[Boatanchors] Plug in coils
Al Klase
ark at ar88.net
Fri Jul 19 12:15:49 EDT 2013
Hello Preston,
I believe plug-in coils came about in the mid-1920's with the move to
shortwaves (HF). The earliest example I can cite is the RCA AR-1496
TRF-autodyne receiver which covered 4 shortwave bands from about 3.5 to
24 MHz. The coils are mounted horizontally on rectangles of Bakelite
that hold pin jacks to engage pin plugs in the radio.
There's a long homebrew tradition of gluing cylindrical things to
discarded tube bases, or using just a tall tube base for higher frequencies.
Oops. Found one a year earlier. Grebe CR-18. See:
http://www.stonevintageradio.com/description.php?II=61&UID=20130719091421
Al
On 7/19/2013 10:22 AM, Preston Clark wrote:
> Hello group I am reading surviving technology and I have seen on eBay the coils of certain bands that plug into the radio. I am curious when did these start and how hard are they to make from scratch 73 Preston kf5evv
> Sent from my iPhone
> ______________________________________________________________
>
--
Al Klase - N3FRQ
Jersey City, NJ
http://www.skywaves.ar88.net/
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