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Re: Re: LF: TXing WSPR/MF on an indoor loop, part 2

To: "RSGB LF group"<[email protected]>
Subject: Re: Re: LF: TXing WSPR/MF on an indoor loop, part 2
From: "dhchurch"<[email protected]>
Date: Thu, 31 Jan 2019 10:54:42 +0000
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Hello Dimitrios
 
Polypropylene capacitors can actually self-heal to such an extent that there's little left of them. The melting point of polypropylene is not very high and they can end up as just a liitle blob of plastic. 
 
Don't worry though, I still use them suitably rated for the frequency in use and most of them are 600Vac or more.
 
73, Hugh, M0DSZ
----- Receiving the following content -----
Receiver: rsgb_lf_group
Time: 2019-01-31, 00:25:55
Subject: Re: LF: TXing WSPR/MF on an indoor loop, part 2

Hi Stefan,

In my experience these polypropylene capacitors when they fail, they
just lose some capacitance. I think they call it 'self healing', maybe
they imply that when they fail there is no short circuit?

I have some really nice silver mica capacitors (ex MW broadcast stuff)
that would be perfect for this task...

Anyway, I am slowly gearing up for some VLF action over here. The
other day I did some tests at 16.72 kHz into an ugly loop (very
roughly 120 metres by 3 metres, single turn) and I was able to receive
my signals using an unoptimise ferrite antenna at a bit over 2 km from
the TX. I don't think I am in the near field at that distance, am I?
:-)

73, Dimitris VK2COW

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