[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.
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
> This design can work up to 145MHz according to the 74LVX74 datasheet if
> powered at 3.3V.
> 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.
> 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.
> > thanks for answering some of these already!
> > Dave, as Bob said "it depends on your application" -- and your time
> > Also, please check the FAQ for an answer on the external TCXO
> > 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
> > 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
> > as clean as it is I guess the TimePod software could only find two
> > 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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