[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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> >
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