[time-nuts] GPSDO Alternatives

Bob Camp lists at rtty.us
Wed Dec 5 00:01:50 UTC 2012


I would guess that HP/Agilent/Symmetricom and Trimble made 100X more GPSDO's than the next five people in the business combined over the 1995 to 2005 period.


On Dec 4, 2012, at 10:26 AM, paul swed <paulswedb at gmail.com> wrote:

> Al
> I like the truetime products. In general easy to understand and last a long
> time.
> But there never seemed to be that many. Sure they were used in broadcasting
> and maybe power. But the others like the 3801 and tbolt were used in telco
> and mobile apps so there were 10,000s turned out and thats why we get them
> for cheap. I simply never see the truetime dc60 or gps units around. Though
> I have my stock of dc468 sat clocks. :-) Working. I hacked a goes sat
> replacement 3-4 years ago.
> That said some of the older gps technology is a bit slippery on exactly how
> good they are.
> So for perhaps amateur purposes they are totally fine but when you start
> comparing to a Tbolt or 3801 various behaviors apear.
> Odetics GPStars as an example slip cycles on purpose. Its a mode you can
> set and by default is how they are set.
> For what they were intended for they are perfect. But at least 1 X10 poorer
> then other devices. Its not at all broken. It was a general time piece for
> radio networks. Give or take 500 ms.
> Regards
> Paul
> On Tue, Dec 4, 2012 at 9:58 AM, Al Wolfe <alw.k9si at gmail.com> wrote:
>>   Most of the choices I've seen here mention the Tbolts, 3801, 3805, etc,
>> but I have never seen anyone mention the TrueTime XL-AK. It advertises 40
>> nsec 1 pps. Frequency as 1 x 10-12 per day. I have one and it seems to work
>> well but have no way to test it against anything else yet. It has four each
>> 10 MHz sine output that I have been using for house sync for HP3586,
>> HP8924c, PTS160, etc.
>>   So how does the TrueTime compare to other GPSDO's?
>> Al, K9SI
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