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

[John Ackermann N8UR]

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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