[time-nuts] Trimble Thunderbolt 1pps

[Chris Albertson]

Where those using the cat-5 wire as a twisted pair?  If sothat's "cheating"
I was truing to send an RS232 signal down a cat 5 cable.  That means Tx, Rx
Gnd and DCD.  You need four wires for that, ethernet uses the other two
pair.    I was using the pairs Ethernet does not use.

The solution was to just not do it.  I swapped out the entire system so
that now the computer is a $20 ARM based NAS that I re-flashed moved
physically close.


> Here are scope pictures from the PPS signal from a TBolt driving 100 feet
> of
> various types of wire:
>   http://www.megapathdsl.net/~hmurray/time-nuts/coax/Coax-20ns.png
>   http://www.megapathdsl.net/~hmurray/time-nuts/coax/TP-20ns.png
> The clump on the left of each graph is the input.  The stuff on the right
> is
> the output.  The scatter is due to the different prop times.
>
>



-- 

Chris Albertson
Redondo Beach, California