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[aprssig] Balloon DFing on APRS (test lines)

Lynn W. Deffenbaugh (Mr) ldeffenb at homeside.to
Fri Mar 2 23:52:50 UTC 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
>>>
>>>
>>>
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