Belt Valley times. [volume] (Armington, Mont.) 1894-1977, 1922-11-09

IS often used as a counterpoise and
connection is made with 1t by means
Of a number Of copper plates or an
i-nterconnected network of wires, sunk
into the ground at various places with
In the area underneath the antenna.
These buried conductors should have
n low resistance and should be put
deep enough so that the earth around
them Is permanently moist. See Fig
ure Is for a counterpoise of this type.
The Beverage antenna Is one of the
most recent additions to the art of
short-wave radio reception. Due to It's
characteristics. 1t was used at Ar
drossan. Scotland. last December,
when IS amateurs succeeded In bridg-
Ing the Atlantic with radio.
The Beverage antenna Is adapted to
the reception of signals on a single
predetermined wave length. 1t con-
slsts of one wire supported on 10 TO
12-foot posts, this wire having a
length Of either one or two even wave
lengths. II designed for 200-meter
reception. the wire will be either $500
or 1900 feet long.
Unlike the customary form Of a
tenna, this wire is grounded at both
ends. AT the far end, away from the
receiver, 1t is grounded through a nom
inductlve resistance of from $50 to 400
ohms. and at the receiving end through
a variable i~nductance. In the cas- OF
the receiver used at Ardrossan. five
stages Of radio frequency amplifica-
ton, a regenerative detector and two
stages of audio frequency amplihca-
ton were used.
AS stated above, the Beverage an
tenna Is designed for reception of a
single wave length, depending on the
length of the antenna wire. III other
wave lengths are to be received, the
length of the wire must be changed.
II has beer found that the signal
strength using LOO feet Of wire, IL
feet above the ground, Is approximate
w the same as would be heard with a
single vertical antenna wire. $50 feet
I'm height. However, the Beverage an
tenna Is highly directional. and on ac-
count of this fact, interference from
directions other than those from which
n wishes to receive is reduced to a
minimum Also, due to the short dis
lance from the ground. static and at
mospheric disturbances are almost
eliminated.
In general, 1t may be said that the
beverage antenna Is extremely well
adapted for the long distance recep-
flop Of signals from a given station
whose transmitting wave length is
often by erecting an elaborate an
system, the amateur does not
ret as good results as would be OBJ
tanned from a simple, welFlocated one.
The function of an antenna Is to cut
the electromagnetic and e~lectro-stauc
components Of the field radiated by |
the transmitter. and have induced In
n an electro-motive force which win
cause a current to flow In the antenna
The capacity and inductance of the
antenns plus q small amount
on Jumped Inductance In the station to
a drop to operate the receiv-
set directly or a magnetic neld TO
transfer energy TO a second oscillat-
circuit, should be equal to the nat
urpl period Of the received wave
Roughly. the natural period OF single
wire anfenns Is IL times the length
the anterns proper. plus the lead
In This natural OF the sntenna sys
should he. IN stated above, just
suxhtiy less than the wave length on
which reception Ia desired BY actual