Re: gEDA-user: basic anti-EMI design q

[Karel Kulhavy <clock@xxxxxxxxxxxxx>]

On Fri, Mar 24, 2006 at 06:03:04PM +0100, Bill Sloman wrote:
> At 12:52 24-3-2006, Karel Kulhavy wrote:
> 
> >On Fri, Mar 24, 2006 at 11:04:04AM +0100, Bill Sloman wrote:
> >> At 05:21 24-3-2006, you wrote:
> >> >DJ Delorie wrote:
> >> >
> >> >>It's not the drivers that mess up, it's the octal latch.
> >> >
> >> >
> >> >if the existing latch is in the interface with ribbon cable to the
> >> >PC  - there's your problem.
> >>
> >> Have you grounded every second wire in the ribbon cable? It sounds
> >> extravagant, but if you need shielding, that's a commonly used way of
> >> getting it.
> >
> >It isn't. If it were, there would be no rule that UTP cables should be
> >put min. 20cm apart from power lines.
> 
> Unshielded twisted pairs being used where and for what purpose, Karel?

Czech Republic, Ethernet.

> 
> There are so many possible explanations for this requirement, in so 
> many possible contexts, that it seems unlikely that this "rule" 
> actually supports your claim.

What other explanation comes to your mind apart from interference
problem?

CL<
> 
> Bill Sloman, Nijmegen
> 
> 
>