[time-nuts] LTE-Lite module

Tom Miller 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
> 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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