Cecil Moore wrote:
J. McLaughlin wrote:
After investigating a large set of traveling wave antennas (not
Beverage) I think that the smallest amount of power dissipated in the
terminating resistance was about 2 db.
Just modeled the subject antenna as well as I can. Without the
termination resistors, the antenna has a gain of +6 dBi on 3.8
MHz. With the termination resistors, according to EZNEC, the
gain drops to -10 dBi, a difference of 16 dB.
--
73, Cecil http://www.qsl.net/w5dxp
The antenna described in this thread has been utilized by the military
for simple, easy to erect and fairly inexpensive field use.
I don't think that you will get any argument from anyone that a
resistance terminated antenna is not as efficient as a tuned dipole. The
benefit one receives from using a resistance terminated antenna is the
lack of having to use an antenna tuner (another misnomer) when operating
off resonance. I, personally, use a B&W folded resistance terminated
antenna. This antenna is far from efficient but I can make great changes
in operating frequency with out having to worry about matching the final
circuit to the antenna.
I would like to have a tuned dipole for each band/subband but have
neither the room nor the desire to do so.
Now if you go to the receiver and look at the signal strength meter,
s-meter, you will see that 16db is only about 1 to 1 1/2 s units. In
that a receiver can differentiate a signal down to a very small value
the loss is of only academic interest, except to the purists.
Dave WD9BDZ