[aprssig] "location changes too fast > 500 km/h"

Heikki Hannikainen hessu at hes.iki.fi
Mon Oct 12 23:47:57 EDT 2009

On Mon, 12 Oct 2009, Lynn W. Deffenbaugh (Mr) wrote:

> AH!  I think I begin to see!  Was that you "flying" houses and red dots 
> over the Atlantic?  In particular:
> g1 - A Home icon flying west and south-west.
> ccc - A Red Dot flying north-east
> cj - A Home icon flying north-east
> These three were all moving right around 1,000mph and stopped abruptly just 
> after 10:00 UCT this morning.

No - those were flown by DG4SEX-1, and I had nothing to do with them, but 
they provided nice testing material for the algorithm. They were doing 
1646 km/h and 1439 km/h. There were also 'asa' and and 'y'.


PS. There also some repeater antenna installation photos from Saturday at 
http://oh7lzb.blogspot.com/. We have an igate antenna on top of that 
100m mast.

> Lynn (D) - KJ4ERJ
> Heikki Hannikainen wrote:
>> On Sat, 29 Aug 2009, Keith VE7GDH wrote:
>>> Kriss KA1GJU wrote...
>>>> The KA1GJU-6 tracker will not show up properly on APRS.fi since my 
>>>> speeds are in excess of 500 kM/hr (270 kts) above 10,000 feet.
>>> Perhaps Hessu could tweak the settings on aprs.fi to remove the
>>> 500 kM/h limitation for stations using a plane/small plane symbol.
>> I've tweaked the algorithm now, and upped the hard limit considerably. 
>> aprs.fi should now work fine for civil aviation purposes, but there might 
>> still be issues with those of you with a scramjet or an SR-71/A-12. The 
>> solution isn't symbol specific.
>> http://oh7lzb.blogspot.com/2009/10/new-bad-gps-fix-detector-algorithm.html 
>> http://aprs.fi/?call=KA1GJU-6

   - Hessu

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