Message-ID: <015d01cbb57f$1feb9d00$0201a8c0@Clemens04>
From: "Clemens  Paul" <cpaul@gmx.net>
To: <rsgb_lf_group@blacksheep.org>
References: <F34AE1C11C9F44D2950EC49C5A2196A6@gmc.net> <op.vpan5am6yzqh0k@pc-roelof> <4D7062BE2D504CA4A55BDE1C7103CF31@gmc.net> <op.vpat3gvlyzqh0k@pc-roelof> <04DC6D14A81F4542B1D2189A5440F3D5@DennisPC>
Date: Sun, 16 Jan 2011 14:13:07 +0100
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Subject: Re: LF: Re: Mini-Whip Antenna
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Dennis,

if the loop-preamp system is well balanced the loop doesn't need
screening.
E.g. the Wellbrook ALA1530 broadband loop is unshielded.
Therefore its preamp is a push-pull design.

73
Clemens
DL4RAJ


----- Original Message ----- 
From: "DENNIS EASTERLING" <dennis.easterling@btinternet.com>
To: <rsgb_lf_group@blacksheep.org>
Sent: Sunday, January 16, 2011 11:15 AM
Subject: Re: LF: Re: Mini-Whip Antenna


> Dear Roelof and Petr
>
> When I first tried the mini-whip I was very sceptical of its 
> performance,
> but in my circumstances, living surrounded by houses and near a main 
> line
> electric railway ((25kV) it has performed very well indeed.
>
> I tried tuned loops of various sizes but the qrm is overwhelming in 
> such
> close quarters to the switched mode power units and machines 
> operating in
> nearby houses.   Out of various loops, the wide band untuned 
> screened loop
> seemed the best option, with a simple 1m loop of co-ax cable and 
> amplifier
> tied to the back fence and the Wellbrook ALA1530 giving similar 
> performance
> at MF, although the Welbrook is better engineered and mounted on a 
> rotator.
...