On Jun 25, 3:28*pm, Owen Duffy wrote:
Hi Sal,

On Saturday, 25 June 2011 04:16:42 UTC+10, Sal M. Onella *wrote:
...

being the most promising, I think. *With the help of EZNEC (evaluation
version), I modeled a promising 20m dipole at 30'. It's almost exactly
75 ohms resistive at the freqs I want to use and I'm going to feed it
with RG-6, 0.7 dB/100 feet. My radio has an internal tuner to match
the 75-ohm cable, if I need it.

That sounds fine as far as it goes.

You might consider a 1:1 current balun, a W2DU style one should suit this application fine.


Owen

Thanks. I did have the current balun but failed to mention it. I had
25 Mix 43 beads, Coil Winding Specialist P/N SB-6873-43. I see now
(my after-the-fact research) that Mix 73 would have been more
effective at 20m. ("We get too soon old and too late smart.")

I have baluns on all my dipoles, two voltage baluns and two eight-turn
coax cable wound baluns on my home station and a spare eight-turn
balun in my travel box.

I have read that the W2DU balun should be repeated at intervals along
the feedline, some wavelength fraction, but I found no confirmation in
ten minutes of searching. Got anything on that?

"Sal"
(KD6VKW)