John, KK9A wrote:
Jim, are these fan dipoles? I am not understanding how a loading coils will
make a dipole work on two bands.
John KK9A
John and others:
I've made MANY wire antennas using coils. In simple terms (which I can
understand) what happens is, say an 80/40 dipole, the coils is made/wound with
enough turns so on 40 it has a high enough inductive reactance to block rf flow
any father. On 80 the coil acts as a plain load coil
W9INN used these properties on his wire antennas, even multi band (more than 2
bands). Yes bandwidth suffers on lower bands, but that's what they make antenna
"tuners" for.
I believe Butternut uses something similar on their HF6/9V, HF2V, and with the
160 kit for same.
Hope this helps.
73 and stay well
K9WN Jake
PS: NOT an antenna Guru. Much to old for heavy thoughts like this.
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