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RADIO AGE— "THE MAGAZINE OF THE HOUR"
13
Electric Light Wires as Auxiliary to Radio
THE B battery heretofore so essential to every radiophonereceiving set for maintaining the plate potential will no longer be needed when an arrangement made by the Bureau of Standards becomes generally practicable. The new development makes direct connection to the electric light socket possible. B y special modes of connection, the lighting wire may also be used as an antenna.
The warning given some weeks ago when this method of reception was suggested i n connect ion with the work of Maj. Gen. Squier is repeated : Novices should not attempt any meddling with lighting c i r cuits, hoping to avoid the erection of an antenna or eliminating the storage b a t tery. The new development is p r a c t i c able only with the proper plug equipment and some knowledge of the principles involved.
The receiving set cons i s t s essentially of an amplifier with minor auxiliary parts. This is described in a paper which has been prepared by the Bureau of Standards. A few details of the amplifier, which utilizes 60-cycle c u r
rent supply for both filaments and plates of the electron tubes, are as follows : This amplifier has three radio-frequency stages and two audio-frequency stages, and uses a crystal detector. The 60-cycle current when used in an ordinary amplifier circuit introduces a strong 60-cycle
During the war experiments proved that it is possible to use trees
antennae jar wireless receiving outfits. These two Atlantic coast
trees a chance to speak. Press Illustrating Service
note which offers serious interference. This has been practically eliminated by balancing resistances, grid condensers and special grid leaks of comparatively low resistance, telephone transformer in the output circuit and crystal detector, instead of electron tube detector.
In the final form of the amplifier there is only a slight residual hum which is not objectionable. The amplification obtained with a. c. supply was as good as that obtained with the same amplifier used with d. c. supply. The complete unit is light, compact and portable. For the reception of damped waves, the amplifier as constructed operated most satisfactorily for wave lengths from 200 to 750 meters. This range was determined by the working range of the radiof r e q u e n ncy t r a nsformers used. By usi n g suitable radio -frequency transformers it is expected that the amplifier will be efifective for the reception of damped waves and undamped waves as long as 10,000 meters. For the recept i o n of undamped waves a separate h e t e r o dyne should be employed, the paper says.
instead of the usual boys are giving the Photo