Didn't Birmingham use something similar to produce some very deep
notch filters when the Beagle disappeared ?
G..
--------------------------------------------------
From: <victor13@online.nl>
Sent: Saturday, October 01, 2011 7:59 AM
To: <rsgb_lf_group@blacksheep.org>
Subject: RE: LF: Ferrite RX antennas
Hi Stefan,
at the institute I am working we are using lithographic superconducting
coils with special NPO capacitors In the range from 100KHz to 5MHz Q up to
5000 is optained....
73
Victor
-----Oorspronkelijk bericht-----
Van: owner-rsgb_lf_group@blacksheep.org
[mailto:owner-rsgb_lf_group@blacksheep.org]Namens Stefan Schäfer
Verzonden: zaterdag 1 oktober 2011 0:00
Aan: rsgb_lf_group@blacksheep.org
Onderwerp: Re: LF: Ferrite RX antennas
Hello Jim,
Maybe liquid helium and a superconductor material? ;-)
73, Stefan
Am 30.09.2011 15:14, schrieb James Moritz:
Dear Mal, LF Group,
G3KEV wrote:
Some commercial produced coils encased in helium tubes had vy high Q
that would rival the ferrite variety used today.
Helium tubes? Sounds like a good way of separating unwary amateurs
from their money!
Cheers, JimMoritz
73 de M0BMU
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