[time-nuts] LTE-Lite module

Bob Camp kb8tq at n1k.org
Sat Oct 18 22:23:52 EDT 2014


Hi

Didn’t we just hash through all the Potato Chip stuff earlier this week when Bert brought them up?

Bob

> On Oct 18, 2014, at 9:51 PM, Thomas S. Knutsen <la3pna at gmail.com> wrote:
> 
> The potatochips are quite excelent high speed devices, and by selling them
> on e-bay, they make it avaible to us who are not able to go through the
> normal supplier chains.
> 
> Br.
> Thomas.
> 
> 2014-10-19 2:48 GMT+02:00 Tom Miller <tmiller11147 at verizon.net>:
> 
>> This looks pretty interesting:
>> 74G series PO74G74
>> 
>> http://www.ebay.com/itm/330551715157?_trksid=p2060778.
>> m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT#ht_411wt_664
>> 
>> 600+ MHz cmos 3.5 volt
>> 
>> Tom
>> 
>> 
>> ----- 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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>>> 
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> 
> 
> 
> -- 
> 
> Please  avoid sending  me  Word  or  PowerPoint  attachments.
> See  <http://www.gnu.org/philosophy/no-word-attachments.html>
> PDF is an better alternative and there are always LaTeX!
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