[time-nuts] Recommendations for a newbie?

[Bob Camp]

Hi

If you stretch out to > 10,000 samples and watch over a full 24 hour period, you likely will see some in the +/-1.5 ns region.

Bob

On Sep 8, 2012, at 11:06 AM, EWKehren at aol.com wrote:

> Not being a time nut but a frequency nut I lack some of the time test  
> equipment, but my partner on our joint development work makes up for it. So he  
> among other things recently looked at the 1 pps output of the Tbolt against 
> a  Cesium. Using a HP 5352A with 500 samples over 50% are within +- 300 psec 
> and  all within +-1 nsec. It makes an excellent GPS receiver and the 10 MHz 
> out make  a good reference for counters, spectrum analyser and Signal 
> Generators.  Good place to start, specially because of all the software 
> available. Any  significant improvement on it should be well thought out and lower 
> A/V   products are hard to find and seldom cheap.
> Bert Kehren
> 
> 
> On Fri, Sep 7, 2012 at 11:34 AM, Robert Liesenfeld  <xunil at xunil.net> wrote:
>> Hello-
>> 
>> My name is Robert  Liesenfeld, I discovered this mailing list via the
>> fascinating website  leapsecond.com.  I'm an amateur radio operator (AK6L)
>> and builder,  and my interest in precise timekeeping initially stemmed 
> from
>> simply  wanting a very accurate clock source to which I could reference my
>> test  equipment (counter, spectrum analyzer, etc), but has expanded to a
>> desire to perform timekeeping experiments.  I have several questions;  I
>> looked for a FAQ but couldn't find one, so I hope it's alright to ask  
> here.
>> 
>> I'm considering the purchase of a GPS receiver to serve as  my workbench
>> 10MHz source.  Since learning about precise  timekeeping, I've also become
>> interested in some experiments, such as  measuring the stability of the
>> mains, the effect of the ionosphere on  WWV/WWVH signals, and so on.  So 
> far
>> I've looked at various HP  "Z-boxes" (Z3816, Z3815, Z3801, Z3805) and the
>> Trimble Thunderbolt  receiver.  All of these seem to be in the $200-$500
>> range I'm  targeting, but it's not clear what the differences are.  I've
>> read  the Thunderbolt is an older design with fewer channels, but I don't
>> know  if that's really a problem for my intended use.
>> 
>> I've also seen  many rubidium devices on eBay, most seem to have been
>> removed from CDMA  cell tower service.  Does anyone here have any 
> experience
>> with such  devices, are the ex-cell-tower units any good?  I have read 
> that
>> a  rubidium standard's short-term stability is not as good as a GPSDO, and
>> that they're mainly used for holdover - is my understanding correct?   My
>> thought is to (eventually) use a rubidium device to stabilize a  GPSDO
>> should the receiver lose satellite signal.
>> 
>> Thank  you in advance for any advice!
>> 
>> -Robert
>> _______________________________________________
>> time-nuts mailing list  -- time-nuts at febo.com
>> To unsubscribe, go to  
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>> and follow the  instructions  there.
> 
> _______________________________________________
> time-nuts  mailing list -- time-nuts at febo.com
> To unsubscribe, go to  
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the  instructions there.
> 
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.