[RFI] Ferrite Beads from DX Engineering

[WA3GIN]

Peter,

I asked the DX Engineering fella how best to approach the RFI and he said, 
start with one clamp on per spark wire, then just add more in series till 
the noise is reduced.  That doesn't like an inexpensive solution to me and I 
don't think it will work either, haha.

If I win the lotto I'll buy new spark wires and install 15 beads each and 
report the results ;-)

73,
dave
wa3gin
----- Original Message ----- 
From: "Peter Laws" <plaws0 at gmail.com>
To: <rfi at contesting.com>
Sent: Monday, January 11, 2010 5:45 PM
Subject: Re: [RFI] Ferrite Beads from DX Engineering


On Mon, Jan 11, 2010 at 15:23, Jim Brown <jim at audiosystemsgroup.com> wrote:

> Ferrite beads in pulsed circuits (like spark plug wires) would work
> slightly differently. There, they work by slowing down the rise/fall
> time of the current pulse (or smoothing its corners), which in turn
> reduces the strength of harmonics. It's those harmonics that we hear

Really?

Well, I mean not "really" as in "you don't know what you're talking
about" but as in "wow, the SAE types spend a lot of time getting those
rise-fall times just right so that the car meets the applicable
standards for fuel consumption and emissions" ...  Although not
mandated, there are also drivability concerns as well ...

Just how much would chokes change that?  And how does this compare to
the old "resistor plugs" that were sold to make the ticking on the car
radio go away?




-- 
Peter Laws | N5UWY | plaws plaws net | Travel by Train!
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