On 11/2/2015 7:39 PM, Jeff Liebermann wrote:
On Mon, 2 Nov 2015 09:13:38 -0600, amdx wrote:

Below some pressure level, it will probably flop over if mounted
vertically. That's why I mumbled that I wasn't sure if it should be
mounted vertically with a support pole, or horizontally on a flat
sheet of plywood. Both will work, but I'm not sure which is better.

Hang it upside down.
Mikek

But, all the photons will fall out of the loop that way.

Actually, there's a problem. It doesn't work as well upside down.
The magnetic loop has a rather directional field and takeoff angle and
does NOT have a constant current around the loop:
http://www.nonstopsystems.com/radio/vids-ant/antenna-Mag-Loop-Demo1.wmv

I don't get this video. I can't really hear what he is saying so when
he says at the end, "this is not what you would expect" I don't get it.


https://www.youtube.com/watch?v=SUYI81dkEMA

This video is about the voltage and current around a loop, but he says
it is a 1/10 wave loop, but I can't tell that. He has another video
showing the directionality of a 1/4 wave delta antenna. I'm wondering
if this is also a 1/4 wave antenna.


I suspect that an inverted loop will send most of the RF into the
ground. I should probably test this.
http://www.nonstopsystems.com/radio/img-ant/antenna-magloop-rad-angle.gif

Which type of loop antenna are you talking about, 1/4 wave, or 1/10
wave (small, magnetic)? I can't tell anything about this antenna and it
seems to contradict the other video.


You might find this interesting on designing the 50 ohm matching
network to the loop, where the impedance varies by where it's fed:
http://www.g0cwt.co.uk/magloops/new_page_6.htm

--

Rick