> HI All , first time request. I wish to know how I can accurately set some > oscillators on frequency. I have 3 Sulzer oscillators .. 1 x 2.5A and 2 x > 2.5C's and 1 matching P/S with dead nicads.
> My main reference is a Trimble Thunderbird which was the second source to > the HP unit was used in cellular phone installations in the US a while ago I > think that they maybe Nortel pulls like the HP's that were around. > I have tried in the past by putting the main reference into input "A" and > triggering 1 cycle of 10 MHZ and feeding one of the other oscillators into > input "B" and adjusting the Sulzer to be totally overlaid with no movement > over many hours.. All Sulzers had been on for 36 hours before the test.and > the Trimble has been on for 2 years. > What accuracy can I expect from this method, and is there a better method > with the equipment I have. > Regards, Don VK3YV....... It would depend on the specs of the time interval or frequency counter you're using. You mention, 1 cycle of 10 MHz; that's 100 ns. And you mention "many hours". The upper limit based on that alone is 100 ns over, say, 10 000 seconds which gives you a resolution of 1e-7 / 1e4 seconds = 1 part in 10 to the 11th. That's than enough accuracy, since, during that couple of hours a 36-hour warmed-up Sulzer will likely have drifted in frequency by about that amount. /tvb _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
