2008/6/27 Marcus Bauer <[EMAIL PROTECTED]>: [...] cut a lot! >> Our tests on GPS TTFF where quite comparable with some of the best devices >> available. However note there is some data GPS *has* to download from sat >> for "virgin" fix, which may take as long as 12min due to low bandwidth the >> sats offer (just takes this time for them to send one complete set of ephem >> and alm), > > Under good conditions all modern GPS chips have a cold start TTFF > ("virgin fix") of ~45secs. 12min is the value for 8 to 10 year old > chips. > >> On tests done at Taipei the TTFF was around ~40sec without(!) >> AGPS, IIRC. > > All reports on the MLs spoke about minutes or not getting a fix at all. > >> So this is a clear sw-issue. > > What could be the problem then? Usually you power the GPS up and you > listen on /dev/ttySAC1 for the NMEA sentences. That's how it works on > the Neo1973 and every other device. What software tweaking can be made?
So far i have tested 6 OpenMokos in Germany. With the internal antenna i never got a fix in less than 1min 20 secs if ever (2 hours) (Perfect conditions/ sirf3 need 36 sec cold boot). Even when i use AGPS. As soon as i attach a external antenna it easily finds a lot more satellites and connects withing 40 to 50 seconds. So i think its neither a software issue nor a satellite visibility problem but a problem with the internal antenna or the wiring to this internal antenna. Can someone test this too and affirm my results? _______________________________________________ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community