On 1/2/20 11:28 PM, David Gilbert wrote:
I'm using #18 solid Copperweld wire from Davis RF for my 160m Inverted-L
antenna. It tarnished quickly to a dark brown and is virtually
invisible. I'm not even sure I could spot it up in the air if it didn't
have some dacron line holding it up to tell me where it is. The DC
resistance is negligible ... something like 0.05 ohms per meter, I think.
A 40 meter length at 0.05 ohm/meter is 2 ohms. On a vertical (which is
what an inverted L is), with feedpoint impedance of 35 ohms, 2 ohms is
about 6%, or a 0.3 dB loss? (huge assumptions here about uniform current
distribution, AC resistance = DC resistance, etc.)
It's amazingly strong, too.
73,
Dave AB7E
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