"Toni" wrote in message
...
En Toni va escriure en Wed, 24 Mar 2004 08:15:16 +0100:

En Tam/WB2TT va escriure en Tue, 23 Mar 2004 20:08:18 -0500:

Jack,
You may have a misconception about impedance here. Making the antenna
resonant is not going to make it 50 Ohms. Extrapolating your numbers, it
looks like resonance would be at around 6.9 MHz, and give you an
impedance
of something like 12 + j0. Might be a good match to a 1:4 (not 4:1)
balun,
but you would have to see what happens on the other bands.

Tam/WB2TT

Just a silly thought: If he made it resonant and had, indeed, 12
ohms, couldn't he make it into a folded dipole giving 12x4=48
ohms and probably a better bandwidth? (Of course this is assuming
monoband operation)

EA3FYA - Toni

Oops,

Just read in a previous post he is using a fan dipole. Don't
think it is possible to use the folded dipole then.

EA3FYA - Toni

Toni,
I think you are right. Seems like the 40m folded dipole should be a short
circuit at 20. For a single dipole though, what you say makes sense (to me).

Tam/WB2TT