[Elecraft] 80 Meter loop question

[Richard Collier]

In my opinion, conditions such as soil conductivity , slope, 
orientation, height, obstacles, metal structures, length of feed line 
etc. vary so much it is almost worth just putting it up without getting 
too deep into modeling. I definitely would model it, I modeled mine and 
then just threw it up thinking it may not work a few bands.  But, after 
trimming it to 3.515 (my magic number, at my location), the K3 tuner can 
tune it everywhere except 160 meters.  Mine is a irregular triangle of 
sorts with the point at 90 to 95  feet in a pine tree and the bottom 
horizontal wire at about 50 feet.    It is somewhere between horizontal 
and vertical (the other two tree tie-offs are at about 50 feet) and fed 
about 15' up one side.  I run 120 feet or so (I trimmed it a couple of 
times) of 450 ohm ladder line into a high power 1 to 1 current balun 
outside of my shack and a 3' piece of high quality coax to my tuner.  
This loop beats my 3 element Cushcraft triband at 45' on the high bands 
about 80% of the time and has exceeded my expectations on 40 and 80.  
Keep in mind it does not have the back or side rejection of the triband 
beam on the high bands.

FWIW,  I did try to orientate it so the the modeled lobes pointed in 
desirable directions on the low bands.  For example, one of the lobes on 
40 meters should be pointed to Europe.  It does work well to Europe from 
the West Coast.

Richard

>>> Does anyone have any information or a link to information data on an
>>> 80 meter loop's complex impedance and VSWR values across the HF bands?