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Re: VLF: Joe on DX

To: [email protected]
Subject: Re: VLF: Joe on DX
From: [email protected]
Date: Thu, 14 May 2015 23:34:49 -0230 (NDT)
In-reply-to: <[email protected]>
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Hi Stefan,

30 watts from an audio amp is stepped up with a 1:4 ferrite xfmr.
One end of the secondary is grounded, the other goes to  2 pie
coils wound with 3 strands of 0.08mm wire, L~450 mH R(DC)=437

The 100m wire is about 12 m average height and the aerial current
is about 20mA, with a large uncertainty.  5 km is the best DX,
with about 10dB S/N at 3.3km.

I recall Markus or you posted the maths for erp vs natural noise
on 8 kHz. A reminder would be most helpful!

The 10k race was most gratifying even if I couldn't catch my
pretty little physiotherapist!

73 & TNX

On Fri, 15 May 2015, DK7FC wrote:

R Joe, thanks.

Now, what is your setup on VLF? Are you using a 100m wire which you are using for LF/MF as well?
What is the effective height and what is the antenna current? How do you
couple the TX to the wire and what is the output power?
73, Stefan

Am 15.05.2015 00:29, schrieb [email protected]:

Your VLF probe design works well -- but sadly the 36km photons
remain elusive.


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