Radio doings (Dec 1930-Jun1932)

January, L931 RADIO DOINGS Page Forty-one Western Electric 50 K.W. Transmitter (Continued from Page 21) vided in duplicate and are designed to give the proper frequency at about JO cent. The final adjustment is made by temperature control which gives a change of from 30 100 parts in a million per degree. As long as music and entertainment continue to hold a prominent place on broadcasting programs, fidelity of trans mission will probably remain the most sought-for characteristic, not only tor the radio transmitter itself, but for all of the apparatus units in the system. A very high standard of performance has now been attained in this respect. The overall frequency characteristic is substantially flat between ?0 and 10,000 cycles — the greatest departure being less than one DB — an amount that could not be detected in ordinary listening tests by a skilled musician. The attainment of such high standards for fidelity leaves little opportunity for pro gress and it is improbable that significant advances in this direction will be made in the near future. Accordingly fu ture developments will be toward the elimination of noise and other interference, which in the past has so seriously impaired the artistic effect of programs, except in the imme diate vicinity of the transmitting stations. The 50 K.W. transmitter will cover an area ten times greater than a 5 K.W. At a distance of one mile there is a field strength of 5 volts per meter. A study of 5 K.W. transmitters compared with JO K.W. sets indicated that the for mer costs about $40 per square mile per year whereas the latter costs only about $7 per square mile per year — a reduction of about six to one. A coverage radius (night) oi about 500 miles is secured from a 50 K.W. transmitter depending upon actual local conditions. The improvement of quality for distant listeners is the principal justification for the present movement toward higher power outputs. It has also resulted in increased emphasis on the maintenance of a high average degree of modulation, a development which is rapidly bringing about a very perceptible improvement in general broadcasting conditions Racon Horns and Units are covered by U. S. Patents Nos. 1507711, 1501032, 1577270, 73217, 73218, 1722448, 1711514, 1781489. No. 5325 for Theatre Use r Column slightly less than 10 feet, 28 inches. Bell 30x40 Weight, .'iii pounds. musical clearness speech. ng full, reprodi and .1 >men( RACON Public Address Horns for Every PurposeAre Superior in Tonal Quality. TRUMPET HORN RACON'S Newest Development The All Weather-Proof Horn Bell 22 inches round, length 40 inches. Equipped with cast aluminum ferrule and suspension ring. For Public Address and all Outdoor use. This horn has been perfected after years of exhaustive research in Racon Laboratories. Will withstand all weather conditions. Requires no replacements or servicing after heavy rainstorms. Guaranteed for one year. Prices slightly higher than regular horns. Let Us Mail You Our Latest Catalog RACON ELECTRIC CO., Inc. Specialists in Acoustic Chambers Factories: 18-24 Washington Place, New York Slough, Bucks, England, and 3 Mutual St.. Canada The New Unit ml sliL-lith Baby Electro Dynamic Horn Unit List Price. $35.00 RADIO SOUND -TELEVISION Taught by Experts on Modem Apparatus >iaii coupon (or Further information Day and Evening Classes I Radio institute of California J o 921 W. 6th St., Los Angeles. Calif. | Please send me Radio and Sound Information. Radio Institute of California i N Address 921 W. Sixth St., Los Angeles VAndike 9343 | Clty and stat, ^