Re: [time-nuts] Updated VLBI tutorial available on gpstime.com
Tom Clark, K3IO wrote: > Next week the VLBI community is having another TOW (Technical Operations > Workshop) at the Haystack Observatory NW of Boston. Tom, I work a few miles down the road from Haystack ... any chance we could get together for dinner on Tuesday May 1 to talk timing/AMSAT? -Joe KM1P ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
Re: [time-nuts] Updated VLBI tutorial available on gpstime.com
Brooke Clarke asked: > I didn't see in the VLBI slides what was done to "tune" the delay > line, but did see a hint that there's been a firmware upgrade for it. > Can you elaborate? Rick's latest version uses a delay line with more per-bit precision (now 150 psec steps). We also found that Motorola (correction byte) and Maxim/DSI (delay line bits) seemed to use different definitions of "one nsec" and Rick needed to sort out a scale difference (the reason my new slides #29 & 30 are different from what's in our PTTI talk). I think Rick got the cursor clock code from TvB. 73, Tom ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
Re: [time-nuts] Updated VLBI tutorial available on gpstime.com
Hi Tom: I didn't see in the VLBI slides what was done to "tune" the delay line, but did see a hint that there's been a firmware upgrade for it. Can you elaborate? I like the Cursor Clock on your web page. Have Fun, Brooke Clarke http://www.PRC68.com http://www.pacificsites.com/~brooke/PRC68COM.shtml http://www.precisionclock.com Tom Clark, K3IO wrote: > Next week the VLBI community is having another TOW (Technical Operations > Workshop) at the Haystack Observatory NW of Boston. The audience for the > TOW is mainly the technicians at each site who drive the telescopes and > keep the hardware running. VLBI is crucially dependent on timing and > every station is equipped with at least one Hydrogen Maser. As usual, I > have been tapped as the timing "teacher". > > My PowerPoint class notes "Timing for VLBI" are now posted available on > http://gpstime.com/. > > These notes include some fairly recent data on how well the new > real-time "de-sawtooth" hardware in Rick's CNS Clock II works as > compared with the software correction we have been using for many years > (the two agree to 300 psec RMS now that we learned how to "tune" the > programmable delay line). > > 73, Tom > > ___ > time-nuts mailing list > time-nuts@febo.com > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
[time-nuts] Updated VLBI tutorial available on gpstime.com
Next week the VLBI community is having another TOW (Technical Operations Workshop) at the Haystack Observatory NW of Boston. The audience for the TOW is mainly the technicians at each site who drive the telescopes and keep the hardware running. VLBI is crucially dependent on timing and every station is equipped with at least one Hydrogen Maser. As usual, I have been tapped as the timing "teacher". My PowerPoint class notes "Timing for VLBI" are now posted available on http://gpstime.com/. These notes include some fairly recent data on how well the new real-time "de-sawtooth" hardware in Rick's CNS Clock II works as compared with the software correction we have been using for many years (the two agree to 300 psec RMS now that we learned how to "tune" the programmable delay line). 73, Tom ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts