[EMAIL PROTECTED] wrote: > Hi Didier... > > The "official" readings are taken for the band that is announced. > > Even though the exciters at W1AW are left on for an extended period of time > before the test, there is some drift during the > test period. > > I would suggest that you listen on 160 and 40 meters during the callup to > determine wether you have a shot on those bands or not. > > > > If you are going to submit in the tenths of Hz, I would suggest that you > only measure during the announced time for that band. > > Good Luck!! > > > 73, Don, W4WJ > When measuring a single CW carrier, I would use the 3586A in direct mode. Its counter has 0.1 Hz resolution, and it has an Ovenair OCXO that has specs equivalent to the HP 10811 (2e-7/year). Unless I get my GPS disciplined oscillator working by then, I'll be lucky if I am able to calibrate it within 0.2 or 0.3 Hz against WWV at 10 or 15 MHz, that will get me within 0.1Hz or so at 3.5 MHz. That should be a no-brainer. Greater accuracy is probably not achievable because of atmospheric variations, the rest will be luck. I think I will run the 3586 set to WWV with my GPIB logging software for a few days to see what kind of variations I get during the day and try and find the best time to calibrate. Also, we have the cal lab people (company called TMI) coming next week as they do twice a year to calibrate a bunch of instruments on site where I work. I am trying to find what kind of frequency standard they have, but I may bring the 5370 and ask them to check the time base. We have a bunch of microwave gear that needs to be calibrated to factory specs, traceable to NIST per MIL-STD, so I would guess they have to have at least a good rubidium or a GPS locked reference. If I get my GPS working, I would try John's method. He has done a good job documenting it. Unfortunately, while I have a bunch of machines running Linux, they all run in the command mode, so I can't use the graphical spectrum analysis software he is using :-(
Didier KO4BB _______________________________________________ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts