Hi Murray, Why did you use such a large division factor - or any for that matter? Could you not just have used a PLL with very long time constant running at 10 MHz?
Peter On 27 June 2010 20:14, Murray Greenman <murray.green...@rakon.com> wrote: > I have a design which locks a high performance 10MHz OCXO to a 10MHz > source which should work equally well with the LEA5, or any source of 5 > or 10MHz. > > I designed it for use with a distributed factory GPS reference which has > picked up noise, hum and phase modulation, in order to deliver a high > quality but GPS locked reference direct to equipment. The design adds > nearly three orders of improvement. > > Essentially it divides the incoming 10MHz by 16384 and compared the > phase with a similar division from the OCXO, within an ATTiny2313 micro. > The phase detector is a D-flip-flop type implemented in software (in > interrupts), and it delivers a locked reference with ADev around 10e-12 > for Tau between 1s and 20s. The micro also keeps a real time clock and > does various background monitoring and telemetry tasks. There is PC > monitoring software as well. There are only four chips in the design. > While I can't share the code (belongs to my employer), the idea is > simple enough and I could share the schematic. > > Eight of these units have been built. I used the excellent Rakon > STP2402E OCXO. > > > Regards, > Murray Greenman ZL1BPU _______________________________________________ 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.