OK Bert! Im wayting on your scripts... K. 2010/5/11 <[email protected]>
> 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, > [email protected] 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 <[email protected]> > > > 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 -- [email protected] > > To unsubscribe, go to > > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > and follow the instructions there. > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
