Thank you Will remember it. Thought I had stayed within the guidelines. Bert In a message dated 11/13/2010 3:45:21 P.M. Eastern Standard Time, [email protected] writes:
Bert, I just approved your message, so it should show up soon. The reason for the size increase is that the internet email format is 7-bit ASCII, so a binary file has to be encoded down from 8 bits and grows as a result. John On Nov 13, 2010, at 3:32 PM, [email protected] wrote: > Hi > I give up a 113.3 K picture attachment no text turns into 157 K. I tried. > It is particular frustrating when seeing how much bandwidth is wasted with > garbage that has nothing to do with time and frequency. > Bert Kehren > > > In a message dated 11/13/2010 2:14:04 P.M. Eastern Standard Time, > [email protected] writes: > > Hi > > Ok, so right now you are looking at about 10 degrees out of 360 where one > cycle is 100 ns. More or less you are in the 3 ns range. > > Some cheap stuff that will do better: > > HP 5334 > HP 5335 > HP 5345 > HP 5370 > HP 5371 > > All are in the "sub $300" range on the normal sites. Some are sub $100. > All are available with GPIB for logging. > > For a bit more money > > HP 53131 > SR 620 > > You may find one for sub $1000. Often you see them listed for nutty > prices. I certainly would not pay anywhere near $1,000 for either one. > > The one I'd go for is the 5334. It's smaller than the rest. They likely > are the cheapest of the group. The ones I have *seem* to be more reliable > than some of the rest of the stuff listed. > > All of them can run in any one of three modes: > > 1) PPS to PPS timing > 2) PPS to 10 MHz edge timing > 3) 10 MHz to 10 MHz timing > > Number 2 on the list seems to have the fewest issues. > > A completely different approach: > > Pump both signals into a phase detector (RPD-1 or X-OR or what ever) and > use a DVM to log the voltage. You can get some super overkill DVM's for > less than you can get any of the counters. They will easily get you into the > sub ns range on resolution. Weather the setup will be accurate at this or > that level is in the "that depends" category. > > Bob > > > On Nov 13, 2010, at 11:18 AM, Mark Spencer wrote: > >> Hello: >> >> I'm looking for some advice about ways I can compare the frequency of > two gpsdo's. To date I have been using an oscilloscope that supports phase > measurements to measure the small (typically 10 degreees or so at 10 mhz) > change in phase between the two signals over a period of a few hours and then > calculating the frequency change. >> >> I realize this is sub optimal but I wanted to use the gear on hand. > Recently the phase measurement fuction of my scope has stopped working. >> >> As the useage I have ever found for the phase measurement function in my > scope was comparing the frequencies between gpsdo's I'm thinking it might > be better to invest in some other equipment rather then getting the scope > fixed. >> >> Any thoughts as to what could be obtained used for less than 1K that > would be suited for this type of measurement ? >> >> Regards >> >> Mark S >> >> >> >> _______________________________________________ >> 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. > > > _______________________________________________ > 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. > > _______________________________________________ > 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. _______________________________________________ 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. _______________________________________________ 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.
