The QEX unit is a spin off of the Shera, how ever the DAC is only 12 bits covering the full tuning range of the Rb. Shera does it better with 18 bits and has additional features. I would not spend the money to get a copy. Bert Kehren In a message dated 3/28/2014 2:42:55 P.M. Eastern Daylight Time, mgeo...@tuffmail.us writes:
Anders: I am a QEX subscriber and have that issue but I haven't built the circuit. The author referenced Brooks Shera as the basis for his work. He uses a Trimble Resolution T GPS for a PPS reference and an LPRO-101 Rubidium oscillator for the 10MHz. His circuit divides the 10MHz output from Rb by 100 and compares the phase of the 100kHz against the PPS. A PIC16 MCU is the controller and uses the phase data to control an external DAC to drive the Rb frequency control pin. There were a couple of other time & frequency related articles in 2013 if you decide to get the CD. Mike On 3/21/2014 09:20, Anders Time wrote: > Does anyone have a copy of the QEX 2013 november article(Bill Kaune) "Using > GPS to Fine Tune a Rubidium Frequency Standard"? > > I´m really interested in this subject, but I can´t find this magazine in > Sweden. I have contacted QEX, but it is very difficult to buy back-issues. > > Have any one built this frequency standard and can tell me more about the > project? > You can access the source code for the project here: > http://www.arrl.org/files/file/QEX%20Binaries/2013/November_13/11x13_Kaune_PIC_Code.zip > > /Anders > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.