At 30 Ohms you will need some matching network to cancel the reactive
portion out and rasie the radiation resistance of the antenna up to
that of 50 Ohms. I would not reccomend direct coax attachment even to
a 1/4 lambda ground plane antenna.

james


LMAO!


Ok, I just ran my 40 meter vertical on a simulator...

R=35.87 jX=.354

SWR=1.39.. now why do I need a matchbax?

But of course a matchbox wont raise the radiation resistance of my
antenna... will it?

Nor will it fix the basic mismatch.

30 ohms. Oh ****! I better put a 20 ohm resistor is series
with my radio of it's gonna' burn up!

1.5:1 SWR can be 25 or 100 ohms.
25 ohms will draw more current and drop more voltage. (more current X less voltage)
100 ohms will draw less current and drop the voltage less. (less current X more voltage)
50 ohms will draw the most amount of POWER from the source. (equal voltage X equal current = MAX
POWER TRANSFER)

James, you need to learn the power transfer theorum and how
little is actually lost by a 1.5:1 or less SWR. You gain
more with a resonant antenna, then a bit of impedance mismatch.