Indianapolis Times, Volume 36, Number 207, Indianapolis, Marion County, 8 January 1925 — Page 16

SUPERHET SETS SQUEAL, ASSERT THEIRACCUSERS Neutrodyne Receivers Also Are Guilty, Experts Contend. Two radio facts, already too well known, were strongly emphasized by the recent transatlantic tests, together with a quite obvious remedy. * Since radio-telephone broadcasting began there has been, a steadily i icreasing protest against squealing. The increase in the number 61 squealing sets has beeq Just as steaoy in spite of all that has been written and said. There has been a great amount of erroneous assumption that only the regenerative circuit could radiate squeals, with major emphasiis placed on the single circuit type of regenerative set. It was quite evident in the transatlantics that the only set which cannot be made to radiate squeals is the crystal set. An‘unknown number, doubtless thousands, of superheterodyne sets were attached to outside aerials during the test and their steadily oscillating tube, which is the basis of the circuit, was allowed to radiate a disturbance which blanketed the air for several blocks around. The writer knows of at least one five-tube tuned radio frequentcy set which is always tuned by the squeals and which is attached to a long and high otitside aerial Its ninety volts of plate battery make it a most beautiful radiator of disturbance. '

Neutrodynes Squeal, Too There are thousands of neutrodyne sets which have become unbalanced, or never were properly neutralized, and which are tuned by the squeal or are allowed to oscillate more or less all the time. Then there are the regenerative sets which are allowed, without any necessity whatever, to squeal and whistle. We have come to the obvious fact that if anything is done it must be something easy and inexpensive. The only alternative is a Government ban on any set which can be made to squeal. Such a ban would be a severe blow to radio telephone broadcasting, .perhaps a well nigh fatal one. , y It may be a hopeless task to seek to persuade radio set owners to use a simple remedy, or a group of them, applicable tc any type of set. But it is a worth while crusade because if the present situation continues drastic regulation seems certain. Radio frequency sets, in almost every instance, contain a potentiometer which can be so adjusted as to prevent oscillation, thus preventing squeals. No superheterodyne should be connected to an outside aerial, and even an inside aerial may disturb neighbors over a considerable area. Many Squeals Needless Any neutrodyne set which squeals is not a neutrodyne in operation, because if it is neutralized it will not squeal. Without proper neutralize tion, which means exact neutral iza

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tion, it is not utilizing the neutrodyne principal in full. No single circuit set in any form, or under any name, be it tickler feedback, Relnartz, ultraaudion, Oolpitts, or other type should be used anywhere except out on a farm at least five miles from any other radio set. Any coup.ed regenerative set can be operated without any squeals audible 200 feet from its aerial and act the same time "will pick all the DX that can be secured when it is squealing. It is only nec sary to keep down the plate voltage to 22%. or less, and to keep the tube at but below, the oscillating point. When the set is tuned across a carrier wave it should give a “swish" or a rushing sound, not a squeal or a wtistle. If the set user persists in forcing his detector tube, let him get a honeycomb coil, wind 100 turns on a cardboard tube, or get a variometer or coupler, together with a variable condenser, tube socket, rheostat and potentiometer and make one stage of tuned radio frequency, which will add somewhat to range, increase selectivity and cut off the squeal. Dot-Dash Course Broadcasting station KOB, of the New Mexico College of Agriculture, at State College, N. M., has begun a course in telegraphy for amateurs. Lectures and examinations are given by radio and test codes are sent out. 300 Before Microphone Three hundred voices in one ensemble took the air through station WHN, New York. They comprised the Oratorio Society of the New York Christian Science Institute.

THE INDIANAPOLIS TIMES

Use Mirror If you need a good light when repairing a broken connection in the dark corner of a set, use a flashlight and a piece of mirror to reflect the rays where you want them.

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Rubber Bushings Holes in the cabinet for ground, aerial and battery leads cm be dressed up by inserting hard rubber bushings like those used in the top of electric light sockets.

STATESMEN HOI GOLF EXPERTS Not One in Hundred C. J Play Near Par, • | People who have never seen statesmen play golf may take at full value the assertion that they do not make their scores public for fear that the impressioh created would be that a man who can give Colonel Bogey so close a shave devotes too much time to the sport. Those who have witnessed them swinging golf clubs know a great deal better, says the Baltimore Sun. The actual fact is that there is not one in a hundred of them who can play within gunshot of par. If their constituents could see them, so far from being incensed over their expertness, they would take them on ' at a wager and probably skin the life out of them. They constitute, by and large, the worst set of dubs to be found. They tear up the turf, delay the game, stall about on the putting greens, forgetting how many strokes they have played. They do everything, in fact, but swat the ball down the fairway. They slice, they heel, they pull, they schlaff— making themselves a generous nuisance. They arc not above suspicion that they sole their clubs in bunkers and tee up in the rough. The surprise about tbe average Senator’s or Congressmans. S ol£ game is that anybody who ever felt the shaft of a golf club could do j little execution with it. The unmitigated gall which prompts them to spread the fantastic tale that they are the “real gt>ods,” which follows this up with a lot of bunk about being afraid of the political effect if their real game became known, ought to be punctured. It to to laugh. It is the biggest canard of the season.