[Elecraft] Loop Antenna observation

[Ken Kopp]

I've used 6' diameter, single-turn-of-hardline loops on 80 
and 160 for many years ... with simple transistor amps built
into the termination boxes ... and fed via (cheap) CATV type
RG-59 over hundreds of feet.  Two have been powered 24/7 
for over 20 years (!).

Yes, if built carefully they have VERY deep and narrow, but
equal nulls off the sides ... or put another way, along a line 
through the loop.  I found there's little (no) need to rotate them
UNLESS you want to use the null to attenuate the signal 
from a nearby station ... as in a contest situation.

A word of caution ... if building for transmitting, the currents
in the loop ... and the tuning capacitor ... will be extreme.
There will be heating and since the Q is so high this will
result in drifting of the resonance point.  This is the main
headache for transmitting loop builders.  

I had the use of AEA's very first production-line loop many
years.  It worked very well.

73! Ken Kopp - K0PP
k0pp at arrl.net
or
k0pp at ixpres.com