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Re: LF: Re: Mini-Whip Antenna

To: <[email protected]>
Subject: Re: LF: Re: Mini-Whip Antenna
From: "Clemens Paul" <[email protected]>
Date: Sun, 16 Jan 2011 14:13:07 +0100
References: <[email protected]> <op.vpan5am6yzqh0k@pc-roelof> <[email protected]> <op.vpat3gvlyzqh0k@pc-roelof> <04DC6D14A81F4542B1D2189A5440F3D5@DennisPC>
Reply-to: [email protected]
Sender: [email protected]

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" <[email protected]>
To: <[email protected]>
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.
...


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