Radio Broadcast (May 1928-Apr 1929)

ATCH Jensen Every radio authority knows what Peter L. Jensen did in 1927 and 1928. His perfection of the dynamic speaker assured the qualities in a radio reproducer which the perfection in audio circuits demanded. His reproducers served as the pattern for the entire radio industry. And now watch Jensen in 1929 ! The new Jensen Auditorium Speaker has already been announced. It is designed to operate with all types of amplifiers from the smallest with one tube to the largest with push-pull stages employing type 250 tubes. And in sensitivity, in brilliance and separation of tones, in its ability to reproduce ire mendJ ous volume, this speaker is unmatched by any other reproducer ever made. Write today for literature and technical data. JENSEN RADIO MFG. COMPANY 338 N. Kedzie Ave., Chicago, III. 212 Ninth St., Oakland, Calif. 7^ °'t JENSEN PATENTS ALLOWED AND PENDING Also Licensed under Lektophone and, Magnavox Patents 70°° Letters from Readers (Continued from page 356) apparatus is doubled, due to the necessity of first writing the publication for the trade names of the parts required. B. Strutt Major, Johannesburg, South Africa. Short Wave Stations MANY radio listeners equipped with shortwave receivers are anxious to pick up the signals of experimental telephone stations operating on frequencies within the range of their set. In this connection Radio Broadcast has endeavored to prepare a schedule of short-wave transmissions, but it has been found that the hours of operation of these stations is varied from day to day. The list which is printed below contains as much accurate data as it is possible to publish at the present time. The principal stations of the world, which may be heard regularly in this country with a simple short-wave receiver, are listed in the order of their assigned wavelengths. Call Location Wave Letters Length pcll Kootwijk, Holland 18 .4 w2xad Schenectady 19.56 wowo Fort Wayne 22 8 w2xab New York 24 .0 w8 xk Pittsburgh 25.4 5sw Chelmsford, England 25 .5 cjrx Winnipeg, Canada 25 6 2fc Sydney, Australia 28.5 2me Sydney, Australia. . .< 28.5 w2xal New York 30.91 PCJJ Eindhoven, Holland 31.2 w2xaf Schenectady 31 . 48 jb Johannesburg, S. Africa 32 0 3lo Melbourne, Australia 32 . 0 w2xai Newark 43 0 WBZ Springfield 50.0 wlw Cincinnati 52 02 wtff Mt. Vernon, Va 56 .0 ajg Nauen, Germany 56 .7 w2xe Richmond Hill 58 5 GC Paris, France 60.0 3XL Bound Brook 60 .0 w9xu Council Bluffs 6106 kdka Pittsburgh 63.5 w6xab San Francisco 65 0 w2xba Newark 65 18 wbz Springfield 70.0 Mexican Short-Wave Stations The following is a new list of radio-telephone stations in Mexico which has just been received from Mr. L. Lujuan, Consul of Mexico. RADIO BROADCASTING STATIONS IN MEXICO* Owner Raul Azcarraga. Mexico, D. F. "El Buen Tono," Mexico, D. F. C stulo Llamas, Mazatlan, Sin. Pablo Langarica, Mexico, D. F. Roberto Reyes, Monterrey, N. L. F. Zorilla, Oaxaca, Oax. Partido Socialista del Sureste, Merida, Yuc. Efrain R. Gomez, Mexico, D. F. Miguel S. Castro, Mexico, D. F. Martinez y Zetina, Mexico, D. F. Secretaria de Educacion Publica, Mexico, D. F. *A11 stations are licensed to operate on wavelengths between 350 and 550 meters. EXPERIMENTAL MEXICAN RADIO STATIONS* Call Power letters Watts CYL 500 CYB 500 CYB 500 CYX 500 CYM 200 CYF 100 CYY 105 CYS 250 CYH 105 CYO 101 CZE 500 Owner Mon Constantino Tarnava, terrey, N. L. Rodolfo Krause, Tampico, Tamps. Liceo Fuente, Saltillo, Coah Call letters 24-a 26-b 23-a Power Watts 20 20 20 100 *Experimental stations are licensed to operate on wavelengths between 100 and 250 meters. "AERO-CALL" SHORTWAVE CONVERTER SHIELDED FILTERED Factory-Built, Ready to Plug Into Your Present Radio Set The Aero 1929 Converter is a compact factorybuilt short-wave adapter equipped with special short-wave coils. It is designed for both A. C. and D. C. sets. Operates perfectly on A. C. or D. C. sets without motorboating, by an auxiliary filter system control. It can be plugged into any regular radio set. This amazing radio instrument now makes it possible for you to reach 'round the world — England, Germany, Holland, Australia, Panama, Java and many foreign countries are some that are tuned in regularly on short-wave. Permits you to enjoy international programs and many others from coast-to-coast that your regular receiver cannot get. What a thrill it is to plug this into a tube socket on your regular set and instantly be in another world! No change or wiring required. AH complete, ready to operate, tubes and coils hidden, no apparatus in sight, except the neat, golden-brown, compact metal cabinet in crackle finish. Size, 9x5 %x2^ in. The only converter we know of that really works on all sets. Two models — A. C. and D. C. Write for Catalog and literature, or send $25.00 and name of your dealer. Model A. without tube, for A. C. sets Model D, without tube, for D. C. sets $25 At leading dealers' and jobbers? INCORPORATED \ INCOB PORATED 4611 E. Ravens wood Ave. CHICAGO, ILL. Dept. 239 v\e^ vV^L 0wv ,v ■ • ' AW*6 <■ jAvcS \ Oil** MAIL TODAY • march, 1929 page 358 •