[Lowfer] loops

[lowfer@mailman.qth.net]

All excellent points. Yes, the formula I gave works but I seem to have 
trouble inputting the correct number of zeros into my calculator! Yes, the 
253 u ohms looks better than 2 u ohms. 

And with a real loop (lossy) the signal does increase only 3 dB between a 
one-turn and a two-turn. Where's that room temperature super conductor when 
you need it? I haven't seen any 2-turn loops commercially made.

I don't know what the range of good spacings would be for a two-turn loop. A 
good point was brought up about detuning as the two loops move. This would 
certainly enter into the calculations/simulations. Real close and proximity 
effect increases the losses. And the loop-to-loop capacitance is higher and 
changes in loop spacing detune the loops. Really far apart (like one loop 
diameter) and what is the affect? I would want to simulate this and graph the 
results. Resonant frequency versus spacing, and efficiency versus spacing.

But, the NEC-2 I use does not seem to handle lossy loops. With a perfect 
conductor (and setting the source to a constant current) I get the expected 
radiated power. But if the conductor is set to anything other than perfect, 
or load resistors are placed anywhere in the loop, the radiated power is 
shown to increase markedly. I just noticed this at work this when simulating 
a tiny loop at UHF (smaller electrically than a "big" lowfer loop). 

    Dave


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