[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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