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Direction Finder

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Toyo Cheng

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Apr 21, 1994, 2:13:06 PM4/21/94
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Dose anybody has experience of making the Doppler direction finder??
Which has 4 or 8 fixed vertical antennas, and gives bearing of 360 degrees
in digital with 1 degree precision??

I am thinking to make one for my experiment. Although it is quite popular
in communication field, such as FAA(for air crafts) or police(Lo-Jack), I
could not locate any article or source of a Doppler Radio Direction Finder.

If you know something about this, please let me know!! Is any article
available on a certain magazine, electric book(?) on internet or diagrams of
it??

Your advise, comment, and anything related to a Doppler Directional Finder
will be greatly greatly greatly appreciated!!
Again, thank you very much in advance!!

to...@bu.edu
in Boston

Rick Walker

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Apr 21, 1994, 10:27:33 PM4/21/94
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In rec.radio.amateur.homebrew, to...@bu.edu (Toyo Cheng) writes:

> If you know something about this, please let me know!! Is any article
> available on a certain magazine, electric book(?) on internet or diagrams of
> it??

Look for an article on the "Dopplescant" system in an old QST circa
~1976. I believe that one of the ARRL handbooks had a section on it
also.

--
Rick Walker

HILLIER, MARK D.

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Apr 22, 1994, 10:07:00 AM4/22/94
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In article <2p6fni$4...@news.bu.edu>, to...@bu.edu (Toyo Cheng) writes...

>Dose anybody has experience of making the Doppler direction finder??
>Which has 4 or 8 fixed vertical antennas, and gives bearing of 360 degrees
>in digital with 1 degree precision??
>
>I am thinking to make one for my experiment. Although it is quite popular
>in communication field, such as FAA(for air crafts) or police(Lo-Jack), I
>could not locate any article or source of a Doppler Radio Direction Finder.
>
>If you know something about this, please let me know!! Is any article
>available on a certain magazine, electric book(?) on internet or diagrams of
>it??

The book "Transmitter Hunting: Radio Direction Finding Simplified" By Joe Moell
K0OV and Tom Curlee, WB6UZZ (TAB books ISBN 0-8306-2701-4) has a large section
on this topic. They talk extensivly about the Roanoake Doppler which is supposed
to be pretty good for the money. A second source is of course the ARRL handbook
(No ham should be without one).

Good Luck

-Mark Hillier Internet: MD_...@pavo.concordia.ca
Amateur: VE2HVW
PACKET: VE2HVW@VE2FKB
" I hear, I forget. I see, I remember. I do, I understand"

Tom Bruhns

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Apr 22, 1994, 11:46:21 AM4/22/94
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Rick Walker (wal...@opus.hpl.hp.com) wrote:

: Look for an article on the "Dopplescant" system in an old QST circa


: ~1976. I believe that one of the ARRL handbooks had a section on it

May, 1978, QST. I have one, with an additional antenna for 440. Works
OK, but not to 1 degree precision; the signals are _never_ that good
anyway. I can provide copies of the article for a SASE plus an extra
29 cent stamp; email me if interested.

73, K7ITM -- Tom

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