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[aprssig] Balloon DFing on APRS (test lines)

Gregg Wonderly gregg at wonderly.org
Fri Mar 2 22:44:20 UTC 2012


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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