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Message-ID: <434E6E4F7AC64D8B995F684D832555DA@JimPC>
From: "James Moritz" <james.moritz@btopenworld.com>
To: <rsgb_lf_group@blacksheep.org>
References: <1MTixd-0cGXyK0@fwd00.t-online.de>  <4A687388.4050801@usa.net>  <D4AD27687AE04388BC1A8867F5C27617@JimPC> <1MU4lz-1dRfeq0@fwd10.t-online.de>
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Date: Fri, 24 Jul 2009 00:23:53 +0100
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Subject: Re: LF: Loop discussion
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Dear Ha-Jo, LF Group,

The beauty of a large wire loop of several m^2 is that a high signal level 
is produced, making tuning and matching non-critical, and so it is a very 
simple and versatile antenna which works well over a wide frequency range. 
My version of an outdoor wire loop tunable in the shack was the "Lazy 
loop" - see http://www.wireless.org.uk/lazy.htm

When you are trying to make a much smaller loop with essentially the same 
performance, design is more critical due to the lower signal power available 
from the loop, so the technical details need to be studied, and the solution 
has to be more closely defined. But the end result is still simple - a 
single turn loop, a transformer, a preamp. In the case of the bandpass 
loops, a few inductors and capacitors do impedance matching and define the 
passband. It is worth going to this trouble, because a compact, portable, 
easily rotated loop that does the same job as a much bigger antenna is a 
useful thing to have.

Cheers, Jim Moritz
73 de M0BMU

----- Original Message ----- 
From: <hajo.brandt.dj1zb@t-online.de>
To: <rsgb_lf_group@blacksheep.org>
Sent: Thursday, July 23, 2009 9:20 PM
Subject: Re: LF: Loop discussion


> Dear James and Alberto,
>
> I must confess that my considerations were much simpler. I wanted to
> find a solution for an outside wire (normal litz wire for electric home
> wiring) loop for broadband reception and to transfer its received energy
> into the shack via a cable. Especially at VLF to MF cable losses are
> rather low. Furthermore I wanted to locate all electronic equipment in
> the shack only, no remote controls or similars. My solution is simple
> and is working according to my expectations.
>
> 73 Ha-Jo, DJ1ZB