[time-nuts] Price of LTE Lite GPSDO vs Trimble Thunderbolt.

SAIDJACK at aol.com SAIDJACK at aol.com
Fri Oct 17 18:35:22 EDT 2014


Hello Paul,
 
thanks much, we sent out notice early today to the folks on our list that  
the Ebay store is up and running, and units are selling already. You can 
search  for "LTE Lite GPSDO" and you will find it there. Your email was also on 
that  distributor..
 
The power spec is actually ~160mW for the LTE-Lite module itself not 1/16W  
(we wish!).
 
Please note that the LTE Eval kit has some additional circuitry on it (a  
USB interface chip, a bunch of LED's, and two voltage regulators) so the  
Eval kit power consumption is slightly higher than the LTE-Lite SMT module by  
itself, but you are right having the entire GPSDO consume only  about ~0.2W 
is certainly nice. We did use a linear regulator to go from 5V  to 3.3V on 
the eval board so that is somewhat wasteful, but alas more  quiet.
 
Here is a fun fact: we used an active HP GPS two-to-one antenna splitter to 
 test out two boards. One board was powered up through USB, the second 
board was  supposed to be turned-off. Both boards lit up and worked like a charm 
to our  amusement, turns out the antenna power coming from one board 
supplied enough  backwards power through the splitter to make the second board 
work perfectly  just from that antenna feed.. That mode of operation is not 
advised of course,  but its possible.
 
bye,
Said
 
 
In a message dated 10/17/2014 15:20:51 Pacific Daylight Time,  
paulswedb at gmail.com writes:

Don't  want to hijack any discussion and am looking forward to the ebay site
and  ordering. Whats amazing is the power spec in addition to other specs.  
I
rechecked the spec 1/16th watt at 3.3V. My RB in the basement draws  24
watts just idling along and keeping two hefty SLA batteries charged for  a
48 hour run time if needed.

I can clearly see the case of careful  support system design such that a
battery set can be charged and even in a  power failure run several days on
a small battery.
SLA 7 amp was  something like 100 plus hours. Bert introduced me to some of
the Lithium  battery technologies that can be had for reasonable cost and
are small and  dense.

But that said really no need for a battery since restarts are  fast...
Lots to think about. Like LEDs drawing more power then the system  and
sloppy base power supplies wasting  power.
Regards
Paul
WB8TSL

On Fri, Oct 17, 2014 at 4:53 PM,  Pete Lancashire <pete at petelancashire.com>
wrote:

> Sorry to  create any  misunderstanding
>
> I was saying thanks to  TVB/TAPR for all their effort, and Said/JLT for
> doing what they did  for the group
>
> I was in no way comparing the used Thunderbolts  to the LTE Lite.
>
> -pete
>
> On Fri, Oct 17, 2014 at  1:13 PM, Jim Sanford <wb4gcs at wb4gcs.org> wrote:
>
> >  And, somehow I expect that my LTE-LITE will actually work, which my
>  > thunderbolt never did.  (Very noisy)  It continues to collect  dust....
> > On 10/17/2014 3:49 PM, Pete Lancashire wrote:
>  >
> >> First three cheers to LTE for making these  available.
> >>
> >> It reminds me when Motorola made  a developers kit for the then
> >> new 68HC11 MCU available for  $68.11.
> >>
> >> I know of one design win they got  that more then made of their 
marketing
> >> costs.
>  >>
> >> Another that hit me is with inflation the LTE Lite  is not much more 
then
> >> what many of us paid for our  Thunderbolts.
> >>
> >> For those new to the list  ...
> >>
> >>  https://www.febo.com/pipermail/time-nuts/2008-May/031100.html
>  >>
> >> http://www.leapsecond.com/pages/tapr-tbolt/
>  >>
> >> In 2008, $124, the LTE Lite in 2014 $195.
>  >>
> >> With 'real' inflation (not the 11% you get online)  the $71 difference 
is
> >> not much more.
> >>
>  >> My two backup Thunderbolts cost me $145 each, just before they hit  
$200
> >> then became history.
> >>
> >>  Again thanks to Said and JLT !!!!
> >>
> >>  -pete
> >> _______________________________________________
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