Posted by
Jim Brown-10 on
Aug 13, 2017; 5:10pm
URL: http://elecraft.85.s1.nabble.com/Is-it-my-KX3-antenna-or-is-it-lousy-band-condx-tp7633243p7633346.html
On 8/13/2017 9:09 AM, Walter Underwood wrote:
> The 16 foot wire on the ground is a radial “system”. One radial is a lot better than none, but you could use more. The length isn’t especially important
Right.
> because it is capacitively coupled to the ground.
It's also inductively coupled. BUT -- that's NOT how or why radials
work. AND a connection or coupling to earth does NOT make a transmitting
antenna work better. That's because the earth is a big resistor, so it
burns any power fed into it, whether with a direct connection or by
capacitive or inductive coupling. In other words, it WASTES transmitter
power.
> Ground resistance swamps any resonance.
Yes, but as noted above, not in a good way. :) There's a folded dipole
antenna made with a big resistor in the middle of it, the effect of
which is to "broadband" it by "swamping" the resonance, AND to burn half
of the transmitter power. In other words, the transmitter puts power
into the antenna, but half of it is wasted in that resistor.
73, Jim K9YC
______________________________________________________________
Elecraft mailing list
Home:
http://mailman.qth.net/mailman/listinfo/elecraftHelp:
http://mailman.qth.net/mmfaq.htmPost: mailto:
[hidden email]
This list hosted by:
http://www.qsl.netPlease help support this email list:
http://www.qsl.net/donate.htmlMessage delivered to
[hidden email]