Radio broadcast .. (1922-30)

Record Details:

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How Far Have You Heard on One Tube? 64,660 is the Best Aggregate Mileage Record So Far. Notes on Tuning. What Others Have Done. The End of the Contest February 1st FEELING THE NATION'S PULSE By RUSSELL SHEEHY Mr. Sheehy, who has piled up an aggregate mileage of 63,860 of stations 1 50 to 2050 miles distant, literally has his fingers on the nation's pulse at his home in Newfields, New Hampshire. He listens-in on Dallas, Texas; New Orleans, La.; Tampa, Fla.; Denver, Colo.; Wichita, Kansas; Havana, Cuba; Ensenada, P. R.; Toronto and Montreal, Canada; Lincoln, Nebraska; Chicago, 111.; Kansas City, Mo., Louisville, Ky., and other stations too numerous to mention. He has reduced the operation of his set to a logical set of rules which should be of value to others in securing similar results. — THE EDITOR. USING the circuit shown in Figure i, I have been able to hear, from my home in New Hampshire, most of the Eastern, Southern, Western and Southwestern stations on a single tube. Most of them come in very clear and loud when conditions are not extremely bad, and it is generally possible for me to hear the entire programme from any one of the stations on the list appended. Many sets are capable of picking up one or two selections from these stations, but somehow or other they cannot be held. With the circuit I am employing, after once a station has been found, it may generally be held until you desire to tune in another. My entire outfit is home-made, including the variocoupler which is wound with 35 turns on the stator and 35 on the rotor. No switch points or taps are used. After experimenting with different values, I found these values suited my aerial, the series condenser being .001 mfds. in the aerial circuit. The only trouble I had with this circuit was in the paper condensers and I strongly advise the use of mica condensers and tubular leaks in the grid circuit. The .001 mfd. variable condenser across the phones and batteries may be substituted by a .002 mfd. fixed condenser or sometimes on near-by stations by a .005 mfd. fixed condenser. In the last instance, the signal strength is very materially increased. The entire circuit is quite simple of operation and most of the tuning is done with the condenser in the aerial circuit and the tickler con trol. A filament volt-meter or ammeter is a good addition, and after once finding the plate and filament voltages, this part of the tuning is almost eliminated from the routine. ' I operate my filament on 4.4 volts and very rarely have to change it. With most of the detector tubes I have tried, the best B battery voltage is 1 8. Of course, this has to be found by experimenting with your particular tube. I have found that two potentiometers are quite an asset when long distance signals are desired. In this connection, the variable condenser across the phones and batteries is also very helpful. The potentiometer with the slider grounded at the correct position of the tickler may cause the tube to oscillate, by moving it toward the negative side, and it is just before this point of oscillation that signals are clearest and loudest. The set is operating at its best when you find that moving the condenser either way produces no oscillation, but there is a sort of "purr" on each side of your signal. The simplest method for beginning the operation of this set is to set your tickler at about 10 and move the condenser until a signal is heard (this is taking it for granted that you are on the correct switch point for the broadcasting wavelengths if you are using a variocoupler with a tapped primary.) If you find a squeal on either side of your signal, loosen the tickler, that is, bring it back toward zero, moving it very slowly, however, and the distance you will have to move it depends on the strength of the signal. If it is quite loud, move