Order Tray | Contact Us | Home | SIG Lists

[aprssig] Balloon DFing on APRS (test lines)

Andrew Rich vk4tec at tech-software.net
Fri Mar 2 22:19:36 UTC 2012

I could see google earth being used with an icon and a line drawn into direction of the target 

Sent from my iPhone
Andrew Rich

On 03/03/2012, at 5:14, "Bob Bruninga" <bruninga at usna.edu> wrote:

> Subject: Re: [aprssig] Balloon DFing on APRS (test lines)
>> I ONLY look for BRG/NRQ after a CSE/SPD Data Extension.
> Yes.  This was for mobile DFing, so assume it is always there.  But do not
> require there to be anything specific in that /000/000 field.  APRSdos puts
> in OBJECT in that location if it is an object.  So look for NRQ in its fixed
> location whether or not it has valid CSE/SPD data or not.
>> Q is a quality which governs the degree width of the wedge...
> Actually, The "quality" was simply intended to be on a subjective 1-to-9
> scale.  There is no way to define it much more precise than that.  The only
> reason we need an actual value is if you want to display a wedge.  But
> wedges are not at all well defined either.  RF does not have edges.  SO we
> usually define an antenna pattern by its 3 dB line, but this does not mean
> there are no signals beyond it.
> OK, lets go with 9 is one degree and back off from that as y ou suggest.
> But we must make it very clear to users that this stuff is all subjective...
> People have a better chance at remembering 1, 2, 4, 8, 16, 32, 64...
> But again, they really have no such data in most cases.  What they have is a
> gut feel as to how well their bearing line is.  On a scale of 1 to 9.  You
> can use your power=s of two to define the width of the wedges (that is what
> it was intended for) but we need to not let then people start taking these
> overlapping wedges and then trying to make *computational* assessments.
> Garbage in  garbage oiut.
> The value of the wedges is again, to display the sender's opinion as to his
> quality.
> Anyway, Glad to hear of your implementation!
> Bob, Wb4APR
> _______________________________________________
> aprssig mailing list
> aprssig at tapr.org
> https://www.tapr.org/cgi-bin/mailman/listinfo/aprssig

More information about the aprssig mailing list