Evening star., 1924-11-30

yeloped for the Shenandoah proved
of such value that they are being
duplicated for fleet test with view
of possible adoption as standard re-
ceivers for all ships"
During the year the Navy installed
primary tube transmitters on Is bat
tleships and secondary tube sets for
commuuicat tion with observation air
craft. improving both types of COM
munication considerably, and reduc-
ing interference. Three battleships
and cruiser were equipped with
duplex systems enabling them to con-
duct simultaneous communication and
reception on four receivers and trans
mitters, speeding up traffic and elimi-
mating Interference. Another i'm
provement was the installation or
method of using the same antenna
for multiple operation on single
ship, decreasing the number of aerialS
previously necessary. submarine
radio equipment was improved to
give increased range.
New equipment for aircraft includ-
ed IL type SE-13S5 trausmitters. which
give reliable daylight range. New
types of ~ and 80 watt vacuum
tubes. increasing the efficiency of
transmitters from 80 to 90 per cent,
were developed at the radio labora-
tory. Another achievement was the
adoption of tubes for reception re-
quiring a filament potential of two
volts. which resulted in a saving of
Go per cent in weight of storage
batteries required in aircraft. Small
plate batteries weighing | pound and
ounces were substituted in place
of 5-pound batteries previously used
in airplanes.
The design of new high speed key
for the Army. set at Arlington.
makes the transmission of 100 words
per minute to Fort Benjamin Harri-
son possible. on the reception end.
a new high-speed automatic radio
telegraph recorder was developed.
making 100 word reception possible
even when static is very bad.
Naval radio engineers have prac-
tically completed work on high-speed
radio apparatus. for service at about
10 words per minute. This includes
setting up mechanical transmitting
and recording receiving sets at
Washington, San Francisco. San Die
go. Honolulu and Cavite. Recorders
and relays for this work in the Hon
olulu central station at Wailupe. are
being installed.
Four New Stations Licensed.
Broadcasting licenses were issued
to four new stations last week by
the Department of Commerce. At the
same time three stations were trans
ferred from class to class A. The
new stations follow:
kFRW-Cntted Churches of OIym-
pia. Olympia. Wash: 220 meters. 100
watts
WBBM-H. Leslie Atlass, Chicago,
ILL.,: 226 meters. 200 watts
"BGC-F'irst apti st Church,
lam h, Q
WCEE-Charles E. Erbstein, Villa
Road, near Elgin, ILL.,; $50 meters,
1000 watts.
The stations transferred from class
c to Glass A are: WEAP, Mobile, Ala:
WRAO, st. Louis, and WRK, Hamil-
ton, Ohio.
Foreign Radio News.
In Sweden the "Radiotjanst" has
been given concession by the gov
ernment for radio broadcasting dur
ing the next two years. Radio re-
cefving sets will be taxed - crowns,
the amount being split between the
telegraph company and the broad
casting organization. Loud speakers
are taxed extra when used in public
places or for Advertising Present
plans provide for stations in Stock
holm. Gothenburg, Malmo Sundsval
anu boue1, the HrSt and last of which
will be ready by the first of the
year
The Norwegian Telegraph Company
is also planning to broadcast, starting
in December. A company capitalized
at 10000 crowns will handle the
broadcasting with 1 Y XIV. sets Re-
ceiving Will be taxed at 10 crowns
per set, and, as there are supposed
to be 10000 amateurs in the country,
the income is practically assured.
German exports of radio apparatus
have grown considerably during the
past three years and for the first half
of 1924 totaled $50 metric tons, nine
tons of which came to the United
States. On the other hand, the United
States exported 496 tons in the same
period and sent only ! ton to Ger
many, where there is an embargo on
radio imports. Germany appears to
be our strongest competitor in radio
apparatus and her exports in the
past three years have more than
quadrupled American manufacturers
may have to speed up.