100-Radio-Hookups-EICO-1924

100 RADIO !IOOK-UPS
Fig. 85. A circuit employing a wave trap for the elimination
of an interfering station. When the wave trap is tuned to the
same wave length as the interfering station, its signals are choked
back, all signals of other wave lengths, however, can pass the trap
freely. For broadcast reception, L can be a D.L. 35 Honeycomb
coil and the variable condenser C be of .001 111.F. capacity. They
should be shielded from the other apparatus.
Ili +
22zV
Fig. 86 Fig. 87
Fig. 86. A circuit for the elimination of bothersome A.C.
hum and other interference of the same nature. C is an iron core
choke shunted by a .001 111.F. variable condenser. The correct
value for C can only be determined by experiment, as its size depends
on the frequency of the interference.
Fig. 87. A single circuit regenerative receiver with but two
controls; tuning and regeneration being accomplished by the movement
of coils A and C. Coils A and B should have about 60 turns
each and coil C about 35 turns. They can be wound in a pancake
form or in spider -web fashion, and placed in a suitable mounting.
Pis. 88
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