Radio broadcast .. (1922-30)

206 RADIO BROADCAST ADVERTISER SUPER-EMISSION are the most perfectly balanced tubes produced * X200A Super-Sensitive Power Detector Other Types 201 A 5 volt detector'amplifier X iii 5 power amplifier detector'amplifier power amplifier detector'amplifier 199 T, X 1 20 3 i a 1 2 and SPEED FULL WAVE GAS FILLED RECTIFIER FOR USE IN STANDARD "B" BATTERY ELIMINATORS A FEW FRANCHISES STILL OPEN FOR FIRST CLASS DISTRIBUTORS Cable Supply Company INC. Executive Offices 31 Union Square New York LETTERS FROM READERS Contributions from Readers on Various Subjects of Radio Interest—An Open Forum for All From the Sponsor of the Dill Bill PREPARATORY to its appearance in RADIO BROADCAST for November, galley proofs of Carl Dreher's article en- titled "A New Plan to Regulate Radio Broadcasting" were sent to Senator C. C. Dill. As all radio fans are well aware, the Dill bill for regulation of radio broadcast- ing passed the Senate without a record vote on the eve of the adjournment of Congress. Here is the Senator's letter sent after receipt of the galley proofs: Editor, RADIO BROADCAST, Doubleday, Page & Company, Garden City, New York. SIR: On my arrival here, I find your letter of recent date together with the galley proofs of an article for RADIO BROADCAST for November. I have read this article with much interest and have found it most interesting and instructive, but neither of the bills passed by the House and Senate provides for any such specific method of determining what broadcasting stations shall be allowed to use the air, although 1 think the language of the Senate Bill is wide enough to per- mit the Commission to lay down such a basis of deciding between numerous applicants. I think these suggestions are most excellent to be presented to the Commission . that will have charge of carrying out the bill when it is enacted into the law. It seems to me that the multiplicity of condi- tions and problems affecting the decision of the question of who shall broadcast in each com- munity, as so well presented in this article, make it all the more necessary to have a Commission that will give its entire time and attention to these problems, such as is provided by the Senate Bill, rather than an appellate body that will give only cursory attention to these questions as presented to it from time to time. I earnestly hope that the House and Senate conferees will be able to agree on satisfactory legislation early in the coming session. Thanking you for your letter and the informa- tion you sent, I am, Very truly yours, C. C. DILL. Washington, District of Columbia. The R. B. "Lab" Receiver THOSE who have already constructed the R. B. "Lab" Receiver, together with the many would-be builders, will be interested in this letter telling of the experi- ences of one who has already experimented for several weeks with a home-constructed receiver of this type. Editor, RADIO BROADCAST, Doubleday, Page & Company, Garden City, New York. SIR: I have been working with your R. B. "Lab" circuit for several weeks now and, as you have asked for reports, I will try and tell you of my experiences with this receiver. I have every issue of RADIO BROADCAST for the last year and a half, and have tried nearly every circuit described therein, from the old original Roberts to the "Aristocrat," but my success with the new R. B. "Lab" circuit ex- ceeds that I have had with any of the others. I have had a very interesting time comparing other sets 1 have built with the "Lab" set. We are about three hundred miles from Examined and approved by RADIO BROADCAST -5 Chicago and it takes a very good set to bring in any station from that city during the daytime, but I can get KYW on the loud speaker with the " Lab" circuit when the static is not too strong. I have not used the best of parts and the coils are all home made. 1 use a toroid of 145 turns, cut- ting off 48 turns for the primary, in the detector circuit. Using a solenoid low loss space-wound coil in the r. f. circuit, with a secondary of 50 turns and a primary of 12 turns, got even better results than with a toroid coil. 1 did not have any trouble in getting perfect neutralization so did not resort to the use of the tuned trap you speak of. The tone is all that could be desired, and the volume equals that of any five- or six-tube set. 1 use a 2:1 transformer in the first stage with one of 35:1 in the last stage. My opinion is that you have the best four-tube receiver yet presented to the public. Very truly yours, E. H. BREWER. Belmond, Iowa. From a DX Lion A/TR. MOSKOVITA calls himself a *»* DX fan in his letter below. With all due respects, many in the swim of radio matters would preferably dub him a hound, of the species DX. Yet we prefer to give him the title of DX lion, for it is doubtful whether many can offer proof of reception of so many distant stations a? he can: Editor, RADIO BROADCAST, Doubleday, Page & Company, Garden City, New York. SIR: After reading a letter in the October RADIO BROADCAST about Mr. Harding Gow, of East Sound, Washington, picking up station 3 LO, Melbourne, Australia, I thought ! would write to you about my DX reception. I am a verit- able DX fan, having tuned-in practically every high-powered station in the United States, and many of low power. Of these latter, especially would 1 like to mention the reception of CFCQ, Vancouver, British Columbia, a station of only five watts or so. Last winter 1 used to tune-in this station about four times a week, and this I have had confirmed. In fact, all stations have been verified, both American and foreign. I have a log book that looks like a Webster's dictionary. Whenever I tune-in a -station, I jot down the items being rendered, together with the exact time, and also make note of the dial settings. My radio is the greatest pleasure I get out of life, and the greatest satisfaction is to tune-in some distant foreign station and have it con- firmed. One of the biggest secrets of successful DX reception is patience—and plenty of it too. Many times I will wrestle with an elusive carrier for two hours or more, but I never give up until I have clearly heard a song or some other selec- tion whereby I may have my reception confirmed. At the present time (the second week in Octo- ber), the Australian stations are coming in with good loud speaker volume. I get 4 QG, Brisbane, 3 LO, Melbourne, 2 BL, Sydney, and 5 CL, Ade- laide. These stations all employ 5000 watts input, I believe. They are heard best at about 3 A. M. Pacific Standard Time. The Japanese stations are also coming in well. The Tokyo station, JOAK, is the most consistent, while JOCK, Nagoya, and JOBK, also come in with good 'strength. The Australian stations have excellent programs, composed mostly of classical music, and very little jazz. They are strong for community singing, and there is hardly a night (or, rather, morning) that one or other of