[time-nuts] Second Units? KS-24361

Bob Camp kb8tq at n1k.org
Wed Nov 12 07:41:24 EST 2014


Hi

If you look at the TDev plots or a phase plot on these units, they look a lot like a Z3801. They wander 10’s or ns as they do their “thing”. While GPS out of these receivers is good to (at most) 1 ns. That’s the resolution of the sawtooth (if they are using it). That only counts if you are looking at the 1 second to 1 second RMS deltas. The “fall off by tau” rule holds for a few decades past 1 second, but it does eventually fall apart. The GPSDO will follow GPS past a point.

Bob
 
> On Nov 11, 2014, at 8:55 PM, paul swed <paulswedb at gmail.com> wrote:
> 
> Bob
> I will say that I am watching the noise of the pps ti in the z3811 program.
> Granted its been running 30 some hours now. Virtually nothing in time. My
> fingers are crossed it will clean up.
> I do like the unit quite well. Have to thank Bert for even cluing me in.
> So I do agree quite a nice unit.
> Regards
> Paul
> WB8TSL
> 
> On Tue, Nov 11, 2014 at 7:42 PM, Bob Camp <kb8tq at n1k.org> wrote:
> 
>> Hi
>> 
>> Here’s another way to look at the second unit - What would you pay (on an
>> auction site) for the parts? Since there’s a warranty on the box, all would
>> be 100% good working parts with a solid guarantee and paid shipping back:
>> 
>> Lucent low EMI DC-DC converter “power brick” - $35 + $5 ship
>> MTI 260 OCXO                                                   $35 + $15
>> ship
>> Nice board built up with GPSDO parts                  $  (gotta be at
>> least 20) + ship
>> Metal enclosure                                                         $
>> (ok, it’s not that good, $5)
>> Connectors, buffering, filtering                               $ something
>> 
>> Just the two big parts in the box likely would set you back more than the
>> cost of the second unit delivered in the US. If you are headed into a GPSDO
>> project, the thing is a steal.
>> 
>> Bob
>> 
>> 
>> 
>> 
>> 
>>> On Nov 10, 2014, at 1:41 AM, F. W. Bray <fwbray at mminternet.com> wrote:
>>> 
>>> 
>>> Sorry, I intended to say that this question concerns the KS-24361 units.
>> Forgot to put that in the subject line!
>>> 
>>>> I have one complete setup on the way. Any thoughts as to whether it is
>> better to get a second complete set or just go for the unit that has the
>> GPS in it? This would be as a spare or possibly actual use.
>>>> 
>>>> Thanks.
>>>> 
>>>> Fred
>>>> 
>>>> KE6CD
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