06-11-2010, 04:42 AM
Crotchety Old Bastard
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Join Date: Apr 2005
Yes, folding the wire back onto it's self is just like cutting it off and works just fine for tuning a dipole. It's also nice 'cuz you can reverse an adjustment without soldering on more wire.
The perspective in that picture isn't easy for me to make out, so I can certainly be wrong about what I'm seeing. The angle between the 'legs' of a dipole can be used for a sort of 'fine' adjustment of SWR. You adjust length for lowest SWR, then start varying that "angle of the dangle" for a 'finer' adjustment of SWR. That works fine until the angle between those 'legs' gets close to 90 degrees. If it ever get's to 90 degrees, you've gone too far. Something on the order of 120 degrees is probably about 'average', or as close as you'll get, sort of. That can vary a lot depending on the antenna's environment.
Having some way of tuning an antenna is a good idea, that tuning is almost always required. The chances of it not being a necessity are very slim to none, actually.
And naturally, any antenna inside will not work as well as that same antenna outside. Lots of 'wiggle' in that, but always true to some extent, nothing really 'new' there. In the end, if it works 'good enough', then it's fine.