Thank you Karesz. I will contact you direct and we can look at what needs to be done. Nothing Fancy. Bert In a message dated 5/11/2010 10:59:17 A.M. Eastern Daylight Time, szeke...@gmail.com writes:
Hi Bert, I can help you in PCAD schema drowing(i.e. as xxx.pdf output too)_have a litle experiance :-). (so ca. 20 years, & with RF layouting so good 30 years)... Best Greetings, Karesz 2010/5/11 <ewkeh...@aol.com> > The Dual Mixer project is nearing completion. > Let me refresh every ones memory as to my goals. > a) Total cost less than $ 200 > b) 1 E-13 with a one second offset > c) use parts attainable by every one > d) easy to assemble only a few surface mount parts > e) a five channel counter that yields 1 E 15 resolution and interfaces > directly to a PC via RS232 or USB > f) A counter that also gives you instant frequency difference at the > sample rate, not only Allan Variance > g) Modular so one can use only the Dual Mixer > h) Modular so one can use multiple units to do simultaneous comparison of > more than two oscillators. > i) Isolation between D/M and counter so that the counter can be powered > by the PC USB port > > I am happy to report that all goals have been accomplished, attached is a > picture of the D/M, limitation of the file size does not allow me to attach > an actual board picture, but if you contact me direct I will send you one, > the final board is actually nicer since the first layout had to > accommodate > several variances. > > The D/M part leans heavy on the original NIST unit with a few substitutions > and recommendations from Bob Camp. Also beside Opto Couplers SN65LVDS1's > have been included for those that want to use other counting methods. > Selection of filter capacitors allow the use at other offset frequencies > such as > 10 and 100 Hz. The D/M fits in a standard 74 X 111 X 20 mm Euro case and > the counter can be stacked below or next to it using the Opto Isolators as > the inter connect. The SYPD-1's fit right on the board but connections are > included to use the HP 10514 A. As a matter of fact removing the HP mixer > board from its housing fits it nicely on the board and every thing is > still > inside the housing. > The counter will handle 1 an 10 Hz offset with a 1 E 14 resolution at 10 > Hz. Thanks to Richard Mc Corkle we have great drawings and code, available > to > every one. > Code, drawings, list of material and PC board layouts and its file, will > be available to every one once the project is completed. > I need help in the following areas > a) help me create a nice set of drawings that are computer generated > something I am not able to do > b) create the computer program that takes the output of the counter board > and allows Allan Variance plots, frequency difference and dual temperature > readings and plots using RS232 and USB. > c) an independent test by a third party. > As I said previously, I am not getting in the business of supplying parts > but will work with people that will help achieve the three points listed > above. Presently I have boards on order and will have two uncommitted > board > sets and probably also component kits. > Please contact me directly. > Again thank you Corby Dawson, Richard Mc Corkle and Bob Camp. > Bert Kehren Miami > > > _______________________________________________ > 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.