[time-nuts] RFTGm-II-Rb - can you gps discipline it without the XO module?

Guido Küppers guikueppers at t-online.de
Sat Aug 17 08:37:29 EDT 2013


Hi Alan,
the one I used was a Oncore UT. The message needed for the RFTG is @@Ea...... once a second if I remember correctly. Note that the RFTG doesn't talk to the UT, it just listens, so you will need to initiate the messages somehow. 
There's also some windows diagnostic software for the RFTG on ko4bb's archive.
Have fun
Guido


Von Samsung Mobile gesendet

Alan Kamrowski II <alank2 at earthlink.net> hat geschrieben:

Hi Guido,

>Been there, done that.
>The RFTGm-RB can be disciplined if you connect the pps and the gps 
>data stream coming from a motorola Oncore. Regards Guido

I've pulled it apart and the board does show a connection to the EXT C-FIELD.  That trace runs to a jumper labeled A C B and currently C B is shunted.

Any particular Motorola oncore model required - I see a bunch of them on Ebay...

Thanks,

Alan

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On Behalf Of Guido Küppers
Sent: Friday, August 16, 2013 3:29 AM
To: Rex; Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] RFTGm-II-Rb - can you gps discipline it without the XO module?



Von Samsung Mobile gesendet

Rex <rexa at sonic.net> hat geschrieben:

I don't think the rubidium module for these systems can be disciplined. 
I think they were only intended as a backup if the XO section or GPS failed. The XO section does discipline but I don't know the details.

I'm not sure of the model number, Lucent had several variations on the same theme in that time frame. I had one of the rubidiums that may be the same as yours. Trying to trace out some of the circuits, I found that the EFC on the LPRO connector was not being used at all.


On 8/15/2013 7:52 AM, Alan Kamrowski II wrote:
> Hi Everyone,
>
>   
>
> I've only got the RFTGm-II-Rb module.  I found an interface cable 
> specification here:
>
>   
>
> http://www.ko4bb.com/Manuals/05%29_GPS_Timing/RFTG-m/RFTGm%20Interface
> %20Cab
> le.pdf
>
>   
>
> Does anyone know if feeding a 1pps signal to pin 9 might discipline 
> it?  Or does it need the other connections such as GPS data, etc.
>
>   
>
> Is there a ground on this connector?
>
>   
>
> Thanks!
>
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