On Tue, 04 May 2004 21:15:40 -0000, Larry W4CSC
wrote:

Gary Schafer wrote in
:

On Tue, 04 May 2004 15:08:08 -0000, Larry W4CSC
wrote:

Your feed point resistance may be 6 ohms but about 5.8 to 5.9 ohms of
that are coil resistance. The radiation resistance of the 15 foot whip
on 3.5 mhz is in the order of .1 ohm.

So about 97% of your power is going up in heat in the coils. Only a
couple percent of the power is making it to the antenna to be
radiated.
Of 650 watts only around 20 watts makes it to the antenna.

A full quarter wave length vertical has a radiation and feed point
resistance of around 36 ohms. Much easier to get power into than a .1
ohm 15 foot antenna.

Oh, don't forget to add in all the ground loss resistance too. Less
power to the antenna yet.

If you can get your feed point resistance down to around 1 ohm then
you will get about 10% of your power into the 15 foot antenna!

Regards
Gary


I've never met anyone so full of pure bull**** in my entire life as you,
Gary. It's simply incredible.

One hopes noone in their right mind will hire you as an engineer and suffer
the consequences.

I doubt 20 watts would make a signal 800 miles away at 20 over S9 in any
conditions, but we're, I'm sure, gonna hear more bull**** from you about it
in the near future.

Larry W4CSC

What class licenses and degrees do you hold, anyways? I've been a 1st
phone licensee since the 1960's, an avid ham operator since 1957 when I was
10 and graduated with honors from many military electronics schools run by
the US Navy because Vietnam's draft kinda got in the way of college in
1964.

Stop by some time and I'll let 20 watts burn your ass for you....(c;
I've never seen 20 watts produce a corona in air over 8" long....
How many kilovolts is that in air at sea level?


Heh heh, still haven't figured it out Larry?

Regards
Gary