LF: 500 kHz loop antenna ?

[Rik Strobbe <rik.strobbe@fys.kuleuven.be>]

Dear all,

did anyone try a loop antenna (for transmitting) on 500 kHz ?
As the radiation resistance of a small loop increases with the 4th 
power of the frequency a loop should be about 22 dB more efficient on 
500 kHz compared to 136 kHz.
A rather modest 100 m^2 loop should have a radiation resistance of 
about 0.0024 Ohm and thus require only 6.5 A antennacurrent to get 0.1 W ERP.
For a vertical the gain is "only" about 11 dB (plus whatever is 
gained from lower losses).
73, Rik  ON7YD


Disclaimer: http://www.kuleuven.be/cwis/email_disclaimer.htm