[Elecraft] K3 sensitivity below 40 meters

[Tony Estep]

On Tue, Nov 13, 2012 at 1:13 PM, Richard Fjeld <rpfjeld at embarqmail.com>wrote:

> ...even a good radio needs a resonant antenna.....
>
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It's true that reception is often better if the antenna is matched, but
this doesn't mean that the antenna has to be resonant. An antenna's
resonance or non-resonance does not determine its gain or directivity. It
only determines whether or not it presents a reactive load at its input
terminals. If an antenna does present a reactive load, a tuner can match it
so that the receiver sees the correct resistive impedance. You will hear a
lot more with a non-resonant curtain, rhombic or log-periodic aimed in the
right direction than you will with a resonant ground-plane. A half-hour
spent with EZNec looking at the gain and radiation patterns of long-wire
antennas of various lengths will dispel many misconceptions.

Tony KT0NY


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