[time-nuts] LTE-Lite module
tmiller11147 at verizon.net
Sat Oct 18 20:48:05 EDT 2014
This looks pretty interesting:
74G series PO74G74
600+ MHz cmos 3.5 volt
----- Original Message -----
From: "S. Jackson via time-nuts" <time-nuts at febo.com>
To: <kc0wjn at gmail.com>; <time-nuts at febo.com>
Sent: Saturday, October 18, 2014 5:40 PM
Subject: Re: [time-nuts] LTE-Lite module
> 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
>> I hope that answers all questions,
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