Order Tray | Contact Us | Home | SIG Lists

[aprssig] Signal Locator WEB page

Robert Bruninga bruninga at usna.edu
Thu Apr 26 21:57:46 UTC 2007


Well, here is the ideal PIC OMNI-DF project in my opinion:

1) an OMNI-DF-on-air request goes out by someone with jamming
2) The Request contains the jammed freq
3) The PIC tunes a D7 or D700 or any other radio to listen
4) The pic notes the signal strength (or none)
4) The pic responds with an OMIN-DF packet

The REQUESTOR now then has on his display (APRSdos, or XASTIR)
the signal reports he needs, and the display shows the
overlapping OMNI-DF reports for instant assessment.  Done.  But
then who has all those cat-capable radios to put around the
county.  Are there any cheap scanners that can be PIC
controlled?

Bob, WB4aPR

> -----Original Message-----
> From: R. Simmons [mailto:pelican2 at silcom.com] 
> Sent: Thursday, April 26, 2007 1:58 PM
> To: bruninga at usna.edu; TAPR APRS Mailing List
> Subject: Re: [aprssig] Signal Locator WEB page
> 
>  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
> developed.
> 
> 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
> >
> >
> >
> >
> >
> > _______________________________________________
> > aprssig mailing list
> > aprssig at lists.tapr.org
> > https://lists.tapr.org/cgi-bin/mailman/listinfo/aprssig
> >
> 
> 





More information about the aprssig mailing list