This sounds to be a very similar method that my Tracor 895A uses. Does that sound correct?
-Brian, WA1ZMS -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of Neville Michie Sent: Saturday, November 08, 2008 5:09 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Checking accuracy of Rubidium standards Hi, I have a plan which involves the dividing down of the 10MHz of a GPSDO and a rubidium (LPRO) to about 1MHz or 100kHZ and applying them to a XOR or D latch to get a PWM signal that can be averaged for a strip chart recorder or 12 bit analogue data logger. The DC output gives a range of 5 volts for one microsecond or 10 microseconds phase difference and folds back if this difference is exceeded. The data from the datalogger is in a format that a spreadsheet can use. With time and phase measurements I wonder how hard it is to get Allen variance. I realise the PWM method requires a low pass filter and this will prevent short period variances from being calculated. cheers, Neville Michie 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.
