Radio broadcast .. (1922-30)

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 IT IS now about two years since the first systematic measurement 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 comparing the observations of two listeners having no other evidence than that given by their ears. The next step in radio transmission investigations, after portable receiving apparatus had measured the signal strength in all directions from a fixed transmitting station, was to move the transmitting station itself to compare its performance under different conditions. It is probably true that to serve a large city and its suburbs, a transmitting station should not be in the city itself. If the transmitting station is in the middle of a group of steel buildings, practically all of its energy is absorbed in the immediate vicinity of the station and thus wasted. Much better service would probably be furnished to the city dwellers if the station was located in the country, possibly twenty miles or more away, in the open country where the absorption is comparatively small. Such a location must have good grounding facilities, and therefore actual trials of the location are always advisable before a station site is determined. Station WJAZ of Chicago and vicinity has been doing just this thing lately. Their 100 watt transmitter, mounted on a truck, has been operated in various locations around Chicago and now a compilation of the data obtained by variously placed receiving stations around Chicago will permit the logical selection of the most suitable location for a new broadcast station. A German Broadcast Station on a Mountain THERE are indications from Germany that radio is progressing there, even if not at the rapid pace it has assumed in our country. At Lake Kochelsee in Bavaria a station is being erected which, it is claimed, will be the most powerful in Europe. The antenna will extend along the side of a mountain from the summit to its base, where the station is being erected on the shore of the lake. This will give an antenna two miles long and of rather indefinite height as far as radiation efficiency is concerned. Following our lead in educational radio, a broadcast station in Berlin has started to radiate some university courses two evenings a week. While intended primarily as a help to those who attend the university, probably some data will be obtained as to the genera! appreciation of this type of broadcasting. Is Education by Radio Wanted? IN AMERICA, it seems likely that the demand for solid educational material is one which has to be cultivated. By far the vast majority of radio listeners regard the radio