Hello Magnus, hello Ulrich - thank you very much for your replies and your suggestions! I will dig deeper into that issue (I begin to get fascinated about precise timing - what a change for someone who once built amplifiers for measuring signals with periods down to 1/100 Hz :-) ). It will take some time (some weeks, since I am preparing for a conference etc.) until I will find time again to improve my oscillator, but I will let you know when I have decided on a circuit design and ask you for advice before actually building it. All the best - have a great day - Bernd. :-)
>Message: 3 >Date: Mon, 12 Jul 2010 14:18:35 +0200 >From: Magnus Danielson <[email protected]> >Subject: Re: [time-nuts] Rubidium oscillator controlled clock >To: [email protected] >Message-ID: <[email protected]> >Content-Type: text/plain; charset=ISO-8859-1; format=flowed > >Bernd, > >On 07/12/2010 02:05 PM, [email protected] wrote: >> Hello Ulrich - >> thank you very much for kind reply - this is a great suggestion. Would you >> recommend simple 74xx74 flipflops driven by the original 10 MHz signal >> delivered by the rubidium oscillator for resynching? > >That should do the trick. Even if I doubt the gain would be significant, >you can use both the DFFs in there in series. It is the common way to >reduce the effect of unsynchronized signal into DFFs as there may be >meta-stability, so using two DFFs in series helps reducing the added >noise if the first DFF goes meta-stable. The '74 should be protected to >some degree if I recall things correctly, but it's there and free... so >why not? > >Cheers, >Magnus > >------------------------------ > >Message: 4 >Date: Mon, 12 Jul 2010 14:47:29 +0200 >From: "Ulrich Bangert" <[email protected]> >Subject: Re: [time-nuts] Rubidium oscillator controlled clock >To: "'Discussion of precise time and frequency measurement'" > <[email protected]> >Message-ID: <87aa1e4d813c493a9f325307ac987...@athlon> >Content-Type: text/plain; charset="us-ascii" > >Bernd, > >> Would you recommend simple 74xx74 flipflops >> driven by the original 10 MHz signal delivered by the >> rubidium oscillator for resynching? > >In principle, yes. However not directly clocked by the rubidium itself but >from a clean ttl signal that has been made out of the LPRO's sine. There has >been a long discussion here about the "howto" of this. As a good starting >point I suggest this: > >http://www.ko4bb.com/~bruce/CLKSHPR.html > >While the ADCMP600 are available well in Germany (for example from FARNELL) >the MSOP enclosure is very tricky to solder and for a bit less in frequency >performance a LT1016 will do it for you too. > >Best regards >Ulrich Bangert > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
