[time-nuts] LTE-Lite module

Dr. David Kirkby (Kirkby Microwave Ltd) drkirkby at kirkbymicrowave.co.uk
Sat Oct 18 20:23:57 EDT 2014


I am sorry, but I can't follow the circuit diagram.  It is not clear to me
what pins are joined,  and what are not. Sometimes you have used a filled
circle to indicate lines are joined,  and in another case there's a
semicircle to indicate that they are not. But on some of the others,  I
don't know what are supposed to be joined and what are not.

Dave
On 19 Oct 2014 01:00, "S. Jackson via time-nuts" <time-nuts at febo.com> wrote:

> Dave, et.al.,
>
> upon popular request I put together a PDF of my email describing how I
> generated a low-phase-noise 10MHz output from the CMOS 20MHz output of the
> LTE-Lite GPSDO. Here it is.
>
> No guarantees whatsoever guys, and it does take good equipment, a very
> steady hand, and a lot of experience to put this together and make it work
> properly.
>
> This design can work up to 145MHz according to the 74LVX74 datasheet if
> powered at 3.3V.
>
> bye,
> Said
>
>
> In a message dated 10/18/2014 14:09:54 Pacific Daylight Time,
> kc0wjn at gmail.com writes:
>
> Hi,  Said.
>
> I would be interested in having a copy of your "app-note", if  that is
> possible. I'd like to purchase one of the GPSDOs, but will need to  wait
> for amonth or so.
>
> Thanks.
>
> Cheers,
> DaveD
>
> On  10/18/2014 12:19 PM, S. Jackson via time-nuts wrote:
> > Hi  guys,
> >
> > lots of questions, let me try to answer  some of these. Bob, David, et.
> al,
> > thanks for answering some of these  already!
> >
> > Dave, as Bob said "it depends on your  application" -- and your time
> frame.
> > Also, please check the FAQ for an  answer on the external TCXO
> requirement,
> > specifically item 35. in the  FAQ on the Ebay website for the product.
> >
> > Jim, I  ended up doing the "appnote" in email format, and sending out a
> >  description, schematics, PN plot, and photos yesterday, please check
> your
> > emails. I won't do a formal appnote, sorry no time.. I hope the
> description of
> > what I wired-up yesterday is good enough for folks to  try the same.
> >
> > Ernie, as mentioned here the price  is $185 plus shipping on Ebay for the
> > entire kit. Shipping is  calculated by Ebay, and should be a flat-rate
> of $10
> > in the  continental US
> >
> > Hal, MY BAD!! I should have known  better and super-imposed both the
> > original 20MHz and 10MHz plots on  the same plot. I will do so shortly.
> On the
> > table in the plot: the  TimePod tries to determine spurs, and display
> them  on
> > the upper  right hand of the plot in a table, and with the phase noise
> being
> > as  clean as it is I guess the TimePod software could only find two
> spurs,
> >  one at  0.8 and one at 0.9Hz offset from carrier, which was not even
> shown in
> > that plot  since it starts at 1Hz.
> >
> > Thanks so much for your feedback, lively discussion, and good  questions
> > guys.
> >
> > I hope that answers all  questions,
> > bye,
> >  Said
> >
>
>
>
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