[time-nuts] Lucent KS-24361, HP/Symmetricom Z3809A, Z3810A, Z3811A, Z381...

Bob Camp kb8tq at n1k.org
Tue Nov 4 07:45:47 EST 2014


Hi

All of these GPSDO boxes have enough spurs to bother something like a direct multiply microwave radio. Most of them are plenty clean enough to drive a counter standard input. 

Bob 
> On Nov 4, 2014, at 6:23 AM, GandalfG8--- via time-nuts <time-nuts at febo.com> wrote:
> 
> Hi Bob,
> 
> Thanks for that, I wasn't expecting too much from the 10MHz, thinking of it 
> as probably a quick and dirty reference for portable test gear, but maybe 
> wasn't  expecting it to be quite that bad either:-)
> 
> 15MHz I would have expected to be reasonable, and my goal is still to  
> extract 5 MHz directly from the oscillator, buffered as necessary  but with as 
> little degradation as possible, but for now I've had to content  myself with 
> live monitoring of the plots on a couple of Pendulum counters, what  with 
> all being as chaotic as usual round here and far too much test gear  stacked 
> up in piles and nowhere near the bench:-)
> 
> You've whetted my appetite though so will try and stretch some cables later 
> and take a closer look at the outputs.
> 
> Regards
> 
> Nigel
> GM8PZR
> 
> 
> 
> In a message dated 03/11/2014 23:55:52 GMT Standard Time, kb8tq at n1k.org  
> writes:
> 
> Hi
> 
> I got a chance to look at phase noise today. I’ll try to  post the plots 
> later. Quick summary:
> 
> 10 MHz - ugly. Lots of spurs, many  of them close in. Poor phase noise 
> floor. 
> 
> 15 MHz - pretty good. Noise  floor is not as good as a TBolt (by 5 to 15 
> db). Far fewer spurs than the 10  MHz, fewer spurs than the TBolts I’ve looked 
> at.   
> 
> ADEV on a  short run looks better than an un-tuned TBolt. I’ll need a much 
> longer run to  see what it’s really doing.
> 
> Bob
> 
>> On Nov 3, 2014, at 1:20 PM,  GandalfG8--- via time-nuts 
> <time-nuts at febo.com> wrote:
>> 
>> Ah, that's interesting, perhaps it wasn't me after all then.
>> 
>> Did you have the same flashing ON light symptoms?
>> 
>> Regards
>> 
>> Nigel
>> GM8PZR
>> 
>> 
>> In a  message dated 03/11/2014 17:56:56 GMT Standard Time,  
>> hmurray at megapathdsl.net writes:
>> 
>> 
>>> It turns out  this is what happens if you switch the "Output Level" from 
> 
>> 17
>>> to 23, obviously an advisory indication to draw attention to  the  higher
>>> output. Switching it back reduces the level, as  expected, and  returns 
> the
>>> LED function to normal.  Phew:-)
>> 
>>> I  can't remember switching it but  don't suppose it arrived like that 
> so
>>> guess I must have done.  
>> 
>> My pair came with Ref-0 set at 17 and Ref-1 at   23.
>> 
>> 
>> -- 
>> These are my opinions.  I  hate  spam.
>> 
>> 
>> 
>> 
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