I recommend we talk. I am flexible, using 24 bit A/D will blow the budget and there is no way to do it for the cost goal. Bert In a message dated 1/13/2012 11:16:38 A.M. Eastern Standard Time, albertson.ch...@gmail.com writes:
On Fri, Jan 13, 2012 at 3:19 AM, <ewkeh...@aol.com> wrote: > What we know is that you can set the Rb in 7 E-13. Dithering would allow > even closer setting, the question is what rate will the Rb accept with out > loosing lock or deterioration of the performance. Some one should explore > that. I am still waiting to se some aging. Taking the 10 MHz output and than > use an analog loop and something like a Morion OCXO and you have the best of > all. > Digitally controlling the Rb will cut the cost of the control loop in half. > For $10 in parts and a PC board for less than $10 using Shera like > controller can be realized. What is needed is some one able to do the PIC. > If some one is interested and able, please contact me off list. A low cost > GPS or a 1 pps output of a Tbolt be perfect source. > Bert Kehren Don't use a PIC for the prototype. A desktop PC could work as well and everyone here already has one. Connect the FE5680 to the PC's serial port and send commands to adjust it. The PC also needs to be able to read a voltage. Many already have audio input with 24-bit ADC chips. Later you can move the C code from the PC pretty much directly to an AVR. PICs typically use assembly language, that is harder and limits the number of people who can contribute changes to the code. But you can start with a PC, maybe running Linux or BSD. Chris Albertson Redondo Beach, California _______________________________________________ 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.