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34
Radio Broadcast
Rear view of reflex and two step using honeycombs. Amperite resistances have been used in place of rheostats
coil which acts as an insulating layer between the two windings. The cardboard also loosens the coupling, increasing the selectivity of the set.
The 1 5 and 35-turn primaries are now wound over the secondaries. The 1 5 turns present no problem whatever. However, due to the narrow winding space, the 35-turn primary must be single bank-wound. Details on bank-winding will be found in the Grid department of the February RADIO BROADCAST.
The reader may find it easier to make the primary windings, by building up the winding "form to the correct size, and slipping it over the secondary when wound.
The completed reflex (Fig. i) plus two stages
audio was constructed in accordance with the instructions outlined in the February RADIO BROADCAST. The anti-squeal condenser is a .001 mfd. Dubilier Micadon. However, a larger panel, 7" x 18" was used. This permits a nicer layout, with less cramping of instruments. The panel working drawing is shown in Fig. 3. The base is 17!" x 6f" x f ". The sockets are spaced three inches between centers, as are the jacks. Thirteen-plate, or .00025 mfd. variable condensers were used, with four-inch dials. Due to the size of the panel, it was thought better to support it by brackets, rather than permit the entire strain to be taken up by the rigid wiring and the screws into the base. The brackets were made from brass strips,
FIG. 2A