direction, as viewed from the bottom, starting from
the gap between the socket terminals. Thus a reference to R4 refers to the number 4 terminal
on socket R, counted from the first terminal to the left of the open space between terminals 1
and 9 on that particular socket. In wiring the sub-chassis, reference to Pictorials 1 and 2 will
illustrate the placement of all parts and leads.
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MOUNT CONTROLS &
Mount the band switch B, using a control lockwasher and control nut. Omit the flat washer.
Position as shown in Figure 2. See Figure for method of mounting controls.
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