[time-nuts] LTE-Lite module

[Bob Camp]

Hi

The 20 MHz connects only to pin 3.

+3V connects to pin 4 , but not pins 2 or 3.

Pin 6 hooks only to pin 2 and nothing else.

Bob


> On Oct 18, 2014, at 8:23 PM, Dr. David Kirkby (Kirkby Microwave Ltd) <drkirkby at kirkbymicrowave.co.uk> wrote:
> 
> 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.
> 
> Dave
> 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
>> 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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