[time-nuts] LTE-Lite module

SAIDJACK at aol.com SAIDJACK at aol.com
Sat Oct 18 21:44:45 EDT 2014


Thanks for helping out Bob,
 
sometimes I get ahead of myself.
 
Dave, you can also trace the wiring on the photo I had sent of the  actual 
module, its more or less clearly visible under the lupe. Please note that  
on that module I mounted the IC upside down, with the pins sticking up, and  
bending the grounded pins down toward the PCB.
 
bye,
Said
 
 
 
 
In a message dated 10/18/2014 17:55:36 Pacific Daylight Time, kb8tq at n1k.org 
 writes:

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
>>> 
>> 
>> 
>> 
>>  _______________________________________________
>> time-nuts mailing  list -- time-nuts at febo.com
>> To unsubscribe, go to
>>  https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>> and follow  the instructions there.
>> 
>  _______________________________________________
> time-nuts mailing list  -- time-nuts at febo.com
> To unsubscribe, go to  
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the  instructions  there.

_______________________________________________
time-nuts  mailing list -- time-nuts at febo.com
To unsubscribe, go to  
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the  instructions there.




More information about the time-nuts mailing list