Hi,
so it's not only my board ;-) I also have an EM-406, and found this receiver
to be even more problematic: it blinks the red LED (so it gets a fix), but
this fix is sometimes wrong (even though in the NMEA output the receiver
pretends it to be valid). I once had a track that was ok in a diffferential
way (the distances between the points were correct), but the whole track had
an absolute offset of about 30 kilometers south-west... That never happens
with the foxboard switched off. Why are you using a MAX232 here? Mine is
connected directly to the ttyS2 lines.
Best regards,
Cornelius
Am Dienstag, 8. Januar 2008 schrieb umanfredi:
> Hello,
>
> I had the same problem with an EM-406 GPS board with internal
> antenna. I suppose units with external GPS antennae are more robust
> to the interference, but probably this depends also on were the
> antenna is actually placed.
>
> I too experimentally found that taking away the EM-406 board of 50cm
> or more from the FOX is sufficient to get the GPS fixes again. The
> connection in my case is standard flat telephone wire. The GPS board
> is powered from same supply of the FOX and I use a MAX232 signal
> translator colocated with the FOX to translate GPS low output to std
> RS-232 level.
>
> Regards
>
> Ugo
>
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