[time-nuts] Re: Please help. Motorola Oncore

[Marcelo Dantas]

Hi John,

I suspect it could be something like this, because when I bought it new
(with this same antenna) the GPS would lock very quickly and have maybe 5
to 7 satellites tracked real quick.
Now after being on the shelf for a couple years, this happens.
I will try to research this calibration process, maybe I will get lucky.

Thanks,
Marcelo.


On Mon, Sep 19, 2022 at 3:34 PM John Ackermann N8UR via time-nuts <
time-nuts at lists.febo.com> wrote:

> Some of the early Motorola receivers had an issue with long-term XO
> drift.  That can result in failure to lock if the unit has been powered
> off for a long time.  There is a procedure to recalibrate it (no test
> equipment required).  I think it was written up in a Motorola app note
> that's available on line, but I can't put my finger on it right now.
>
> John
> -----
>
> On 9/19/22 07:53, Gregory Beat via time-nuts wrote:
> > IF you start with Fixed Position mode, THEN this speeds up process.
> > I would also suggest a CLEAR View of Sky for the Antenna.
> >
> > Motorola Oncore UT Plus Engineering Notes (circa 2000)
> > https://synergy-gps.com/wp-content/uploads/2018/11/ut-engg-notes.pdf
> >
> > Motorola Oncore GT Plus Engineering Notes (circa 2000)
> > https://www.tapr.org/pdf/GT_Eng_Notes.pdf
> >
> > UT Plus model numbers:
> > R5122U111x - right angle OSX
> > R5222U111x - right angle OSX, on-board Lithium battery
> > R5122U115x - straight OSX
> >
> > GT Plus model numbers:
> > R3111G111x - standard version
> > R3211G111x - on-board Lithium battery
> > R3111G114x - SMB antenna connector
> >
> > greg, w9gb
> > ==
> > Date: Sun, 18 Sep 2022 08:42:18 -0400
> > From: Marcelo Dantas <marcelo.f.dantas at gmail.com>
> > Subject: [time-nuts] Thanks for adding me, and please help. Motorola
> Oncore
> > To: time-nuts at lists.febo.com
> >
> > Hi there Everyone,
> >
> > Thanks for accepting me to this list.
> > I am in (dire) need of help here and maybe one of you is a Motorola
> Oncore
> > user and could assist.
> >
> > I have a couple Motorola Oncore modules, which I use mounted to a
> > "baseboard" for timing purposes.
> > One is a R5222U1115 and the other a R3111G1112.
> > They have been sitting in a drawer for some time. Being "some time" since
> > the pre-pandemic era.
> > Now I am trying to use them again but for whatever reason they won't lock
> > to any satellites.
> > The modules are starting up, sending 1pps and seem to be accepting
> commands
> > correctly.
> > I have also tested the baseboard (power, serial, etc) and the antenna.
> > The antenna works well on a third (non-motorola) module.
> > I have tried everything, left the modules there running for 24 hours.
> > No joy. None of them will lock to any satellites.
> > I have tried defaulting them using WinOncore, no change.
> > I have also tried to find an almanac file to upload, hoping it would
> help,
> > but couldn't find one with the required .alm file extension.
> > At this point I do not know what to do anymore. I have a system (module,
> > board, antenna, power, etc.) that should just work, and yet it refuses
> to.
> > Maybe there's some special factory reset? Maybe there's some command I do
> > not know about? Maybe other software than WinOncore with some extra
> > debug options?
> >
> > Any guidance here would be deeply appreciated.
> >
> > Thanks a lot in advance,
> > Marcelo.
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