[time-nuts] GPS-18x behaving weirdly

paul swed paulswedb at gmail.com
Thu Mar 27 20:54:29 EDT 2014

Not sure that I can help much.
I have been following the thread and have numbers of units of this vintage
and have used a few in projects. Those projects seemed to have funnies
after a while.
I am starting to have a bad feeling that if I look carefully I will find
some of this perhaps going on.

However if I go back into those projects at all I suspect I will shove a
ublox in and be done. One was the TrueTime GOES DC468 sat simulator.
Thanks for an idea.

On Thu, Mar 27, 2014 at 6:56 PM, Jim Lux <jimlux at earthlink.net> wrote:

> On 3/27/14 8:53 AM, David J Taylor wrote:
>> From: Jim Lux
>> []
>> Has anyone seen a similar behavior?  I've tried the power cycling, and
>> the Garmin "reset" command.  I've not done the "clear non-volatile
>> memory" which makes it forget the almanac.
>> ===============================================
>> What firmware are those units running?  Is it the latest?  3.90?  Maybe
>> blowing the firmware would reset the position?
> yes, running 3.90.. they're only a year old, and 3.90 came out earlier
> than that I think..
> In any case, I set one of them to the present lat lon, within a few
> seconds of arc, and it seems to have acquired, changed the fix a bit, and
> then stopped again.
> The other one is resolutely stuck.  I'm thinking there's got to be some
> simple option that I'm overlooking.  It's kind of frustrating, because
> there's no NMEA sentence that tells you what the acquisition/search status
> is: just which ones it is trying to track and what the status is (unlocked,
> no data for all of them).
>  Otherwise, I do have a simple program for monitoring the serial port:
>>   http://www.satsignal.eu/software/net.htm#SerialPortLEDs
> I'll try that..
>> Cheers,
>> David
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