[aprssig] APRS DF reporting

Wes Johnston, AI4PX wes at kd4rdb.com
Tue Nov 21 22:50:25 CST 2006

It would seem that for HF, the line should be 12,000 miles long.  For VHF 70
miles (mathematically adjusted for the altitude of the doppler station).
Seems like a starting point.


On 11/21/06, Bob Bruninga <bruninga at usna.edu> wrote:
> >> BUT TO SOMEONE ON any map scale larger than about
> >> the 8 mile range scale, my infinately long bearing
> >> lines looked like random OUTWARD bound bearing
> >> lines in all directions of the compass!
> >
> > This seems like a non-issue to me.  If there's
> > more than one report, anyone with any sense at
> > all will look at the intersection and not
> > the ends of the lines.
> Then I dont think you have seen what I am talking about.  There is no
> intersection at large maps scales.  All the bearing lines appear to be
> radiating outward.  As you say, "anyone with any sense" may see that as
> "typical garbage" from yet another person playing with their new doppler DF
> box and so will ignore the junk when maybe it is something he should look
> at.
> We dont want someone on a fox hunt in California with bearing lines
> crossing the USA into New York just because someone is looking at a map of
> the USA.
> I disagree, it is a very improtant issue.  Bearing lines have an estimated
> length relative to the knowledge of the person doing the bearing line.  That
> information must be included in the DF report.  Else it is just more well
> intentioned, but useless missinformation regurgitated onto APRS...
> de Wb4APR
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In theory there is no difference between practice and theory.
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