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

paul swed paulswedb at gmail.com
Tue Oct 2 17:20:48 EDT 2012


Said
I have to say I was looking through the list of modules that are available.
I guess a couple of things really jump out.
The low power consumption and what you get in terms of behaviors. It is
pretty amazing actually. Though I have my power sucking Tbolt and 3801.
But I could easily see for a Amateur radio operator just getting into time
nuttery that these might be a nice way to go. I guess that would open an
interesting debate. Getting the used RBs at Hamfest of questionable quality
for $200 or far less. Or something modern and simply works.
Regards
Paul.

On Tue, Oct 2, 2012 at 3:34 PM, <SAIDJACK at aol.com> wrote:

> 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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