[Elecraft] Experiences using a portable HF loop

[John Huggins, kx4o]

Small loop efficiency is relatively dismal, but as G8HQP once said
concerning this topic...

“That would depend on what you mean by 'efficient.' Probably not efficient
in the usual engineering sense of power out vs. power in, but perhaps
'efficient' in the common meaning of being able to do the job of radiating
something from a small space.”

My small space and portable (or to some lugable) example here...

  http://www.hamradio.me/antennas/small-loop-hf-antenna.html

...performs surprisingly well on 40m despite the losses, hence supporting
G8HQP's premise.

An additional important thing to keep in mind is the seriously high E and
H fields around these things even with QRP power. The H field especially
exceeds MPE limits a couple meters out along a line through the plane of
the loop. Some folks operate next to their loops... not me man.

Small loops are an enigma at first, but part of the fun is unraveling the
mystery through experimentation. Join us.

73
john, kx4o

On Sat, April 22, 2017 01:24, Eddy Avila wrote:
> Greetings all, I'm curious to hear from anyone using a portable HF
> magnetic loop. I've read the theory behind them so I'd like to hear your
> opinion about them? How efficient these antennas are, especially running
> qRP.
>
>
> Thanks all,
>
>