Radio broadcast .. (1922-30)

Another Receiving Contest! Any Number of Tubes — Any Kind of Receiver The "How Far Have You Heard On One Tube?" Contest, which closed February ist, has been a great success. Th-e hundreds of reports, diagrams, questions, and suggestions which we have received indicate the keenest interest in long-distance receiving throughout the country. The final reports of this contest appear in RADIO BROADCAST this month. AND we take pleasure in announcing, owing to the enthusiastic response to this contest, A SECOND LONG-DISTANCE RECEIVING CONTEST, to determine who has done the best with ANY NUMBER OF TUBES AND ANY TYPE OF RECEIVER. The Four Prizes First Pri?e: DE FOREST D-? REFLEX LOOP. RECEIVER This receiver, described in RADIO BROADCAST for February (page 297), is the latest product of the De Forest Company: it makes three amplifying tubes and a crystal detector do the work of six tubes. The loop antenna aids in selectivity because of its directional properties. An ordinary antenna and ground may be used, however, if desired. Recently, a man in Brooklyn, N . Y . heard a broadcasting station in Seattle, Was})., with one of the sets. Second Prize: GREBE TUNED RADIO-FREQUENCY AMPLIFIER, TYPE "RORN" Illustrated on page 352, RADIO BROADCAST for February. This amplifier, which has a wavelength range of from 150 to 3000 meters, may be used with any form of home-made or bought receiver. It is the most recent development of a company widely known for the excellence in design and workmanship of its products. Third Pri^e: Choice of THREE OF THE NEW RADIOTRON UV-20I-A AMPLIFIER TUBES (6 volts, I of an ampere), or THREE AERIOTRON WD-u DRY CELL TUBES (i\ volts, \ of an ampere}. Fourth Pri^e: TIMMONS LOUD-SPEAKER UNIT This unit, which may be connected directly to the output of your amplifier, has a diaphragm adjustable for sounds of different intensities, and when used with two stages of amplification reproduces broadcasted programmes about as loud as the music from the average phonograph. Rules of the Contest 1 . You should list all broadcasting stations 150 or more miles away from the receiving point, which you have heard distinctly (announcement of location as well as of call letters.} 2. Measure distances accurately, and give aggregate mileage. (This is the sum of all the distances, each station counted once, but two or more stations in the same city being counted separately.} An aggregate mileage of less than 15,000 miles will not be considered. j. Manuscripts should include the following: description of set, directions or advice for constructing and operating it; any "wrinkles" or makeshifts which you have used to advantage; photograph of your apparatus; circuit diagram; in general, anything you have to tell that will make your story more interesting and helpful. Manuscripts should not be longer than 2000 words. Typewritten reports preferred. 4. Data should be arranged in three columns, under the headings: call letters, location, distance. 5. For material used, a liberal rate will be paid. 6. In judging contributions, the quality and interest of photographs, text, and drawings, and the originality and general effectiveness of the apparatus described, will have greater weight than the list of stations heard, although a long list of distant stations will distinctly help. 7. The Contest begins now and closes May ^ist, 1923. 8. Address :ReceivingContest, RADIOBROADCAST, Doubleday, Page&Co.,GardenCity, N. Y.