Radio broadcast .. (1922-30)

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How to Eliminate Interference with a Home-Made Wave-Trap Complete Instructions for Building an Inductive Wave-Trap and Using It with Your Present Receiver to Cut Out Stations that Ordinarily Cause You Interference By A. J. HAYNES, Jr. Vice-President, Haynes-Griffin Radio Service, Inc. T H E increase in the number of broadcasting stations within the last year has created a condition of interference in many of the larger centers, such as New York and Chicago, which is becoming increasingly more troublesome. Owners of radio sets which are generally regarded as extremely selective are finding that near-by or very powerful stations are exercising a blanketing effect upon their receiving apparatus, so that it is next to impossible to hear other stations clearly and distinctly. Nothing is more irritating to the DX fan who may live within a few city blocks of a powerful broadcasting station than to spend several minutes trying to bring up a very weak station to the point of proper audibility, only to have his powerful neighbor break in and completely blanket his tuning adjustments. As a certain gentleman of color, who was attempting reception under such conditions, once declared, " Intuhference is de one thing we ain't got nothin' else but!" The radio enthusiast who is fortunate enough to live loo or so miles from the nearest broad-casting station is not much troubled by interference. At this distance, the natural selectivity of his receiving set is sufficient in itself to separate the various broadcasting stations, and his opportunity of making a selection for several stations is very much better than that of his less fortunate brother who may live in the same city with some powerful station. His opportunity for long distance reception is also considerably better than is that of the man located close to the broadcasting station, because he does not first have the problem of eliminating the local station, which, because of its proximity, comes in with such power as to preclude the possibility of critical tuning. Hence this article is written primarily for the radio user who is located close to one or more broadcasting stations. The fan who lives at a good distance from any station at all will not be interested particularly in securing an adjunct to his present receiving set that will help to eliminate interference. If the latter is unable to obtain fair selectivity, he should give thought to the improvement of his receiver itself, or if necessary, replace it with a better one. THE NEED FOR A WAVE-TRAP OROBABLY nowhere in the world is the 1 interference between broadcasting stations so acute as in New York City. At the present time, there are eight active broadcasting sta VARIABLE CONDENSER / ANTENNA ANY RECEIVING OUTSIDE WINDING / f INSIDE WINDING FIG. I Schematic diagram of the inductive wave-trap in circuit with the receiving set