I agree with Magnus Dual Mixer is the best way to go. That is why over a year ago I set out to develop a system that with counter can be realized for $200. I did reach that goal and Corby tested the first pass and the second pass with 1 E-13 results. He used his SRS counter. Richard who wrote the code for the five PIC's has tested the counter. What is missing some one testing the two combined. I have a total of seven systems out there some on the condition that they get on it with in two weeks. Sad to say it has not happened. I just send out an other kit this week, maybe we will have more luck this time. Once a total test has been done the third set of boards will be ordered and once tested made available for any one. It measures frequency difference and Allan Variance with a resolution 1E-15 the five channel counter runs off USB power and all is needed is along with the reference is a one or ten Hz offset OCXO. I will not mention any names but I would like to remind you what you promised the rest would appreciate the availability of a unit that everybody can build and will be affordable. Attached is the picture of the second pass with HP 10514 Mixer courtesy of Corby. There are only two SMD components! PS I did send it with a picture attached with 113.3 K hoping my text would not take up space but some how it ended up 160K and is on hold. I will try again send only picture! Bert Kehren
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