Thanks for the reply, it would seem this article disagrees with that.
Thanks,
Charles

http://archives.e-
insite.net/archives/ednmag/reg/1997/112097/24col.htm

> One Word.... Termination impedance.
>
> "cflat@ev1.net" wrote:
>
> > Hi, I am out of my knowledge zone and thought I would pose this
> > senario to the minds of this list for help.  I have a PIC16F877 that
> > outputs a pulse of 200us duration every 2ms (500Hz pulse).  I need
> > to send this pulse up to 350 feet down a cable.  This cable has 3
> > conductors that aren't twisted (have no choice but to use this
> > cable, more wires not an option) which are 18awg stranded.  Two of
> > the wires are carrying 24V dc and the 3rd wire should carry the
> > pulse.  The pulse is ground referenced to the positive 24V lead.  I
> > have 5V on the receiving PCB also referenced to the 24V positive
> > wire.  When looking at the pulse on the scope, it is a nice clean 5V
> > square pulse coming off the board.  At the other end of the cable
> > where it is received by another circuit board, it has a slight bit
> > of ringing on the 0 to 5V transition and has a lot of ringing on the
> > 5v to 0v transition.  I had a 74HC14 on hand and put it on the
> > receiving PCB and connected the signal through 2 gates but it didn't
> > help.  I think the ringing is too great a level.  If anyone knows a
> > good way to get a clean signal or clean up the signal I'd be
> > greatful for help. I've been searching the net for info and it would
> > seem a differential method would be preferrable but I don't have an
> > extra wire so its not an option.  Thanks for any help. Charles
> >
> > --
> > http://www.piclist.com hint: To leave the PICList
> > mailto:piclist-unsubscribe-request@mitvma.mit.edu
>
> --
>   *
>   |  __O    Thomas C. Sefranek   tcs@cmcorp.com
>   |_-\<,_   Amateur Radio Operator: WA1RHP
>   (*)/ (*)  Bicycle mobile on 145.41, 448.625 MHz
>
> http://hamradio.cmcorp.com/inventory/Inventory.html
> http://www.harvardrepeater.org
>
>
>

--
http://www.piclist.com hint: To leave the PICList
mailto:piclist-unsubscribe-request@mitvma.mit.edu