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Re: R: LF: TXing WSPR/MF on an indoor loop

To: [email protected]
Subject: Re: R: LF: TXing WSPR/MF on an indoor loop
From: N1BUG <[email protected]>
Date: Sat, 26 Jan 2019 07:02:39 -0500
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Hi Stefan,

Congrats on your results with the small indoor loop!

> The limiting factor in that system is the capacitor! I use 2.2 nF +6.8 
> nF + 1090 pF variable C. Maybe it can be optimised by using 10 x 1 nF 
> WIMA-FKP-1-2000. The voltage is about 450 V, which is well below the 700 
> V limit.

You may want to take a close look into the WIMA data sheet. There
are charts showing maximum permitted Vrms vs. frequency. I think you
may find the 1 nF 2000VDC / 700VAC FKP is derated to around 300 Vrms
at 475 kHz. I had some experience destroying these things... :-)

73,
Paul

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