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

Bob Camp lists at rtty.us
Sun Jun 2 16:30:51 EDT 2013


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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