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aero Regular Visitor
Joined: 12/03/2003 01:20:45 Posts: 121 Location: United Kingdom
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Posted: Sun Sep 14, 2003 8:04 am Post subject: Crux View Question |
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I've just received my Emtac BTGPS, it seems to be pretty good so far. I haven't got my TTN2 software yet (although TomTom have emailed me to say it's on the way)
My worry was that I wouldn't get a reliable fix in the car due to heat absorbing windscreens, but so far I've had no problems (even with the Emtac in a cubby hole on the dash!)
My question is, with respect to Crux View Test Program, does View SV refer to the number of satellites visible? The manual says it's the "no. of the satellite visible" - implying only one visible at a time?
And, if you don't mind me asking, what info does the 12-Channel Signal-Level View give me?
Thanks in anticipation! |
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MikeB Frequent Visitor
Joined: 20/08/2002 11:51:57 Posts: 3859 Location: Essex, UK
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Posted: Sun Sep 14, 2003 8:04 am Post subject: Crux View Question |
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Basically the Emtac can receive data on 12 channels at the same time. This is what is shown in the SV display. Each of the 12 bars shows signal strength for the Satellite being tracked and the satellite number.
If you have WAAS switched on then you will only be able to receive positioning data on 11 channels with the 12th being used for position correction data. _________________ Mike Barrett |
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alienrider Occasional Visitor
Joined: 04/04/2003 14:59:59 Posts: 41 Location: United Kingdom
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Posted: Sun Sep 14, 2003 8:04 am Post subject: Crux View Question |
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Hi,
I also have a question about the crux view screen. I have seen green levels which I think means useful data is being retrieved from the satellite and blue levels which seems to mean though a signal is received it isn't useful. But what determines when a signal is useful ? (What determines when a Blue signal becomes a Green signal ?) As some of these Blue readings seem to be quite strong but can't be used to get a fix ?
Thanks in advance for any answers,
B |
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aero Regular Visitor
Joined: 12/03/2003 01:20:45 Posts: 121 Location: United Kingdom
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Posted: Sun Sep 14, 2003 8:04 am Post subject: Crux View Question |
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Sorry to be dull, but which one tells me how many satellites I've got a fix on?
Ta. |
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MikeB Frequent Visitor
Joined: 20/08/2002 11:51:57 Posts: 3859 Location: Essex, UK
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Posted: Sun Sep 14, 2003 8:04 am Post subject: Crux View Question |
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No problem aero, just count the green bars and that tells you haw many satellites are fixed.
AlienRider. There are a number of reasons why you can have a strong signal but the satellite is not used for fixing. Typically it is because the satellite technical information has not been fully downloaded correctly yet.
It is not uncommon to have a fix on 6 satellites with 2 or 3 unfixed. _________________ Mike Barrett |
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aero Regular Visitor
Joined: 12/03/2003 01:20:45 Posts: 121 Location: United Kingdom
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Posted: Sun Sep 14, 2003 8:04 am Post subject: Crux View Question |
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Thanks Mike. |
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flippodc Occasional Visitor
Joined: 09/04/2003 18:39:34 Posts: 4 Location: Belgium
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Posted: Sun Sep 14, 2003 8:04 am Post subject: Crux View Question |
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The receiver will only take as much signals as are needed for a decent fix. Anything more than a decent fix would only require more calculating, and the position will not be better because of the margin of error of the GPS system. However, the receiver will acknowledge that if needed, it is indeed tracking the other satellites.
Minimal number is 2 (on the ground). |
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