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

Bill Dailey docdailey at gmail.com
Tue Oct 2 19:07:59 EDT 2012


I went with something modern that haut works (fury). But bitten by time buttery and now trying to discipline a very good OCXO with a fury board.  Quite challenging actually.  Having to balance  noise etc.

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On Oct 2, 2012, at 4:20 PM, paul swed <paulswedb at gmail.com> wrote:

> 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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