Re: Who has AGC... Fun Facts
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Schematic of the Radiola 64
From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of Jerry Gaffke via Groups.Io
Sent: Saturday, April 20, 2019 12:54 AM
Subject: Re: [BITX20] Who has AGC... Fun Facts
A curious tidbit about 1920's era radio:
They used to use a rheostat (a big honking pot) on the filament current to vary the gain.
A bit off topic, as I don't recall anybody closing the loop
by driving a servo motor to control that rheostat based on received signal strength.
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