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 Post subject: Can anyone ID this early coil?
PostPosted: Jan Sun 08, 2017 10:22 pm 
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Joined: Feb Fri 25, 2011 12:57 am
Posts: 1977
Location: 08033 Cherry Hill Jersey
I know I've seen these around, and can't recall if this a spark gap xmitter part or what.

Any help is appreciated.
cheers

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 Post subject: Re: Can anyone ID this early coil?
PostPosted: Jan Mon 09, 2017 10:05 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 484
Location: Louisville, Ky.
Looks like part of an RF transformer and could have been used on a spark transmitter to couple the output of the tank circuit to the antenna. Typically there would be two of these coils, with one mounted on a hinge so that the coupling between the two could be adjusted.

Mike


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 Post subject: Re: Can anyone ID this early coil?
PostPosted: Jan Mon 09, 2017 11:56 pm 
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Joined: Jun Fri 19, 2009 6:34 pm
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Location: Long Island
It's certainly an early transmitter coil, but one cannot identify it as definitely spark. It could have been used with a spark, arc, or an early tube transmitter for that matter.

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 Post subject: Re: Can anyone ID this early coil?
PostPosted: Jan Tue 10, 2017 6:09 pm 
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Joined: Jan Thu 01, 1970 1:00 am
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Location: Perrysburg, OH, U.S.A.
I wonder what the inductance is. When I saw the picture my first thought was, "Wouldn't that make for a cool looking crystal set!"

John

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 Post subject: Re: Can anyone ID this early coil?
PostPosted: Jan Tue 10, 2017 7:58 pm 
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Joined: Nov Sun 04, 2007 6:01 am
Posts: 2694
Location: Redding, CA
Sure. It is the outside coil of a Murdock oscillation transformer...

http://www.stonevintageradio.com/descri ... 0110185711

Norman

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