Radio Digest (Oct 1923-July 1924)

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RADIO DIGEST — Illustrated October 13, 1923 WSB OPENS FIRST FREE RADIO CLASS HUNDREDS OF FANS GET PRIMARY LESSONS Prepare Students for Emergencies in Catastrophes, or for Commercial Pursuits ATLANTA. Ga. — What was said to have been the first free public Radio school was : opened here recently by the Atlanta Journal, Station WSB, under the auspices of the Atlanta Radio club. Hundreds of Radiophans received primary instruction in the telegraphic code from Captain Walter Van Ostrand, federal Radio supervisor for this district. Inst in the lesson was heightened by an informal address as to the technical phases of Radio by Dr. Mcintosh Burns, president of the Radio club. Dots and dashes of the code were taught by e a buzzer operated by Van Ostrand and Burns. What the Radiophans learn in the school may be utilized them, it was said, in such emergencies ar, flood, fire or other catastrophe, or applied to commercial pursuits. Instruction afforded by the school includes the principles of transmission and reception and the building of transmitters and receivers. Classes are open to all. Pupils who miss one lesson may study it the day after by means of charts published in the Atlanta Journal. One of the features of the Radio school is the reception of conversation between various amateur stations in this city and vicinity. THE GUY WITH THE "CANS" ON Johnny Hines, well-known movie comedian, is that guy, and his partner in enjoying the air music is Hope Hampton, also of movie fame. The 'fact that telephone receivers are often spoken of as "cans" by commercial operators, prompted Johnny to "register" this picture FLEWELLING ANSWERS TO QUERIES — — — — ——^— By E. T. F1°"~'11;"c (Editor's Xote. — This department is written by Mr. Flewelling, the inventor of the famous super circuit. From the questions sent him each week care of Radio Digest, he picks the one considered most informative for all and answers it in this column.) * newelling with Loop Aerial (Submitted by J. G., Brooklyn, N. Y.) Question. I have built a Flewelling super with loop aerial submitted by A. D. Trumbull, Sidney, N. S., in the Digest, issue of July 7. When I turn the set to oscillating point it actually roars. By roaring, I mean I get that loud whistle which practically deafens my ears. Try how I will, I cannot get any broadcasting even though I come away down with the whistle. Should I make a change in condensers or add other parts to bring in the stations? Answer. Tour question really centers about the use of a variometer in the plate circuit. I personally have been ba <£ward about publishing diagrams showing such a combination for the following reason : If we use a tickler coil in a regenerative circuit, regeneration will be constant over a greater range of wave length than it would be were we to use a variometer. In the Flewelling circuit, we have, besides the regenerative action, the blocking and freeing of the tube and charging and discharging of the .006 condenser ; in other words, we have several more actions to take care of than in a plain regenerative circuit. If you will bear this in mind, and then remember that in tuning a regenerative circuit with a variometer, it is necessary when we change one control to balance all the others with it. This means that not one person in a hundred in tuning a variometer set will secure the maximum results from it, because, frankly speaking, they have not had enough experience with Radio to be able to properly balance one control with the other. I make no secret of it myself that with a set that is unfamiliar to me, I have to stop and think when I am tuning it, in order to get the maximum results. The above will show you that I am making a strong plea for the use of a regenerative circuit that uses a tickler coil in the plate circuit instead of a variometer, 6imply because it is not bo necessary to use much backward and forward balancing of the controls. Now, if you use a tickler coil on a set that is operating on a loop, you should use a coil for the grid circuit with which to tune in conjunction with the loop and thus give yourself an opportunity to secure the feedback coup Positive Radio Helps For Storage Battery Tubes Use Eveready Storage "A" Batteries. For Dry Cell Tubes Use Eveready Dry Cell Radio "A" Batteries. For all Vacuum Tubes Use Eveready «B" Batteries. EVEREADY Radio Batteries -they last longer ling that is necessary. This same question has been brought to us so many times that I feel it should be settled once and for all, as I have tried to do in this answer to your very kind question, and I hope that it will solve your troubles. Dentists Install Plant but Bar "Tooth Talks" New Orleans Syndicate Draws Line at "Painless Publicity" . NEW ORLEANS, LA. — Possibly the only broadcasting station owned by a dentist is that of the Union Dental Company, a New Orleans syndicate of tooth experts at 930 Canal street. Yes, they do not broadcast the silence of patients to advertise painless methods. The station is known as WTAF, and is not in the studio proper. It has no receiving station to beguile patients while under dental treatment, although that may be a later development. Programs consist entirely of high grade musical numbers, instrumental and vocal. While the dentists say they installed the station partly for advertisement, they are satisfied to use regular advertising channels, and seek merely to keep the programs up to the standard liked by genuine music lovers. No effort is made to seize an audience listening in and give them an instructive talk on acquiring, by means of better teeth, a "smile you love to see." Edmonton Plant on 2 Lengths EDMONTON, ALTA. — CJCA, the Radio broadcasting station of The Edmonton Journal, after its regular evening program which concludes at 9 o'clock. Mountain Standard Time, goes on the air on a different wave length to ascertain how signals are picked up at varying wave lengths. The regular wave length for CJCA is 450 meters. In its after-hours test it ranges all the way from 300 to 500 meters. B-T VERNIER TUNER ADOPTED— RECOMMENDED By 40 Largest Jobbers Within the last thirty days forty leading radio jobbers with credit ratings of $100,000 or more. seventeen of them with ratings of $1,000,000. have rushed the BremerTully Vernier Toner into their catalogs at the last moment. They recommend and catalog only the best radio equipment. Here's why they catalog B-T Vernier Tune.s: 1. It's the best Beinartz Tuner available. 2. It gives better control and maximum results on any single circuit regenerative, any of the ultra-audions or practically any of the reflex circuits, including Eazletine. 3. It's easy to change — ideal for *"tay-outs." Liberal discounts to jobbers and their dealers. Price $5.00 Postpaid. (But ask your dealer first.) Send for one today. Hook it tip and you'll understand. BREMER-TULLYMFG.CO. 532 South Canal Street, CHICAGO, P' Announcing Sockets The first of a series of parts designed by Mr. E. T. Flewelling, inventor of the "Flivver Circuit," which will assemble into a really capable set is the Flewelling Socket. This socket has terminals so designed that they practically assemble the set by mounting on tuner, rheostat and transformers direct. Standard Tube Socket $1.00. At your dealer or, until he is supplied, post paid upon receipt of price. w f i t Internal capacity has been whipped by so spacing a new type contact terminal that ideal conditions for radio frequency and reflex work are established. Further— good, clean contact against the base part of the tube terminals, with an easily inserted, firmly held tube, results in eliminating doubt as to good electrical contacts. E. T. Flewelling says: "Stray or internal capacity effects must be eliminated if tve are to secure maximum results." Watch this space in our advertisements for a series of helpful hints that will enable the Radiophan to build a better set than has heretofore been deemed possible. POSITIVE WIPING CONTACTSELF CLEANING wide spacingeliminates internal. :apacitv \ 2) RUELL MANUFACTURING POMPANY 2977 Cottage Grove Avenue CHICAGO