Topband: QST Jun 06 RX Loop
Richard (Rick) Karlquist
richard at karlquist.com
Thu May 18 09:56:51 EDT 2006
> Place ferrite beads over the ends of the shield adjacent to the
> shield gap.
> You will now find that the shielded loop no longer receives anything.
> What happened to the shield's permeable magnetic coupling to the center
> wire? Could it be that currents on the shield's surface were travelling
> around the end of the gap to enter the inside of the shield and
> then couple
> to the center wire? Or mebbe the ferrite beads destroyed the shield's
> ability to continue to be magnetically permeable?
> If someone can explain this, I would like to hear it.
> 73, Doug / NX4D
Explanation: the ferrite beads are also surrounding the inner "antenna".
So that "explains" why it goes dead.
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