[TowerTalk] 40m beam / interactions

[Tom Rauch]

> The 2 el Cushcraft does not have a resonance on 15m. This is probably
> due to the fact that it has loading coils. I have the 40-2cd just 6
> feet above a KT-34xa tribander.

That's correct!!!!

Once an antenna is loaded the first resonance above fundamental can be a
long way off from the third harmonic. It can even disappear.

The closer the system approaches a tuned circuit (by the addition of
loading), the less problematic odd harmonics are.

It would always be a good idea to check and be careful, because a loaded 40
meter antenna might hit some other band instead of 15 (like maybe 17M or ten
meters even).

73 Tom