Radio broadcast .. (1922-30)

Record Details:

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In the R. B. Lab 239 any tuning combination. At wavelengths above 500 meters there was no apparent difference between the behavior of the two circuits, although in subsequent tests signals from spark transmitters on 600 meters were received with appreciably greater intensity when using the Variotransformer. In comparative reception tests, telephone signals were received from the New York stations (distances from 30 to 35 miles), from Chicago, Schenectady, and Buffalo. At the lower wavelengths, transmitted by WHN and WGY, signals were received with slightly greater intensity when using the Variotransiormer. At wavelengths above 400 meters there appeared to be little choice between the two transformers, as regards intensity and quality of the sounds produced. One difference between the behavior of the two circuits was noticed, however, in that the tendency of the circuit toward self-oscillation when using the T2 coupler depended largely upon the nature and location of the detector contact, whereas no oscillations whatever were produced when using the Variotransformer. Thus with the Variotransformer FIG. 3 The set made up by Radio Frequency Laboratories, Inc., showing the primary of the antenna coupling (See Fig. i, page 218) wound over the secondary. In the R. B. Lab's model (p. 237) the two windings are laid on side by side FIG. 4 Removing the top from the preserve jar at the shoulder the tuning adjustment was entirely independent of the adjustment of the detector for sensitivity, and this stability and relative ease of operation were not offset by any appreciable decrease in the relative signal strength. No quantitative measurements were made of the signal intensity obtained with the Variotransformer in this circuit. The programs broadcasted by stations WEAF and WJZ on the night of October i2th were received on this circuit and reproduced with good intensity in a highimpedance loud speaker. THE DAN I ELL CELL AS AN "A" BATTERY BY DR. E. BADE THE dry cell is not an ideal source of power for any closed-circuit work (i.e., where current is being consumed steadily) such as is encountered in the lighting of low-amperage filaments. The production of electric current in a battery, wet or dry, is accompanied by a chemical action within the cells, one of the elements being gradually destroyed as the current is generated. The best type of cell is that which permits an almost total destruction of the at