. The Bell System technical journal . 4 which is an outline elevation and planof the antenna and building at 463 West Street, New York City. For-tunately there are no buildings considerably higher than the antennawithin a distance of several wave lengths. At the receiving test stations both loop and vertical antenna wereused: but in most of the experiments a simple vertical antenna wasemployed. It was constructed of brass tubing, 30 feet long, andguyed in a vertical position. A galvanized iron pipe 12 feet longwas driven in the earth for a ground connection. The vertical re-ceiving antenna pro
. The Bell System technical journal . 4 which is an outline elevation and planof the antenna and building at 463 West Street, New York City. For-tunately there are no buildings considerably higher than the antennawithin a distance of several wave lengths. At the receiving test stations both loop and vertical antenna wereused: but in most of the experiments a simple vertical antenna wasemployed. It was constructed of brass tubing, 30 feet long, andguyed in a vertical position. A galvanized iron pipe 12 feet longwas driven in the earth for a ground connection. The vertical re-ceiving antenna projected through the roof of the test station building 150 BELL SYSTEM TECHNICAL JOURNAL at Riverhead, L. I., as shown in Fig. 5. The receiving antenna wasnot tuned but was connected to the radio receiver through fixedinductive coupling. The carrier power in the transmitting antenna normally remainsfairly constant, except for minor variations in voltage of the supplymains, and with a little care on the part of operating personnel, the. DD (ZD □ □ DO □□□□□□□□ O □ DD □□ DD DD □□□ DO □□□□!=]□□□□□ nnncuDG on □□□ DD □□□□□□□□□□ DDIZnCIlOD DD diciDcz] DDimiiiiaiiiianciiiiiiaciiDDnciinDI—11—I rn nn rn rn r-ii—i |—I (—1 i—i rn r—11—1 nn i—ii—I DuriuDm DO he DOl wpm uuHumuu UUMUl] uu uuuu uuDD nH nn nn nn nn Fig. 4—-Plan—elevation of the transmitting antenna antenna current can be kept within the limits of a 1 per cent, varia-tion, which is small compared with the signal fading usually ex-perienced. The stabilization of the frequency was of the greatest importancesince in some of the tests it was desired to beat or heterodyne thesignals down to audio frequencies and pass them through narrowband filters. To provide this stability engineers of the Bell TelephoneLaboratories arranged the 5-kw. transmitter at station 2XB to obtain STUDIES IN RADIO BROADCAST TRANSMISSION 151 its carrier frequency
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
