[time-nuts] Cheap 9.8Mhz Sa.22c's
Bob Camp
lists at rtty.us
Sun Jun 2 18:36:13 EDT 2013
Hi
The GPSDO is the one I mentioned earlier. Here's a completed listing:
http://www.ebay.com/itm/Symmetricom-Nortel-NTBW50AA-12-Ch-GPS-Timing-Module-10MHz-GPSDO-Furuno-GT-8031F-/300909808907?pt=LH_DefaultDomain_0&hash=item460f9f4d0b
They come up from time to time. It's not one of mine. I've bought stuff from the same seller.
Bob
On Jun 2, 2013, at 4:32 PM, Andy Bardagjy <andy at bardagjy.com> wrote:
> 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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