This was a most unusual early radio design

boomer#6877250 · 2015-12-15T00:20:14+00:00

This was a most unusual early radio design. Rather than change channels using a variable capacitor, they used variable inductors. Quite unique. On thing about those old radios, they always had HUGE coils. Even those that tuned using a capacitor. Apparently they would all coils by hand back then, and could not wind small ones like they used in later model radios. Not to mention they did not use ferrite cores like later radios. When I was a kid, I had some of those old HUGE coils that someone gave me, along with other very old electronic parts. I wish I still had them....

Dec 15, 2015 61 Replies

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Phil Hobbs 10 years ago

That is pretty cute, especially combined with DDS for the vernier. You can do a lot with offset PLLs.

Cheers

Phil Hobbs

Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC Optics, Electro-optics, Photonics, Analog Electronics 160 North State Road #203 Briarcliff Manor NY 10510 hobbs at electrooptical dot net http://electrooptical.net

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Tauno Voipio 10 years ago

The idea is older - have a look at Barlow-Wadley XCR 30 or Racal RA-117.

-TV

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