[time-nuts] Last Call Group Buy Ublox LEA-6T

[EWKehren at aol.com]

That is why we stay with Ublox 5T for saw tooth correction and 6M for what  
I call PLL applications where you can change the 1 pps to higher frequency 
to be  used in a PLL.
Maybe we will one of these days see 1 ns on ebay. I am sure NDA's prohibit  
the company from resale of chip
Bert Kehren
 
 
In a message dated 5/19/2016 8:00:59 P.M. Eastern Daylight Time,  
kb8tq at n1k.org writes:

Hi

Well, the first step is to talk to the outfits about you  weekly usage rate 
of the 
chip sets. In some cases anything under 10K chips  a day simply isn’t 
interesting to 
them. After that you sign their NDA and  they sign your NDA. After both of 
the
lawyer teams are happy that the right  signatures are in the right places, 
you 
get access to the basic info. From  there you go back and forth a bit about 
what
can or can’t be done.  

Next step is to get a spec on an actual chip set and the design data  for 
it. You then
are off to source this and that odd part needed to  complete the design. 
After that you
do a board layout. Almost inevitably  that’s an HDI board. Spend $5K or 
more on the first
panel of boards and  wait 30 to 60 days to get them (in one case it was 90 
days, they  goofed
twice in a row). 

Boards come in. Send them off to pick and  place for assembly.  Then you 
find out what 
you did or didn’t miss in  the spec and if your choice of odd parts to 
complete the design 
actually  work or not. Figure on a re-spin of the board as a real 
possibility.  

Assuming it passes a basic smoke test, off to see how it does as a  timing 
receiver. Maybe
it works. Maybe there are bugs. Maybe the bugs can  be fixed …. maybe they 
can’t. Likely
that part is a few months at least  before all the emails are sorted out 
and there is a decision. 

Off to  the next vendor and the same process on their chip set … then the 
next one  ….
then the next one …. then the next one.  Same process every time.  Same NDA’
s same
gag order as a result. Ultimately you can get a part that  will give you 
about +/- 1 ns 
without sawtooth correction and who knows how  much better with sawtooth. 
Since the 
sawtooth is part of the NDA stuff, I  can’t even tell you who that is… 
Here I’m simply
talking about resolution  and the range of the un-corrected pulse. 

Bob



> On  May 19, 2016, at 4:21 PM, David <davidwhess at gmail.com> wrote:
>  
> On Thu, 19 May 2016 15:30:05 -0400, you wrote:
> 
>>  ...
>> 
>>> You can see this phenomena with the LEA  modules quite clearly: 
>>> The LEA-4, -5, -6, -7 and -8 modules  all use an internal 48MHz clock. 
>>> Even though there were 2  complete overhauls of the system in this ~13 
year
>>>  timespan.
>> 
>> Which is why a lot of outfits have  abandoned uBlox and moved on to other
>> outfits that didn’t stall  out.
>> 
>> Bob
> 
> Could you give some  examples?  I have been reviewing the uBlox and
> other modules for  my own project but maybe there are better options
> that I have  missed.
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