On Wed, 30 Mar 2005 06:33:36 -0600, "hasan schiers"
wrote:

Hi Hasan,

By the numbers:

1. Where along the wire should they be placed (at the plug, at the
distributor, middle of wire)?

Doesn't matter.

2. Should they be stacked next to each other for better effect (series
butted up against one another) and if so, how many, and again, where along
the wire?

Doesn't matter.

3. How many should be used and as above, how should they be "clustered"?

Until you achieve relief (you haven't described why you want to do
this).

4. Are these likely to be significant help on either HF or VHF?

By the presumption of this indicating a receiver problem with HF or
VHF, I would offer that most (modern) cars do not display such
problems. You could be chasing the wrong solution. However, at the
bottom line, they could help.

5. Can anyone recommend a really good set of ignition wires for best RFI
suppression?

Standard resistive wires. It sounds like you substituted straight
wires for the factory set when they wore out. That is generally a
poor choice for two reasons. One (presumably) is due to ignition
interference with communications. The other is lowered fuel economy
and power.

The application of ferrites to straight wires is introducing resistive
loss into the ignition current path. This is normally the job of
resistive wire. Introducing such loss is actually a boon. The loss
retards spark extinction (means that the spark will burn longer with a
resistance in the path). Longer burn time means more complete
ignition. This also means that the longer burn time equates to fewer
HF spurious products. This is called win-win.

73's
Richard Clark, KB7QHC