[time-nuts] Recommendations for a newbie?

EWKehren at aol.com EWKehren at aol.com
Sat Sep 8 17:12:52 UTC 2012


For a GPS receiver that is in my book acceptable but then I am not a  
time-nut. I use that signal to discipline Rb's. Works for me.
Bert Kehren
 
 
In a message dated 9/8/2012 12:47:52 P.M. Eastern Daylight Time,  
lists at rtty.us writes:

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
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