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Wiring the Set
369
< Wire
FIG. 5
The meaning of
winding "over
three, under
three"
MOUNTING
A FTER the eleven plate "^ •**• condenser has been
assembled (in many cases it can be bought complete for the total cost of its parts), it is mounted on the L panel by the three screws
i provided for this purpose.
If the holes in the panel ' are not quite properly
0 spaced, they can be reamed
slightly to compensate for any discrepancy. The dial ! is adjusted so that zero is
J at the top of the panel (at
L which point an indicating
line may be inked in) when -_ Snokes the rotary plates are entirely out.
The bushing for the switch lever and the four switch points are secured in their proper places. The crystal detector stand is mounted with a single screw through the center, two small holes on the right hand side being provided for the leads.
The remaining parts of the receiver, the fixed condenser and the coil, are supported by the wiring in back of the panel.
WIRING THE SET
THE internal connections of the set are shown in the diagram Fig. 2. Small "a" is the antenna post (upper left from the front) running to the top of coil L, to one side of the condenser, and to the crystal detector. The lower terminal and taps of the coil are connected as described. The bushing of the switch lever is wired to the ground post -"b" (lower left) and to the variable condenser
and telephone receiver post (lower right) "d". The upper telephone post runs to the crystal detector. The fixed condenser, C2, is connected across the phone binding posts, "c" and "d." Figs. 7 and 8 are rear and front views of the completed receiver. The connections within the set may be made with what wire is left over after winding the coil. The writer, however, had some No. 18 bell or annunciator wire, which, being larger and stiffer, was a bit better for this purpose. Using the parts photographed and described, no soldering was necessary.
THE telephone receivers are connected to the posts provided for them. The antenna is connected to "a" and the ground to "b." The lightning arrester, LA, is connected between antenna and ground as shown. The lightning arrester is conveniently mounted on the windowsill. The antenna wire should not be smaller than No. 14 B & S gauge, or its equivalent in stranded wire, and this same large wire should be used for the heavy leads shown in Fig. 2.
3 ^"Overall Diam.
FIG.
A pattern for the coil form.
. . r This may be cut out and
pasted on cardboard so that it can be duplicated exactly