Re: Can a loop be shielded from one side? -FARMERIK
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The problem with steering loops is they only respond to the magnetic component of a radio wave not the electrical one that a wire or rod uses.
I think it’s pretty difficult to block the magnetic component. You can use phase cancelling to steer the reception pattern. It doesn’t block the signal, it matches the undesired one with a completely out of phase version. Get the two to exactly the same strength and the bad one disappears. Mark Connolly has done a lot of amazing work on phasing and steering loops. But it sure isn’t as simple as putting a metal shield behind the loop.
You can also do something similar by using more than one loop in an array. The distance between loops and the way you angle them can favor a certain direction.
The rock cliffs probably work well on sky wave propagation, such as Trans Pacific signals. Might not do so well blocking Ground Wave signals that tend to travel along the earth.
A beverage antenna uses the resistor connection to its ground rod to eliminate signals off the back end.
On Oct 6, 2018, at 12:36 PM, Andy ai.egrps@... [ultralightdx] <ultralightdx@...> wrote: