terminate a Beverage
on hcdx list, October 1999
Martin, USA: Does anyone know if the only reason to terminate
a beverage is to kill the signal off the other end? In other words,
are there are other advantages to having a beverage terminated?
The main reason for terminating a beverage antenna is to reduce
the signal from the receiver end, which isn't always easy, but
one way or another the lobes from this end will be reduced.
At the same time the front lobe(s) will be narrowed, and you will
get a "peaking" lobe(s) towards the area you have erected the
But theory and practice doesn't always follow each other, ground
conditions can vary from day to day, season to season; which can
be related with height, and the thickness of the wire.
But my two golden rules are:
1. The thicker wire is the better, and if you want to listen to
a area/continent, terminate the far end; but try with different
values - 470-560 ohms will fit fine, under most conditions.
2. A good grounding base, both at the far end, and at the balun/transformer
With these two things fulfilled, you have a real good start for
USA: Both here in Iowa and previously in Michigan, I have
used unterminated beverages.
In both cases it was for one reason. My beverages had to point
north (or actually slightly to the northwest) but I wanted to
receive signals from the south from Latin America.
Unterminated beverages allowed me to do that and worked quite
well. Grounding and static charges were not an issue, as at the
receiver end, my beverages were connected to a 10:1 balun which
Mäntylä, Finland: Terminating the other end of the
Beverage makes it unidirectional. But this is not the only advantage.
Another effect of the resistor is that it makes the receiving
angle of the antenna lower. This effect is found both at the main
lobe and at the secondary back lobe.
This simply reduces interference of regional stations and strenghtens
long-distance signals. The reason is that long-distance- signals
need more ionospheric hops than regional signals.
Here is Scandinavia it means that most European interference comes
from stations with one ionospheric hop while Trans-Atlantic signals
& Far East stations need 3-4 ionospheric hops. In practice interfering
European signals come to Scandinavia in 10-30 degrees angle while
Trans-Atlantic & Far East signals arrive in 3-8 degrees angle.
Because of this I wouldn't call long antennas without resistors
as Beverage. The resistor is the soul of the Beverage - without
it the antenna is a long-wire antenna.