It is a circuit that they for instance use in the 2110 where they take the reference input in case of 10 MHz divide by 2 and also divide the 5 MHz down to 500 Hz use an exor and out comes 5.000500 MHz filtered and divided by 5. The result is 1.000100 MHz which is mixed with the unknown divided to 1 MHz. The result is 100 Hz counted with a 100 MHz period counter and you have 1 E 12 in a second. My counter which is part of the system and thanks to Richard MCC is a PIC, has 0.1, 1, 10 and 100 seconds gate time. The 100 or 200 MHz are generated from the reference channel. All logic is in a MAX3000A G/A. The output is RS 232 and can also be stored on a USB memory stick, no PC needed. Austron uses a Xtal as a filter and I use 2 because I do not have access to their Xtal but it works. A nicer solution would be to use an AD 9833 DDS but it would require an additional PIC to do the math since the DDS can not produce an exact 1.000100 MHz. If some one is willing to do that chip please contact me off list. Bert Kehren In a message dated 4/20/2012 6:56:14 A.M. Eastern Daylight Time, att...@kinali.ch writes:
Moin On Thu, 19 Apr 2012 18:18:24 -0400 (EDT) ewkeh...@aol.com wrote: > I have quite a collection of equipment and have build Dual Mixer, PICTIC > and what I think is best for you a circuit I call the Austron circuit. What is this "Austron Circuit"? And how does it look like? :-) Attila Kinali -- The trouble with you, Shev, is you don't say anything until you've saved up a whole truckload of damned heavy brick arguments and then you dump them all out and never look at the bleeding body mangled beneath the heap -- Tirin, The Dispossessed, U. Le Guin _______________________________________________ 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.