[time-nuts] solved: KS-24361 "NO GPS" - again

[Bob Camp]

Hi

The computer programs are all looking at the serial output of the GPS module in 
the box. When it says 3 sat’s that is all it can see. There are three basic reasons why
this can be:

1) It still does not have an almanac / ephemeris from the GPS system and is
downloading it. Without that data these modules can’t grab a full set of sats. They
do not have the processing horsepower of more modern modules.

2) It *has* the data, but it’s got the wrong one. It’s confused and may or may
not straighten it’s self out.  We’ve gone back and forth on this one. There is 
info in the archives. 

3) You simply can not see enough sat’s from you antenna location. Even with less
than perfect antenna locations I can get > 8 sats (on an 8 channel receiver) at all
times. 

The worst case is a combination of all of the above. If you have only one or two
sats in view at some times, it will take a *long* time to get the almanac and to figure
out an error. It also will take a very long time to complete a survey. 

One and two are somewhat Motorola specific. The third one applies to just about 
any module trying to do this stuff. The first two are just startup issues. The third is 
with you forever. When you start dropping below 4 sats the timing (and thus stability
of the box) degrades. With multi path involved there is no simple way to know just
how bad things will get in a 1 or 2 sat situation. 

Bob

> On May 29, 2015, at 2:46 AM, Mod Mix <modmix at t-online.de> wrote:
> 
> It's simply a matter of time - this morning, all satellites are back again and clock is locked.
> Didn't know this may take sooooo much time...
> Thanks to all responding!
> Ulli
> 
>> Wall, again some hours later at least the LED show the normal picture.
>> Though, Ulrich's program is still showing no more than two satellites.
>> Do I have to be more patient?
>> Ulli
>> 
>> Am 20.05.2015 um 20:59 schrieb Mod Mix:
>>> Hi,
>>> my KS-24361 REF 1 / REF 0 combo was running nicely for many weeks.
>>> To check a newly received REF 0 it was connected instead of the nicely runnning one.
>>> Did almost fine - except: NO GPS stayed solid on for about an hour.
>>> At leat, i saw 1 or 2 satellites from time to time.
>>> When I put back the original one, it behaves the same: solid NO GPS for hours .-(
>>> Does not see any satellite at all...
>>> Interconnect cable was changed...
>>> GPS antenna was changed...
>>> No success...
>>> Any idea how to make it tracking GPS again?
>>> Thank you in advance,
>>> Ulli
>>> 
>>> _______________________________________________
>>> time-nuts mailing list -- time-nuts at febo.com
>>> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>>> and follow the instructions there.
>> 
>> _______________________________________________
>> time-nuts mailing list -- time-nuts at febo.com
>> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>> and follow the instructions there.
> 
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.