Evening star., 1934-05-24
HIGHEST AERIAL
TOWERCOMPLETE
Structure Is Already in
Service at Station KOA
at Denver.

TINE highest self-supporting tow.
l er In the United States usec
as an aerial has just beer
l. completed for Radio Station
KOA of the General Electric
Co. at Denver. The tower is already
In partial service in connection with
the new 5o-kilowatt radio transmit
ter for the station, which will be for
mally dedicated some time in June.
The tower stands 470 feet high, and
Is a departure from the customary
type of radio antenna, where copper
wires were stretched in "clothesline
fashion between two towers. It will
act as vertical radiator of the radio
waves.
With the "clothesline" antenna, q
large part of the electrical energy re-
leased flows directly upward and is
lost in space, whereas with the new
type of radiator installed at KOA a
larger quantity of the broadcast waves
radiate parallel to the earth's surface
Those travelling upward do so at a
much wider angle than from the old
type antenna, and are reflected back
to the earth's surface by the ionized
stratosphere which blankets the earth.
AS result engineers expect a greater
signal strength to be produced at a
given distance.
Slender compared to others Of its
kind, the tower Is 35 feet square at
the base and tapers to two-foot
square at the top. 1t will withstand
q wind of 125 miles an hour, and its
50-ton weight bears down equally
when no wind is blowing on four
huge porcelain "eggs" which insulate
1t from the ground. Several miles
Of heavy copper rods are buried in
trenches extending from the tower
base in all directions. These rods,
like the spokes Of great wheel, form
the ground of the transmitter.
The transmitter itself, designed and
installed by the radio engineers of
General Electric, was built in Sche-
nectady and represents the most mod
ern achievements Of the radio art.
There are So tubes used, ranging in
size from the peanut" to giant tubes
as high as the average man and
which require the constant circulation
of cool water to prevent disintegra-
ton from generated heat.
ID Ado, with the cooperation of
N Chicago is to introduce to the
country tomorrow night the Sec
ond edition of the Worlds Fair with
a special broadcast originating in four
places.
The program, to be carried by Co.
1umbia. will come from Chicago, New
York, Detroit and Hollywood. 1t will
feature Warnings Pennsylvanians, Jan
CARRIER and Ted Weems' Orchestras,
the Detroit Symphony and the Chrys-
Ter Male Chorus in addition to a group
of screen artists from Hollywood.
Speakers will include Mayor Kelley Of
Chicago and Rufus S. Dawes, presi-
dent of the fair.
COLUMBIA has established a spe-
~ cial master control chamber in
New York to enable Paul White,
head of the networks public events
and special features department, to
direct the broadcast of the presiden-
tial review of the Fleet May 81.
White will give his instructions
from this point to the various an
nouncerS and observers through a
special short wave cueing transmitter.
ID EG NEWTON, popular VOL song
N ster, will become a network ar
tist tomorrow night when he
makes his debut on the American
Broadcasting Co. chain. Newton, who
accompanies himself on the piano,
has been broadcasting for about five
months over VOL.