[time-nuts] RFX GPSDO - Anybody played with one of these?

[SAIDJACK at aol.com]

Hi Paul,
 
yes, it's a promotional tool, we did not put it on the website yet. We did  
put the GPSOCXO/GPSTCXO page on there though, and the GPSTCXO is used on 
that  eval kit. Even though it is "only" a very high-end TCXO, it's 
performance is  quite good, especially when encased in a small plastic bag etc to keep 
airflow  away from it.
 
TVB has done some measurements on this board, and I think he may have a  
page with the results on his website somewhere.
 
Here is the GPSTCXO eval board photo, the user manual is too big to be  
posted to this list, let me know if you want me to send it off-list to  you.
 
The eval board has a 10MHz LVCMOS output on the BNC connector, supports a  
USB connection for power, NMEA, SCPI, and 1PPS interface, and has a solder 
point  for the LVCMOS 1PPS output. It also has a connector for optional 
exernal 4V to  8V power supplies, and comes with an antenna, a USB cable, a CD 
with software an  manuals, and a quick-start instruction sheet.
 
Hope that helps,
Said
 
 
In a message dated 10/2/2012 12:24:29 Pacific Daylight Time,  
paulswedb at gmail.com writes:

Said
I was looking and did not see the eval kit on the  sight???
Thanks
Paul
WB8TSL

On Tue, Oct 2, 2012 at 12:29 PM,  Bob Camp <lists at rtty.us> wrote:

> Hi
>
> The rated  temperature stability of the OCXO is not "super good". You will
> see  more frequency shift on it than say the TBolt OCXO, far more than a
>  DOCXO.
>
> That's not at all saying it's a bad part. For Time Nut  duty, I would try 
to
> keep it in a fairly benign ambient  situation.
>
> Bob
>
> -----Original  Message-----
> From: time-nuts-bounces at febo.com  [mailto:time-nuts-bounces at febo.com] On
> Behalf Of Jim Lux
> Sent:  Tuesday, October 02, 2012 9:04 AM
> To: time-nuts at febo.com
>  Subject: Re: [time-nuts] RFX GPSDO - Anybody played with one of  these?
>
> On 10/2/12 5:08 AM, Azelio Boriani wrote:
> >  Yes, I agree.
> >
> > On Tue, Oct 2, 2012 at 1:29 PM, Bob  Camp <lists at rtty.us> wrote:
> >
> >> Hi
>  >>
> >> The OCXO probably isn't going to do very well with  the outdoor
> temperature
> >> swings.
>  >>
> >> Bob
> >>
>
> Why not..  granted it's easier with large mass and large insulation, but
>  ultimately, it's all about the closed loop gain of the temperature
>  control loop.  With small mass, the time lag effects will be small,  at
> least.
>
>
>
>
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