[aprssig] GPS Epoch Rollover Findings

Matthew Chambers mchambers at showmeham.info
Wed Apr 24 14:06:46 EDT 2019

reply to both below

The Tom Tom doesn't seem to be all that stable at all, I just went on a
10mi out and back trip and it didn't lock until I was several miles up the
highway, and it couldn't decide if I was on the highway or in the fields
running roughly parallel to it. I'd say the unit is officially dead, there
hasn't been a software update available for it since 2013. I guess it's
time to get a new GPS unit, maybe something that works as a GPS source for
the TT4 and will show received data on the screen as well.

Matthew A. Chambers, NR0Q

Matthew, I only tried firing up the GPS-III once since the epoch rollover.
It did take a long time to get a lock, but that was inside the house (it
never was good at that), and was doing a cold boot with no clue as to where
anything was in the sky.  Did your TomTom continue to have a hard time
getting a lock, after the first time?  How long does it take?  That might
be the fatal aspect to continued use of the older units.

On Wed, Apr 24, 2019 at 12:58 PM MJ Inabnit <ke6sls at arrl.net> wrote:

> On 4/24/19 10:08 AM, Matthew Chambers via aprssig wrote:
> > Here, my (really old) Tom Tom still kinda works but takes an eternity to
> > get a lock, and has a lot of slop now it's location, in that it appears
> > that I'm wondering all over even while sitting still, and it won't keep
> > time, I've had to correct the time on it now the last couple times I've
> > used it.
> That is VERY interesting.  We've noticed that the Kenwood TH74d is also
> doing that just a week ago!  Radio sitting in ham shack south of me and
> dozens of plots around the actual qth!  Was very odd when I zommed into
> his location and seen all the lines!
> 73
> j
> --
> wishing you well
> Jaye, ke6sls--via the toshiba w/thunderchicken
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