100-Radio-Hookups-EICO-1924

100 RADIO HOOK-UPS
h1I11N
45 f$ Pei FId. 81
Fig. 80
Fig. 80. This is the improved Flewelling super -regenerative
circuit. Coils 1' and T are those of a variocoupler rewound with
the correct number of turns. Switch F changes the circuit from
regenerative to super -regenerative at will.
Fig. 81. The Bishop Ultra Regenerator,
originator. It
named
is a
after its
simplified form of
in
the
its operation.
Flewelling and is superior
A variometer is employed
tion.
for
The
obtaining
Honeycomb
regeneracoil
D.L. 400 acts as a radio frequency choke.
SUPER HETERODYNE RECEIVERS
IWfo- alee, Mot nLewA'
7.47 AirnJ
Pf AA+r/orinns
Y</!? -'-.
® Fig. 82
4J76oYJ"
-011!11IN't1111UUUbü1,
Fig. 82. The well-known Armstrong Super -Heterodyne circuit.
This is mainly an improved form of radio frequency amplifier,
but has other advantages, such as simplicity of control, and
selectivity. The radio frequency transformers in this circuit are
designed to amplify at a wavelength of approximately 5,000 meters
and are not of the type employed in the usual radio frequency
amplifier. The constants of the apparatus are given in the diagram.
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