Radio broadcast .. (1922-30)

RADIO BROADCAST ADVERTISER wnaem The Country's Foremost Radio Engineers Have Acclaimed METRflLIQN SLT STRAIGHT LINK TUNING Here at last is the final condenser — acclaimed by both amateurs and experts as the ONLY condenser embodying new and vitally important improvements over old type condensers — solving forever, the tuning evils of the past. Makes any set a itftf set — in 15 minutes SEPARATES ALL STATIONS ON ALL WAVE LENGTHS METRALIGN SLT is the only condenser combining Straight Line Capacity, Straight Line Wave Length and Straight Line Frequency, eliminating the faults and retaining the ad' vantages of each type — the result is a perfect tuning unit METRALIGN SLT spreads stations so evenly over the dial that all stations on all wave lengths can be quickly and easily tuned in or out and Jccurately logged, FREE We have prepared a most comprehensive booklet on tuning. It is written in simple language and tells all you want to know about condense's. Write for a copy to-day. General Instrument Corp. LETTERS FROM READERS Contributions from Readers on Various Subjects of Radio Interest — An Open Forum for All Broadcasting Stations in Argentina HERE is a list of broadcasting stations now operating in Argentina, which we print — as far as our America-resident readers are concerned — rather as a record than an exhortation to be "up and doing," so to speak. Editor, RADIO BROADCAST, Douhleday, Page & Company, Garden City, New York. SIR: Herewith a list of broadcasting stations now in operation in Argentina. This list makes obsolete yours which appeared in the February RADIO BROADCAST. LOCATION Buenos Aires Buenos Aires Buenos Aires Buenos Aires Buenos Aires Buenos Aires Buenos Aires Buenos Aires Buenos Aires Buenos Aires Buenos Aires San Fernando La Plata Santa Fe Rosario Rosa Ho Rosario Rio Cuarto Cordoba Cordoba Villa Maria Cordoba Mendoza WAVELENGTH LOO 250 1.0Q 200.8 LOR 400 LOS 285.7 LOT 272.2 LOV 352.9 LOW 300 LOX 375 LOY 315.8 LOZ 333-3 B2 275*214.8 D} 23S.3 LOP 425 Fl 275 F2 270 F3 265 M 260 H5 275 H6 250 H7 320 KB 296.4 H9 381.1 LOU 380 POWER IN WATTS 500 IOOO 5000 IOOO [OOO IOOO 500 IOOO IOOO 100 100 IOOO 20 loo IOO too 100 250 100 500 There are also two small stations in Mendoza. hut I have no details to hand of these. Trusting this material may be of use to you in correcting your lists, Very truly yours, C. E. SMITH, La Calera, Argentina. That Spark Interference AN INQUIRY from RADIO BROADCAST to the Independent Wireless Telegraph Company concerning spark interference, brings the following self-explanatory letter. There are three sides to the question, those of listener, interference producer, and apparatus manufacturer. We have not investigated the latter but, judging from the letter herewith, it is apparent that the Independent should not be condemned without due consideration of the hardships under which they apparently labor. SIR: I am in receipt of your letter of the first instant advising that the general tendency in the operation of ship-shore service has heen to convert the transmitter to continuous-wave operation as rapidly as it was financially and technically feasible, and in which you called our attention to the fact that our station at Hast Hampton, Long Island, continues to use a spark transmitter \\ e .ire thoroughly in accord with the change over from spark transmitters to continuouswave transmitters, and we have spent a large sum of money in changing over same at our East Moriches (WSH) Station. We have also directed about 90 per cent, of our traffic via the continuous-wave station at Kast Moriches. Tested and approved by RADIO BROADCAST if Unfortunately at East Hampton we have heen unable to obtain a suitable continuous-wave transmitter for short waves at what we figure to be a reasonable price. In taking the matter up with the manufacturers, the price quoted us was considered excessive, in that, in addition to the usual purchase price, which we learned was greater than that charged to others, we were required to pay a 10 per cent, royalty on gross receipts for five years. In other words, after having made a payment in excess of the usual price for the apparatus, we still had to pay 10 per cent, of the gross receipts for five years. This would mean a loss in operation during some of the periods when traffic is light. The question of the price of the equipment has again been taken up with the manufacturers, and we hope to be able to reach some agreement. If a satisfactory arrangement can be made with the manufacturers, we plan to use the East Hampton Station as a purely receiving station and place all of the transmitting gear at East Moriches, operating same by remote control. \Ve fully appreciate and sympathize with the broadcast listeners who are more or less affected when the East Hampton transmitter is being operated, but unfortunately we are unable to clear this interference until a satisfactory arrangement can be made with the manufacturers of the short-wave continuous-wave apparatus. Very truly yours, C. J. PANNIU , Vice-President, Independent Wireless Telegraph Company. In Which We Permit a Gentle Pal on the Back /"* RACIOUS reader, you arc ,now deign^— ' ing to read the last column of text in the September RADIO BROADCAST. If you have enjoyed our program, won't you please drop us a line and . . . we'll, maybe we shall reconsider that paragraph under the"Help Wanted" in this morning's Times, for, after the above, we must assuredly qualify for that position open for man with ability to say the right thing at the right time, etc. Nevertheless, we must admit that we rather like receiving letters such as that printed below from Doctor Baet/, Californian. Editor, RADIO BROADCAST, Doubled. iv. I'age \ Company, Garden City, New York. SIR: Your June number of RADIO BROADCAST has just arrived on the Coast and is making a great hit with its Silver-Marshall-Six improvements The usual radio publication has done a great deal of harm by boosting a new circuit every month and dropping it "for better or worse" in favor of the next advertiser. I thank you very much for your recent letter of information concerning radio troubles. It is the first useful information I have been able to obiain. I had previously applied for information at the manufacturers and a number of radi:> maga/ines to which I subscribe. All previous answers were written by clerks who knew !<•'--. about radio than I do. Thanking you for your courtesy and help, Yours very truly, \\AI.TI.K (',. l',\i [/. M. H., Huntington Park, California.