Return to KLUBNL.PL main page

[Top] [All Lists]

Re: VLF: A single turn RX loop for VLF

To: "[email protected]" <[email protected]>
Subject: Re: VLF: A single turn RX loop for VLF
From: Lubos <[email protected]>
Date: Wed, 27 Apr 2016 17:30:39 +0000
Accept-language: cs-CZ, en-US
Authentication-results: spf=softfail (sender IP is;; dkim=none (message not signed) header.d=none;; dmarc=fail action=none;
In-reply-to: <[email protected]>
References: <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]>,<[email protected]>
Reply-to: [email protected]
Sender: [email protected]
Thread-index: AQHRoKksTrpb9SciJUG3z+StZe3gY5+eEfox
Thread-topic: VLF: A single turn RX loop for VLF
Hello Stefan and Wolf!
I used to try single-loop antenna some years ago. It worked well.


Lubos, OK2BVG

Od: [email protected] <[email protected]> za 
uživatele Wolfgang Büscher <[email protected]>
Odesláno: 27. dubna 2016 19:11
Komu: [email protected]
Předmět: Re: VLF: A single turn RX loop for VLF

Hello all,

I can confirm such a single-turn loop with a big ferrite transformer
works well - even with a very simple amplifier.
Construction details and a few spectrograms at :

(this 'ferrite cylinder' can frequently be seen at hamfests, but none of
the dealers could tell who actually made them, and what their original
purpose was..)

    Wolf .

Am 27.04.2016 um 18:31 schrieb DK7FC:
> Hi VLF,
> Today i've installed a second loop into the tree. It is a simple
> copper tube having 10 mm diameter and about 4m length.
> The loop is not resonated. The ends are just hold together with a screw.
> It is a very stable / robust construction which needs no further
> elements to hold it into the tree.
> The screw is protected against rain with some bonding tape. Before the
> mounting, a ferrite transformer with Al ~ 6000 nH was put on the tube.
> First i tried 20 secondary turns.
> Later i choose 40 turns and finally 80 turns.
> The results between the N-S loop and the E-W loop are still visible at
> DHO38 is much weaker, the Alphas are much stronger, HWU is stronger.
> All in all it appears that this loop performs better then my 80 turn
> hula hup circle loop (0.8m diameter). And by using the transformer it
> can be adapted optimally to the preamp input impedance. It even works
> down to 100 Hz, with limited performance of course.
> I'm now looking forward to receive something from the East or West. Is
> there someone out there ready to radiate a signal?
> Also, a VLF RDF grabber would be fine, maybe even by using idenetical
> antennas (to be built).
> 73, Stefan
> PS:
> BEWARE: This is not new! Someone has done it before, maybe even in the
> 1920s. VLF receptions on the Dreamers Band were done with such a loop
> for example by F5WK
> (

Attachment: Single-loop_scheme.JPG
Description: Single-loop_scheme.JPG

<Prev in Thread] Current Thread [Next in Thread>