Hello Alberto and all,
they choose this exotic transistor because of its extreme linearity.
73 Peter, dj9dw
----- Original Message -----
From: "Alberto di Bene" <[email protected]>
To: <[email protected]>
Sent: Friday, January 20, 2006 12:49 AM
Subject: LF: Re: Mini Whip and local noise
[email protected] 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
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