Message-ID: <3A53BCBE.706C84C1@usa.net>
Date: Thu, 04 Jan 2001 00:58:54 +0100
From: "Alberto di Bene" <dibene@usa.net>
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To: rsgb_lf_group@blacksheep.org
Subject: Re: LF: Gyrators
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"'Geri' Kinzel, DK8KW" wrote:

> Alberto    I2PHD,
>
> Alberto, first of all thanks for providing ARGO, I have played around with
> it and found it very useful.
>
> About the coils on 9 kHz: I am using a u-shaped core with a closing bar on
> top made of ferrite material (special thanks to Markus, DF6NM). Using this
> setup I have a coil wit 1 H (one Henry) inductivity, lifting the ferrite
> bar on top by means of a screw some tenth of a millimeter I can fine-tune
> this coil between about 0.5 and 1 H. With 10 Watts output I achieve a
> current of roughly 130 mA into my 18m vertical ... sufficient for about
> 770m distance ...
>

Hello Geri,
                   thanks.
Funny, the two extremes of the spectrum have the same problems of detection
of signals below the noise.
I was reading a couple of days ago about the experiments done by John K3PGP
using a modulated laser light, aimed at the sky.  He says that it was possible to
receive the scattered light and to recover the modulation at 25 km distance...
impressive.  This looks as another possible field where QRSS and/or DFCW
could be of help....

73   Alberto   I2PHD