On Wed, 2 Feb 2011 09:35:38 +0100, "Antonio Vernucci"
wrote:

This is clearly due to the fact that the external body of the trap (an aluminuim
can about 2 feet long), which contains two coils resonated at different
frequencies by means of built-in capacitors, is effectively part of the antenna
radiating element. So, the trap is a bipole not only comprising lumped elements,
and that is the reason why it cannot be inverted.

Hi Antonio,

No, in fact.

You clearly state in the first sentence the reason why.

The external body renders an asymmetry. The two elements it separates
are also non-symmetrical (both physically and electrically).

This is NOT a lumped circuit exercise that has gone bad.

73's
Richard Clark, KB7QHC