[time-nuts] Cheap 9.8Mhz Sa.22c's

[Andy Bardagjy]

Bob, are you referring to a particular GPSDO (for $120)? Which is it? Can
you provide a link?

Andy Bardagjy
bardagjy.com


On Sun, Jun 2, 2013 at 4:30 PM, Bob Camp <lists at rtty.us> wrote:

> Hi
>
> Far cheaper to spend the $120 on the GPSDO that does the 9.8304 to 10 MHz
> conversion than to send the Rb back to the factory.
>
> Bob
>
> On Jun 2, 2013, at 4:24 PM, Ed Palmer <ed_palmer at sasktel.net> wrote:
>
> > Glutton for punishment, aren't you Mark!  :)
> >
> > There's probably no way to get to 10 MHz.  I have two of these that I
> picked up just to play with.  Another purchaser contacted Symmetricom and
> actually got some information out of them.  The oscillator in these runs at
> 58.9824 MHz.  The default output is 9.8304 MHz.  The output can be changed,
> but only in submultiples of the 58.98 MHz.  e.g. 58.98 divided by 6 equals
> 9.8304.  You can change  the '6' to various integers as documented in the
> manual.
> >
> > To move the output to 10 MHz you'd have to change the crystal back to
> the standard 60 MHz so that you could divide it by 6.  But then you'd mess
> up the multiplier that takes the crystal frequency up to the Rb frequency.
>  You'd have to change the synthesizer that controls that side of the
> system.  There's no way to tell if that would require a completely new
> firmware load or if, just maybe, there could be an undocumented (maybe
> protected) command to modify it.  You might be able to send it back to
> Symmetricom to get it changed but, based on my experience, you couldn't
> afford it.
> >
> > Ed
> >
> > On 6/2/2013 11:52 AM, Mark C. Stephens wrote:
> >> These are 9.8304Mhz, is possible to move them to 10Mhz?
> >>
> >>
> http://www.ebay.com/itm/Symmetricom-SA-22c-9-8304MHz-Precision-Rubidium-Oscillator-5V-and-15V-NICE-/261223397404
> >>
> >>
> >> -marki
> >>
> >>
> >> Kind Regards,
> >> Mark Stephens
> >>
> >> Mark Clemens Stephens | Customer service engineer | Non-Stop Computer
> Ltd
> >> * +61 2 9011 8186 | ( +61 428 256 334 | * marks at non-stop.com.au<mailto:
> marks at non-stop.com.au>
> >>
> >> Non-Stop Computer PTY LTD
> >> 79 Devon St
> >> North Epping
> >> NSW 2121
> >> Australia
> >> Timezone: AEST (UTC +10)
> >>
> >> Email: service at non-stop.com.au<mailto:service at non-stop.com.au>
> >
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