[time-nuts] LTE-Lite module

SAIDJACK at aol.com SAIDJACK at aol.com
Sat Oct 18 17:40:46 EDT 2014


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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