K7AAT:

A loop of 87.5 feet per side (350 feet total) at 35 feet over average
earth shows a feedpoint impedance of 109-j2460 ohms in EZNEC... easier
to match than 8800-j30000 for sure.

73,
Dan

Ed,

517-j7600 for a 300 foot loop at 50 feet
still 110-j2500ish for the 350 foot loop at 50 feet.

This is a rapid fire thread!!

Good point on the multiband original post... didn't read carefully.
For 160 meters, the longer the better over an 80m fullwave. Richard
has a good point about multiband use but the extra length doesn't
change that caveat too much. If you've got an acre of land, it's
probably worth thinking about different antennas for the low bands and
the higher HF bands.

73,
Dan

wrote:
K7AAT:

A loop of 87.5 feet per side (350 feet total) at 35 feet over average
earth shows a feedpoint impedance of 109-j2460 ohms in EZNEC... easier
to match than 8800-j30000 for sure.

73,
Dan

Ed,

517-j7600 for a 300 foot loop at 50 feet
still 110-j2500ish for the 350 foot loop at 50 feet.



Thank you, Dan. I guess I ought to get myself EZNec sometime! It sounds
like what I can put up would "suffice" for 160M occasional operation... I
think the MFJ balanced tuner will handle that.


Ed

Yeah, Ed, I certainly don't mind doing a few quickie models here and
there, happy to do it.

It's worth ordering it, though, when you want to do something like I
did and model the pattern of your your five element 2m beam 16 inches
below your 6m moxon rectangle in the presence of your HF doublet and a
nearby aluminum roof, and generate the pattern for eight azimuth
directions.

It's a great tool to have if you like building antennas, especially if
you have complicated, site-specific improvements you might want to do.

Dan

Thanks to all for your nteresting information!

This evening I found another interesting site about large horizontal
loop antennas, including a very simple but effective tool. It can be
found on http://www.smeter.net/antennas/rjeloop4.php

I will make a horizontal loop of 4 x 25 meters (= 4 x 82 feet) for 160 -
30. And for the higher bands a 14 MHz full-size vertical delta loop.
Both with open feeder line.


--

73,
Hans Remeeus (PA1HR)
http://www.remeeus.eu
Communication is about people, the rest is technology.