Reason for GPS problems found!
thomas at gstaedtner.net
Tue Jul 15 13:49:31 CEST 2008
To be correct: not the card, the reader :)
We checked it with some different Sandisk models and the card from OM (also
standard-SD and SDHC), so the card itself cannot be the fault.
On Tue, Jul 15, 2008 at 1:43 PM, Rune Gangstø <runegang at gmail.com> wrote:
> I've got a fix in 41secs (TTFF 41)
> Thanks for the great sharing :D
> The bad thing is the SD card :S
> 2008/7/15 Marcus Bauer <marcus.bauer at gmail.com>:
> > Confirming this too. Under decent conditions first TTFF 130s, then after
> > a power down/power up it was ~40secs. Never saw it that fast on the
> > Neo1973. Excellent! Well, more or less :o)
> > On Tue, 2008-07-15 at 12:42 +0200, thomasg wrote:
> >> Hi ppl,
> >> I write this to community, not to devel or owners because everyone
> >> should know:
> >> sbeh, one of the people in #neo1973-germany IRC-channel found the
> >> reason for the GPS problems.
> >> The problem only occurs if a SD card is set in. Doesn't matter if it's
> >> mounted or in use, it just has to sit in the socket.
> >> The TTFF went from no fix at all to TTFF 120 seconds indoor(!!!), and
> >> about 40 seconds outdoor.
> >> Two other people could verify this with about the same results.
> >> We'll do more tests later, but for now we surely know what's causing
> >> the problem (and it seems to be a EMC problem).
> >> First results show at the same devices, even outdoor, that there is no
> >> fix in over 400 seconds with SD card, the signal seems to be at least
> >> 10 to 20 dB worse (so bad, that most satellites don't even appear).
> >> Testresults from other people appreciated.
> >> thomasg
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