Reason for GPS problems found!

Yogiz yogizz at
Tue Jul 15 17:30:44 CEST 2008

This is something I really love about this project. if it were closed
source, the problem might not have been found in months. All it takes
is a sufficient community and we've already located the problem.
Hopefully it has easy enough of a fix that we don't have to resend our
Freerunners for repairs and can do the work ourselves. Good job.

On Tue, 15 Jul 2008 12:42:07 +0200
thomasg <thomas at> 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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