On Jan 25, 9:46*am, Cecil Moore wrote:
wrote:
I'd have to make another one to compare
tilting it vertical, vs horizontal.

Again, I'm not talking about any loop in air. I'm only
one example of a ferrite rod loop antenna as exists in
AM radios. Those rods are mounted horizontal within the
radio while the polarization of the transmitted signal
is vertical.

I realize that, but I guess you missed the point.
The point being, I'm not so sure it wouldn't be
responding to mostly vertical polarization no
matter how the antenna was oriented,
unless maybe it was flipped on it's side.
The rods are mounted horizontal, but are
receiving a vertical signal off the ends.
You seem to imply a difference in pattern
using a ferrite bar, vs not using one.
I'm not so sure I agree with that without
more checking.
But like I say, I'd have to rig up some test
dummies to refresh myself.
But.. as I remember from the past versions I
made, the ones I made with air cores seemed
to act exactly the same as the ones with a
ferrite bar as far as pattern. IE: both are
bi-directional off each end and both are
responding to a vertical signal.

wrote:
The rods are mounted horizontal, but are
receiving a vertical signal off the ends.

They don't receive worth a darn off the ends.
The don't receive worth a darn in a vertical
position. They are most effective when positioned
horizontal and broadside to the transmitting
antenna. One can take an AM radio, tune it to a
fringe station and run the test for oneself.
--
73, Cecil http://www.w5dxp.com

On Jan 25, 7:06*pm, Cecil Moore wrote:
wrote:
The rods are mounted horizontal, but are
receiving a vertical signal off the ends.

They don't receive worth a darn off the ends.
The don't receive worth a darn in a vertical
position. They are most effective when positioned
horizontal and broadside to the transmitting
antenna. One can take an AM radio, tune it to a
fringe station and run the test for oneself.
--
73, Cecil *http://www.w5dxp.com

I looked into some of those. And it does change
the pattern when you insert the rod into a coil.
I hadn't realized that. I was thinking the directional
properties stayed the same, with the rod only adding
extra inductance to tune a lower frequency.
I may have to try one of those to compare with
the other loops I use. I saw a few places that
sell large plastic coated rods for this purpose.