[time-nuts] Dual Mixer
K. Szeker
szeker.k at gmail.com
Tue May 11 15:12:47 UTC 2010
OK Bert!
Im wayting on your scripts...
K.
2010/5/11 <EWKehren at aol.com>
> 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,
> szeker.k at 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 <EWKehren at 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
> >
> >
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