[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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>
>
>
> --
>
> 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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