Re: [time-nuts] Beginner's Atomic Clock

2019-09-17 Thread Bob kb8tq
Hi You probably are not going to find the Nano’s on the used market. The last one I worked with was very much a pre-production unit and that was only a few years back. Indeed if you are simply looking for a lab clock, the miniature Rb’s may not be the best choice. Their stability is generally

Re: [time-nuts] Beginner's Atomic Clock

2019-09-17 Thread Richard (Rick) Karlquist
On 9/17/2019 12:33 AM, Dr. David Kirkby wrote: Is there any advantage in using a GPS Rb disciplined oscillator vs a GPS disciplined high quality OCXO like the HP 10811A? I can’t understand why there should be, as a Rb source would use an OCCO in its output stage Therefore in each case *

Re: [time-nuts] Beginner's Atomic Clock

2019-09-17 Thread Dana Whitlow
Dr. Kirby, et al, Remember that a GPS-disciplined Rb has two loops, hence two time constants, to consider: a) the loop which locks the Rb's internal OCXO to the atomic transition, and b) the GPS disciplining loop. I surmise that the internal loop (a) is fast enough to thoroughly suppress drifts

Re: [time-nuts] Beginner's Atomic Clock

2019-09-17 Thread John Ackermann N8UR
On 9/17/19 3:33 AM, Dr. David Kirkby wrote: > On Tue, 17 Sep 2019 at 04:00, Dana Whitlow wrote: > >> The nice thing about a Rb is that its short term stability (seconds to >> minutes and perhaps >> even longer) is much better than that of a GPS timing receiver. The bad >> news is that Rb >>

Re: [time-nuts] Beginner's Atomic Clock

2019-09-17 Thread pisymbol .
On Mon, Sep 16, 2019 at 11:00 PM Dana Whitlow wrote: > All of the available Rb standards that I've seen have a 10 MHz output, > Some have a > 1 PPS output as well. > original buyer could save a few bucks. My PRS-10 is one of these. > > How does this compare with say a used Accubeat AR133/60

Re: [time-nuts] Beginner's Atomic Clock

2019-09-17 Thread Dr. David Kirkby
On Tue, 17 Sep 2019 at 04:00, Dana Whitlow wrote: > The nice thing about a Rb is that its short term stability (seconds to > minutes and perhaps > even longer) is much better than that of a GPS timing receiver. The bad > news is that Rb > standards exhibit long term frequency drift in the

Re: [time-nuts] Beginner's Atomic Clock

2019-09-16 Thread pisymbol .
First off, thanks to everyone who replied. On Mon, Sep 16, 2019 at 11:00 AM Bob kb8tq wrote: > What are you really trying to do here? > Take over the world - one epoch at a time. If it’s a “from scratch” atomic standard, then you just aren’t going to get > there. Sorry about that ... > Ok.

Re: [time-nuts] Beginner's Atomic Clock

2019-09-16 Thread Bob kb8tq
Hi What are you really trying to do here? If it’s a “from scratch” atomic standard, then you just aren’t going to get there. Sorry about that ... If it’s a wall clock sync’d to an external radio service then indeed you might get there. In-between those two lie tings like buying eBay telecom

Re: [time-nuts] Beginner's Atomic Clock

2019-09-16 Thread David J Taylor via time-nuts
From: pisymbol . Can anyone suggest a "starter" atomic clock project? By beginner's something that is fairly easy to put together and isn't cost prohibited (maybe a few hundred but not thousand). Thanks! -aps (Alex) = Alex, Perhaps you could clarify what

Re: [time-nuts] Beginner's Atomic Clock

2019-09-16 Thread jimlux
On 9/16/19 4:16 AM, pisymbol . wrote: Can anyone suggest a "starter" atomic clock project? By beginner's something that is fairly easy to put together and isn't cost prohibited (maybe a few hundred but not thousand). Do you mean "build the physics package", or are you just talking about

[time-nuts] Beginner's Atomic Clock

2019-09-16 Thread pisymbol .
Can anyone suggest a "starter" atomic clock project? By beginner's something that is fairly easy to put together and isn't cost prohibited (maybe a few hundred but not thousand). Thanks! -aps (Alex) ___ time-nuts mailing list --