Message-ID: <49FC75F6A7D2439197581F10016D72AE@AGB>
From: "Graham" <g8fzk@g8fzk.fsnet.co.uk>
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> <434E6E4F7AC64D8B995F684D832555DA@JimPC>
In-Reply-To: <434E6E4F7AC64D8B995F684D832555DA@JimPC>
Date: Fri, 24 Jul 2009 00:39:31 +0100
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Subject: Re: LF: Loop discussion
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Hi Jim,

One  disadvantage of a big loop is the (dc)  voltage it collects, the  600 
ft delta at gb4fpr has a habit
of producing quite big arcs' if its not  earthed ... and not  just a small 
one at  that!!.
 even on a fine sunny  day ..it may be simply wind-age or  perhaps ozone 
from the  sea,
 may also account for the very high noise level as well ..?

Being  surrounded by salt  water seems to be a  case of 'all that glitters 
in not  gold'

73 - G ..

Ps - Interesting topic .. may solve the  'problem'



--------------------------------------------------
From: "James Moritz" <james.moritz@btopenworld.com>
Sent: Friday, July 24, 2009 12:23 AM
To: <rsgb_lf_group@blacksheep.org>
Subject: Re: LF: Loop discussion

>
> 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
>
>
>



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