[Elecraft] Antenna

[k6se@juno.com]

Stuart, K5KVH wrote:

"Of course, the Beverage receiving antenna is a wave antenna, and the
loss of galvanized distributes the needed terminating resistance
throughout the wire slowing the wave."
==========
Perhaps that explains why the termination resistance for my Beverages is
much less than others have found on theirs.  To determine the correct
termination resistance value, I applied about one watt of power at 1830
kHz to my 1100' Beverage and walked the wire with a field strength meter.
 With the correct value of resistance, the field strength along the
antenna had no peaks or nulls, however it did gradually get smaller due
to wire loss and radiation loss as I walked toward the terminated end. 
The correct value of resistor in my case was about 300 ohms (7' high
Beverage over desert soil).

The theory behind the improved F/B ratio for the galvanized steel
Beverage is that the signal from the reverse (unwanted) direction must
travel down the lossy wire twice to reach the receiver -- once toward the
terminated end, and then whatever signal is reflected from the
termination must travel down the wire again toward the receiver.  Signals
coming from the forward (desired) direction must travel down the lossy
wire only once.

73, de Earl, K6SE