From: Mike Nolan <[EMAIL PROTECTED]> Subject: Re: [time-nuts] Making the most of SRS Rb source Date: Wed, 18 Jan 2006 21:58:00 -0400 Message-ID: <[EMAIL PROTECTED]>
> Hi, Hi Mike, Now, considering that I would like to probe a pulsar what would be the typical gear needed? At what frequency do I probe? Just out of curiosity, I don't intend to overtrash my VISA card for that purpose, so you can be calm about that aspect. PS. I should not have bought the GPS clock from that german fellow Heisenberg and put the antenna on my house, because either I know where it is but not when or I don't know when it is but where. :P Cheers, Magnus > > You should definately ask the VLBI people how to deal with the maser. > You definately don't want to touch the frequency reference during an > observation. They really do need the 10^-15 short-term stability. They > can solve for pretty substantial frequency offsets (and linear drifts) > after the fact, but phase noise will kill the experiment. > > If you want a GPS-disciplined Rb, you'd probably be better off buying > one than fiddling with yours if it's really running the telescope. > But I suspect you can do better yourself with practice. Is this the 12m? > > When we got our maser, we did about what you suggest: futz with it > for a month and get it stabilized, then leave it alone as much as you > can. We reset the time if it gets off by 250 ns, and the frequency > occasionally. > Mostly, log what you do, or the pulsar timing people will have a > fit. You may not get much pulsar timing at 100 GHz, but the pulsar folk > have their hands in all pies. > > Sorry if this information is redundant, but and experiment that's blown > becaus of a bad frequency reference is a bummer. > > Cheers, > > -Mike > > -- > Mike Nolan +1 787 878 2612x334 Fax: +1 787 878 1861 [EMAIL PROTECTED] > Arecibo Observatory, HC 3 Box 53995, Arecibo, Puerto Rico 00612 USA > > _______________________________________________ > time-nuts mailing list > [email protected] > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
