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Subject: Re: More on HF DF (or ADF)
X-Newsreader: Forte Agent 1.91/32.564
Date: Tue, 12 Nov 2002 13:01:00 GMT
NNTP-Posting-Date: Tue, 12 Nov 2002 13:01:00 GMT
On Mon, 11 Nov 2002 12:38:57 -0800, Jim Weir wrote:
>That is no longer true. A good receiver chip that will amplify and limit the
>signal, producing a digital output, is the size of your thumbnail or smaller.
>Digital power is a nickel a gigainstruction or thereabouts. At any rate, it
>seems to me that there is a better way to DF or ADF (direct bearing readout) on
>an HF signal than motors and rotating coils. Ferrites and toroid techniques are
>available that we didn't even dream of in the old days.
>I've done a fairly exhaustive web search to see if this has been done before
>and have come up dry. However, my web search skills are not as honed as some in
>this group, I'm sure. Anybody got a pointer to a "how to" article on HF ADF
>using a small, fixed antenna?
Try a more particular search involving aircraft equipment. The ADF in an
aircraft covers the LF/MF range (about 190 to 1799.5 kHz) and can be used to
detect *known* MW/LW broadcast transmitter stations.
This is nearer to what you are asking than the VHF doppler-type systems.
A simplified explanation is on:-
an antenna at
But maybe I'm teaching the wrong guy?
quote "so I wrote Jim Weir, world-famous stealth-antenna designer. "
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