[time-nuts] C-Max Receiver Experiment

Justin Pinnix justin at fuzzythinking.com
Sun Oct 30 21:11:06 EDT 2011


Hi Brent,

I actually saw that warning partway through the experiment.  I disconnected
it and didn't get any measurable difference.  So, I put it back - it makes
it easier to see what's going on :-)

Based on several suggestions here, I think the next thing I'll try is
capturing actual event arrival times.  That will allow me to plot a
histogram and let the experiment run all night (and day) to take advantage
of different local times.  Plus it gives me an excuse to buy (or build) a
universal counter.

Thanks,
-Justin (AJ4MJ)

On Sun, Oct 30, 2011 at 7:00 PM, KD0GLS <kd0gls at mninter.net> wrote:

> Justin,
>
> A while back, I did some crude experiments with the C-Max CME6005 IC which
> is, I believe, used in that evaluation module. If memory serves, there were
> some rather severe restrictions documented in either the datasheet or an
> application note regarding the loading on the TCO/TCON pins. As I recall,
> it recommended a very minimal load (much less than what an LED might draw)
> and to not use the TCO and TCON outputs simultaneously. They claimed
> violating these recommendations would interfere with the receiver's
> operation, although I find it hard to believe. I'm certainly not suggesting
> this explains your results, only that you might want to look into it.
>
> Regards,
> Brent
>
> On Oct 30, 2011, at 16:09, Justin Pinnix <justin at fuzzythinking.com> wrote:
>
> > Nuts,
> >
> > I recently picked up a C-Max evaluation kit from SparkFun to see if this
> > $10 board could be used as a precision timing source.  The short answer
> is
> > no.  The long answer is available at:
> > http://www.fuzzythinking.com/?page_id=29 .
> >
> > It was a fun experiment and a great excuse to play with test equipment
> :-)
> >
> > Thanks,
> > -JP
> > _______________________________________________
> > 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