Envelope-to: dave@picks.force9.co.uk
Delivery-date: Fri, 20 Jan 2006 10:11:18 +0000
Message-ID: <000901c61dac$20298450$ee9bfea9@oben>
From: "dj9dw" <dj9dw@t-online.de>
To: rsgb_lf_group@blacksheep.org
References: <NKEMLGOEKANPNJOBFBAFGEKDCJAA.g4wgt@tiscali.co.uk>	<016101c61d02$12ceca40$2101a8c0@pcroelof> <43CFCE5D.5000504@usa.net> <20060119232216.u1kyilxv57r4scgg@webmail.versatel.de> <43D0258B.2000601@usa.net>
Date: Fri, 20 Jan 2006 11:27:33 +0100
Subject: LF: Re: Re:  Mini Whip and local noise
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Hello Alberto and all,
they choose this exotic transistor because of its extreme linearity.
73 Peter, dj9dw

----- Original Message ----- 
From: "Alberto di Bene" <dibene@usa.net>
To: <rsgb_lf_group@blacksheep.org>
Sent: Friday, January 20, 2006 12:49 AM
Subject: LF: Re: Mini Whip and local noise


> uwe-jannsen@versanet.de wrote:
> >
> > Hi Alberto,
> > do you have a description of the Amrad E-field probe?
> > I cant find it on the net.
> > Regards
> > Uwe/dj8wx
>
> Hi Uwe,
>
>   probably you haven't found it because it is referred to as
> "Amrad active antenna".
> Here is the PDF file describing it :
> http://www.arrl.org/tis/info/pdf/0109031.pdf
>
> and here you can find some notes by Amrad on it :
> http://www.pacificsites.com/~brooke/LF-Ant.shtml
>
> It uses a rather unusual power FET as active device, the
> Crystalonics CP666. A few have built it using a couple
> of U310 in parallel, at the maximum drain current compatible
> with the max dissipation, and with the supply voltage
> reduced from 24 to 12V.
>
> If the Roelof's mini whip antenna performs similarly,
> then there isn't the need of searching for the (expensive)
> CP666 FET.
>
> 73  Alberto  I2PHD
>
>
>
>