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[aprssig] Signal Locator WEB page

R. Simmons pelican2 at silcom.com
Thu Apr 26 17:57:40 UTC 2007

 From an outsider : IMHO I agree the DF abilities of APRS have not been
cultivated and are largely dormant. I have long salivated over the prospect
of an effective web-based display with multi-hunter APRS inputs. Last year I
succeeded in making a simple PIC-based device that generates APRS-compliant
DF messages, and tested it successfully. It was detected and plotted on
FINDU.com, but with no DF bearing line. I could pursue it further and easily
offer it as a finished product, but without a means of display, it would be
pretty pointless.

 Furthermore, I think hams generally don't co-operate on hunts, they compete
against each other, ( = social hunts for fun ) so the skills ( and
technology ) required for a co-ordinated "team hunt" never really get

Bob S.

----- Original Message -----
From: "Robert Bruninga" <bruninga at usna.edu>
To: "'TAPR APRS Mailing List'" <aprssig at lists.tapr.org>
Sent: Thursday, April 26, 2007 8:17 AM
Subject: [aprssig] Signal Locator WEB page

> WEB based APRS Direction Finder
> APRS has a rich set of Direction Finding tools that have not
> been implemented in many APRS clients.  As such, these powerful
> techniques are rarely used by most operators.
> However, if we had a WEB based Direction Finder DISPLAY system
> tied into the APRS-IS, then we would not only leverage the power
> of APRS DFing, but then ALL ham radio operators in the area
> could see the developing solution in real time and we would get
> 10 times as much data input!
> Please see the OMNI-Dfin technique in APRS:
> http://www.ew.usna.edu/~bruninga/dfing.html
> The web page would draw the map with the overlaping signal
> strength contours reported by APRS packets.  Browser based
> stations could also enter their report on the same web page and
> add to the display of contours.
> This narrows the area down very rapidly to a mile or so.
> Any takers?  It really does work.  And all it needs is input
> from people that have or HAVE NOT heard the signal.  A reliable
> NOT-HEARD report is even more valuable than a heard report,
> because it blacks out a larger area of where the signal
> cannot-be.  Enough of these, and you can eliminate so much area,
> that it is easy then to focus mnore carefully on where the
> signal may be.
> I sure wish I knew how to write active web pages like that. TO
> me, this would be the biggest asset for HAM radio 3rd to
> tracking, and Weather on APRS.
> Bob, WB4APR
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