Re: [OM] IMG: from Deep Iowa

[Chris Trask]

>
>Interesting.  Once I got through all the pages of mind-bending theory 
>and algebra... it looks a lot like the magnetic loop antennas I've been 
>researching.
>
>The one I've found is based on a sprial of copper sheeting wrapped 
>around a PVC frame to shorten the actual length of the loop. However, it 
>looks like no matter what I'm going to have to invest in a fairly 
>expensive vacuum-variable cap and fabricate some sort of motor drive and 
>limit-sensing mechanism.
>

     That's why I approached the matching problem differently.  That vacuum 
variable capacitor sits at a point where the voltage gradient is highest, and 
it obligates you to use a non-metallic drive shaft to adjust it.

>
>I really miss the days of just climbing up the tower and hanging wires...
>

     I just use a varactor-tuned loop now that tunes 5.5-15MHz.  Much more 
convenient.


Chris
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