Re: HIGH Q CAPS FOR VLF LOOP ANTENNA?

<TRABEM> wrote in message news:7l2ml1p4e9mjunf4ho30hd6uoj4e25756q@xxxxxxxxxx
> What caps should I use for a resonant loop antenna for VLF? I have
> some antenna plans and need .2 uf total capacitance to resonate a loop
> antenna at 60 Khz.
>
> I know I should avoid electrolytic and tantalum due to their poor
> temperature stability.
>
> Disc ceramics are so poor thermally that they are out of the question,
> especially since the caps are going to be outdoors.
>
> Silver Mica's are horribly expensive these days, and aren't available
> much past .01uf anyway.
>
> I have a Mouser catalog and plan to order from them soon, but it's not
> clear which type of cap I should order.
>
> Any suggestions for 50,000 pF caps that don't cost a fortune?
>
> Note that this is a receive only antenna so voltage rating and current
> carrying capacity are not an issue.
>
> Thanks.
>
> T

Polystyrene caps are very temperature stable, typically changing only 0.5%
over their full temp range. And they're available in high capacitance
values. Check Mouser and Digikey for good prices.
--
Dave M
MasonDG44 at comcast dot net (Just substitute the appropriate characters in
the address)

Never take a laxative and a sleeping pill at the same time!!


.

Relevant Pages

  • Re: HIGH Q CAPS FOR VLF LOOP ANTENNA?
    ... > What caps should I use for a resonant loop antenna for VLF? ... You would need a very good capacitance ...
    (rec.radio.amateur.antenna)
  • Re: High Q caps for 60 Khz loop antenna?
    ... some antenna plans and need .2 uf total capacitance to resonate a loop antenna at 60 Khz. ... especially since the caps are going to be outdoors. ...
    (rec.radio.amateur.homebrew)
  • Re: High Q caps for 60 Khz loop antenna?
    ... some antenna plans and need .2 uf total capacitance to resonate a loop antenna at 60 Khz. ... especially since the caps are going to be outdoors. ...
    (rec.radio.amateur.homebrew)
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