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Author Topic: Air variable capacitor for AM reception antenna.  (Read 796 times)

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Offline Delawhere Jack

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Air variable capacitor for AM reception antenna.
« on: December 18, 2015, 06:34:24 PM »
Not even remotely related to forestry or milling.... but, thought I'd ask.

I'm looking for a tuning capacitor approx. 15-365pf range to use in building a loop antenna for picking up AM radio (500-1600 +/- khz). These are the type used in old pre-transistor type radios. They consist of a shaft that the tuning dial was attached to, and have a series of half circle metal plates attached that rotate through another set of stationary plates. (But then if you know what an air variable capacitor is, you didn't need a description  :D).

Not necessarily looking for top shelf quality, but if you've got one you'd part with cheap..... :)

Looking to get something between $10-20. I'll pay shipping of course.

Thanks,
John


Offline landscraper

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Re: Air variable capacitor for AM reception antenna.
« Reply #1 on: December 18, 2015, 07:20:48 PM »


Like these?  They are both Hammarlunds.  A MC-50-SX and a MC325M.  The part number is the center of the tuning range in Pf I think.  I'm sure I had big plans for something when I saved them, but since I can't even remember where I got them much less what for, they will probably do you more good than they will me.  If you would like them you are welcome to them at no charge, PM me an address and I'll send them to you.

Firewood is energy independence on a personal scale.

Offline Delawhere Jack

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Re: Air variable capacitor for AM reception antenna.
« Reply #2 on: December 18, 2015, 07:25:15 PM »
Sending a PM now. Thanks!

Offline landscraper

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Re: Air variable capacitor for AM reception antenna.
« Reply #3 on: December 22, 2015, 03:58:52 PM »
I sent the capacitors out today - shipping was $5.00 - just make a donation for that amount to the FF if that suits you.

Good luck with the antenna.
Firewood is energy independence on a personal scale.

Offline Delawhere Jack

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Re: Air variable capacitor for AM reception antenna.
« Reply #4 on: December 26, 2015, 06:26:35 PM »
Writing the check to FF now.

Thanks again.

Offline landscraper

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Re: Air variable capacitor for AM reception antenna.
« Reply #5 on: December 27, 2015, 11:50:49 AM »
Happy to help, and good luck with the AM dx'ing - maybe you'll hear something a little further than 60 miles  ;) if the conditions are right.  Cold winter nights make for some good listening.
Firewood is energy independence on a personal scale.


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