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Jammer
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Joined: Aug 09, 2004
Posts: 100
Location: London
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 Posted: Thu Aug 19, 2004 11:52 am Post subject: No GPS signal! :( |
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I'm using a TTN3 Bluetooth with an iPaq 1940.
The system will seem to be working fine.
If I turn the Bluetooth unit off and turn on again (just for testing purposes) (or say I turn the thing on in the morning say):
It finds it impossible to find a GPS signal - when previously, 30 seconds previously, the signal was fine with 4/5 satelites showing.
I've tried playing around and poking around and pressing everything... nothing will happen. I've tried rebooting the iPaq. Turning the TTN off and on... and nothing.
Then... suddenly after 20 or so minutes... the signal will automatically come back!
What's happening!? What am I doing wrong?
Any help would be appreciated.
Thanks.
Jam
AND...
I don't know if anyone would agree... but the Tomtom manual (that I've had to print off) sucks. It's totally unintuitive and hard to follow!
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iPaq 3870
Fortuna Clip On Bluetooth
Tomtom
London
Currently testing Fortuna to see if it's any good! |
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lbendlin
Pocket GPS Staff
Joined: 02/11/2002 22:41:59
Posts: 11878
Location: Massachusetts, USA
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| Posted: Thu Aug 19, 2004 9:07 pm Post subject: |
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can you confirm that you are using the receiver at NMEA 38400 ?
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Lutz
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Hunnymonster
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Joined: Apr 11, 2004
Posts: 140
Location: Mid-Northumberland, UK
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| Posted: Thu Aug 19, 2004 9:48 pm Post subject: Re: No GPS signal! :( |
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| Jammer wrote: | | It finds it impossible to find a GPS signal - when previously, 30 seconds previously, the signal was fine with 4/5 satelites showing. |
That sounds like it's losing the ephemeris data when it's switched off - and I'd guess that's usually caused by a faulty battery/capacitor for maintaining the ephemeris in NVRAM.
| Jammer wrote: | Then... suddenly after 20 or so minutes... the signal will automatically come back!
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It takes something like 12 minutes for the ephemeris data to download, assuming that the unit maintains clear sight of the satellite it's acquiring the ephemeris from - so if you're moving or the satellite you're acquiring from moves out of view (behind a building, below the horizon etc) then it'll have to start the ephemeris download all over again.....
Bottom line, I don't think your unit should do that either - kind of suggests it might be faulty (the batteries are shot), or not yet fully charged - not having ever played with the TomTom unit I couldn't say for sure though. |
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Jammer
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Joined: Aug 09, 2004
Posts: 100
Location: London
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| Posted: Thu Aug 19, 2004 10:17 pm Post subject: |
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| lbendlin wrote: | | can you confirm that you are using the receiver at NMEA 38400 ? |
what's that 
i rang up tomtom. and they said they'd supply a new one.
they're even arranging it to be taken (and have delivered afterwards) by courier.
thanks for all the replies.
_________________
iPaq 3870
Fortuna Clip On Bluetooth
Tomtom
London
Currently testing Fortuna to see if it's any good! |
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lbendlin
Pocket GPS Staff
Joined: 02/11/2002 22:41:59
Posts: 11878
Location: Massachusetts, USA
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| Posted: Thu Aug 19, 2004 11:31 pm Post subject: |
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| Jammer wrote: | | lbendlin wrote: | | can you confirm that you are using the receiver at NMEA 38400 ? |
what's that
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Your GPS receiver supports different protocols, SiRF and NMEA. Sometimes the SiRF protocol gives problems, and aas a precaution you should run your receiver with the standard settings. For serial receivers the standard happens to be the NMEA protocol at a speed of 4800 Baud. For BlueTooth receivers (like yours) it happens to be NMEA at 38400 baud.
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Lutz
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Jammer
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Posts: 100
Location: London
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| Posted: Thu Aug 19, 2004 11:42 pm Post subject: |
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so how do i check/change?
_________________
iPaq 3870
Fortuna Clip On Bluetooth
Tomtom
London
Currently testing Fortuna to see if it's any good! |
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lbendlin
Pocket GPS Staff
Joined: 02/11/2002 22:41:59
Posts: 11878
Location: Massachusetts, USA
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| Posted: Thu Aug 19, 2004 11:46 pm Post subject: |
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It's very easy actually. Go to Start > Settings > System > GPS, and tap on the GPS tab. uncheck the box and then examine the dropdowns.
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Lutz
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