Radio Broadcast - 1925, February - 113 Pages ... - VacuumTubeEra

The March of Radio 703
year the Philippines will
have their local broadcast
channels and occasionally
the listeners on these islands
will
undoubtedly pick up
messages from other lands.
Locating the Broadcast
Station
IS now about two years
since the first systematic
ITmeasurement of radio
signals was attempted and
carried out. Where evidence
about audibility and
interference is obtained
from untrained, observers
as was first
done, but little
progress in radio transmission
development is possible.
Real knowledge of radio
conditions can be obtained
only by making measurements
with instruments
which can actually be read.
It cannot be obtained bv
RADIO IN
RETAIL MERCHANDISING
The radio telegraph station wm at the New York store of John
\\ anamaker.
The Philadelphia and New York Stores carry on a great deal of
traffic which was formerly handled by telegraph, letter, and long distance
telephone. A five kilowatt arc is used, transmitting on a wavelength
of 1700 meters. The operator in the photograph is Douglas Smith
manager of the radio department at New York
selection of the most suitable comparing the observations of two listeners
tions around Chicago will permit the logical vast majority of radio listeners regard the radio
having no other evidence than that given by
location for a
new broadcast station.
their ears.
The next step in radio transmission investigations,
A German Broadcast Station on a
after portable receiving apparatus
Mountain
had measured the signal strength in all directions
from a fixed are indications from
transmitting station,
Germany
that
was
radio is
to move the transmitting station itself to
progressing there, even if
THERE
not at the
compare its performance under different conditions.
It is
rapid pace
it has assumed
in our
probably true that to serve a
country. At Lake Kochelsee in Bavaria
large city and its suburbs, a a station is
being erected which, it is claimed,
transmitting
will be the most
station should not be in the city itself. If the
powerful in Europe. The
transmitting station is in the middle of a antenna will extend along the side of a
group
of
mountain from the summit to its
steel buildings, practically all of
base, where
its energy
the station is
is absorbed in the immediate vicinity of the
being erected on the shore of the
lake. This
station and thus wasted. Much better service
would probably be furnished to the
give an antenna two miles
long and of rather indefinite height as far as
city
radiation
dwellers if the station was located in the
efficiency is concerned.
country, possibly twenty miles or more Following our lead in educational radio, a
away,
in the broadcast station in Berlin has started to
open country where the absorption is
radiate some
comparatively small. Such a location must
university courses two evenings
a week.
have
While intended
good grounding facilities, and therefore
primarily as a help
actual trials of the location are to those who attend the
always advisable
university, probably
some data will be obtained as
before
to the
a station site is determined.
genera!
Station WJAZ of Chicago and vicinity has
appreciation of this type of broadcasting.
been doing just this thing lately. Their 100
watt transmitter, mounted on a truck, has
Is Education by Radio Wanted
been operated in various locations around AMERICA, it seems likely that the demand
for solid educational material is one
obtained IN
Chicago and now a compilation of the data
by variously placed receiving sta-
which has to be cultivated. By far the