Vilas County news. [volume] (Eagle River, Vilas County, Wis.) 1896-1927, 1922-11-15

Is often used as n cOunterpolse and
connection Is made with II by means
Of a number OF copper plates or an
tnterconnected network OF wires. sunk
into the ground at various places with
On the area underneath the antenna.
These buried conductors should have
q 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 90 the art Of
shOrt-wave radio reception. Due 10 Its
characteristics. IL was used az Ar
drossan. Scotland. last December,
when - amateurs succeeded In bridg-
ing tie Atlantic with radio.
The Beverage antenna Is adapted 10
che reception OF signals on a single
Predetermined wave length. IL con-
Elsts OF one wire supported on 10 TO
I2-foot posts. this wire having a
length OF either one or two even wave
lengths. II designed for 2O0-meter
reception. the wire VIII be either $500
or 100 feet long.
Unlike the customary form OF an
tenna. this wire IS grounded at both
ends. At the far end. away from the
receiver. Il is grounded through a non
inductIve resistance OF from go 10 400
ohms. and NJ the receiving end through
a variable lnductance. In the case OF
the receiver used at Ardrossan. I'VE
stages Of radio frequency amplifica-
tion. a regeneratlve detector and two
stages Of audio frequency amplihea-
zion were used.
AS stated above. the Beverage an
tenna is designed for reception Of
single wave length. depending on the
lsngth OF the antenna wire. III other
wave lengths are TO be received, the
length Of the wire must be changed.
N has been found that the signal
strength using LOO feet OF wire. II
feet above the ground. Is approximate
~ the samesss would be heard with
slngfe vertical antenna wire. 100 feet
IN height. However. the Beverage an
Jenna is highly directional. and on ac-
count OF this fact. interference from
directions other than those from which
one wishes 20 receive Is reduced to
minimum. Also. due 10 the short dis
lance from the ground. static and at
noSpherlc disturbances are almost
eliminated.
In general. II may be said that the
Beverage antenna Is extremely well
adapted for the long distance recep-
ton Of signals from a given station
whose transmitting wave length Is
known.
Often by erecting an elaborate an
tenna system. the amateur does not
yet as good results as would be OBJ
tanned from q simple. well-located one.
The function OF an antenna Is 20 cut
the electromagnetic and electro-static
components Of the held radlated by
the trnnsmitter. and have Induced In
~ an elc~tro-motlve force which viii
cause a current 10 fiow In the antenna
circuit.
The capacity and inductance Of the
receiving antenna plus a small amount
OF Jumped inductance In the station 20
furnish n drop 10 operate the recelv-
ing set directly or q magnetic held 10
transfer energy 20 q second oscillat-
ing circuit. should he equal 20 the nat
ural period Of the received wave
Roughly. the nasural period OF single
wire snfenna Is 10 times the length
Of the antenna proper. plus the lead
A. wNNNa natural 90 Nha
TEN should be. as stated above. just
slightly less than the wave length on
which rs,eption 10 desired. BY actual