[aprssig] Balloon DFing on APRS (test lines)
Lynn W. Deffenbaugh (Mr)
ldeffenb at homeside.to
Fri Mar 2 18:52:50 EST 2012
Filter would be s/\/ to pick up the \ symbol in the primary table which
is the DF Triangle. However, you'll only see the DF wedge if something
between the APRS-IS and Google Earth actually parses and renders the
BRG/NRQ piece of the packet.
Lynn (D) - KJ4ERJ - Author of APRSISCE for Windows Mobile and Win32
On 3/2/2012 5:44 PM, Gregg Wonderly wrote:
> My KML server application, aprskml.dev.java.net, will do this for you
> if you provide the appropriate filter. It will listen to the aprs-is,
> and provide a KML stream that you can point google earth at.
>
> Gregg Wonderly
>
> On 3/2/2012 4:19 PM, Andrew Rich wrote:
>> 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
>> _______________________________________________
>> aprssig mailing list
>> aprssig at tapr.org
>> https://www.tapr.org/cgi-bin/mailman/listinfo/aprssig
>>
>
>
> _______________________________________________
> aprssig mailing list
> aprssig at tapr.org
> https://www.tapr.org/cgi-bin/mailman/listinfo/aprssig
>
More information about the aprssig
mailing list