No surprise that a 160 dipole doesn't want to load on 80. Center fed dipoles
don't like even harmonics, but will work on odd harmonics. But most amateur HF
bands are even harmonics of each other, so except for 40/15 that doesn't help.
That's why my 40 meter dipole is off-center fed. If you feed at about one-third
of the way from one end toward the other, you'll get a consistent impedance on
the fundamental and even harmonics. So I use it on 40, 20, and 10, and all are
SWR less than 2. (Typically around 1.7 or better)
The catch is that the feedpoint impedance is about 150-200 ohms, so you need a
4:1 balun transformer at the feedpoint.
I'm not suggesting you modify your 160 dipole to off-center feed, but it's a
useful trick to know.
73,
Cathy
N5WVR
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