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[aprssig] IGATE delays

Curt, WE7U archer at eskimo.com
Tue Jun 7 19:25:37 UTC 2005


On Tue, 7 Jun 2005, Keith - VE7GDH wrote:

> Wes KD4RDB wrote on 07/06/2005
>
> > Guys, try to follow me on this one.... last night I noticed that my
> > track from driving home seemed to "ratchet" back and forth.
>
> I have observed this for stations just east of Vancouver BC. When
> I get a chance will look at some log files I had and one that was
> sent to me and try and pin down which of several IGates it could
> be. I suspected it could be the time being off at one of the
> IGates but haven't had a chance to spend look at it properly yet.
> I am one of the IGates involved, but my computer time is within a
> minute.

One of the reasons I backed my path for my mobile down was that
there were igates up there that were putting my packet into the
internet delayed, which combined with the igating down near Seattle
made my path all screwy.  By shortening my path I avoided a lot of
that.

It shouldn't be a time-setting on the computer that's the problem,
as Xastir (what I was monitoring with via an internet connection)
and findu.com ignore the timestamps.  It's a delay in feeding the
packet to the internet.  Whether that's an RF delay or a computer
processing delay, I can't tell.

--
Curt, WE7U.   APRS Client Comparisons: http://www.eskimo.com/~archer
"Lotto:    A tax on people who are bad at math." -- unknown
"Windows:  Microsoft's tax on computer illiterates." -- WE7U
"The world DOES revolve around me:  I picked the coordinate system!"




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