Evening Star Newspaper, February 14, 1926, Page 36

30 THE WGY BIRTHDAY BIL TOLINKS STATIONS Record Number of Cities to Contribute to Same New Radio Announcer John Smith and His Radio BY FREDERICK C. RUSSELL tiroughout the world have followed John Smith in his daily nd have benefited thereby. that lis fellow fans should be amused and profit by his riences. Smith has a faculty for “finding out things” so it aeill pay radio devotces to follow Resistance Coupling. ed why the use of | of as audio SUNDAY STAR, WASHINGTON, Now he has taken up radio, in The Sunday Star each week. the proper capacity or resistance, the case may be, just as vou are iged to use the proper ratios when D. ¢, FEBRUARY "1 4, 1926—PART 1.~ “These three condensers are known as the isolating condensers,” I said. I place them here to isolate the grids from the plate potentials which are high, as I shall show you in a minute. They are just ordinary fixed con- densers of a capacity sufficient to by- pnsi« the potentials applied to the grid. ““The next step is to draw a line be- tween the plate of the detector tube and the plus side of the ‘B’ battery. You do not need to connect the line right at the plate. Halfway between the placed between the plate and the grid of the first amplitier tube will be about plate itself and the condenser we have | - placed between the grid and filament of each tube." Smith was impressed by the uni- formity of the hook-up and saw how easy It would be to buy the necessary parts at his favorite radio store. What worrled him, however, was how such an arrangement could resuit in amplification. “These resistances ough the voltage instead of i when using transformers, soned. to lower ase it as he rea- tly the case,” I replied. just the reverse of In the latter In the re- volt- transformer coupling. voltages are stepped in. Hear the Atwater Kent AT amplification | © sistance coupling arrangement ing transformers for this pur- ages are stepped down on each jump tortion Smith was | Tt you use any kind of trans- the method of | forer with no regard for the ratios of the audio|, luck could give you desired re- without trans is the same with the con-| surprised to find and resistances in this more ively simple. | Gmplified m of amplifylng the . 1 told him, can| gudio frequencies.” s from inespensive and| “ior fear of getting Smith confused | It results in 1 sketching on paper a resist- eption than | oupled unit. The input came mer coup m the detector in the usual man- the output going to the loud E . The three tubes for the thite different stages were drawn side by D in a set in which twe de and their filament circuits wired coupling would| to the plus and minus posts of the N Yol o ed, g\ battery in the usual way. : asked, “why | BoyE ko pling aisplaced| Smith Draws L'"""‘i , ) i . - | At this point I asked Smith to draw all of which ARD T. HUSING, s .‘um}ocling the plate of the de. ouncer on the staff - tube with the grid of the first who was transf amplifying tube, the first am ' plitying tube’s plate with the grid of | the ‘next, and so on. This w 1d show | eno coupled | fr right for our diagram. Next, draw a similar line between the plate of the first amplifier tube and the plus side of the ‘B’ battery. Finally, repeat the ith the output of the second The third tube we will let alone its output goes to the loud Litile @ Company 13th and Eye Strects N.W, Program. WaGY fourth succeeding tube drop caused by the rially aff & ance mi nd you know | that the ffic “officer of the plate current traffic. Whatever it | does is reflected in the plate circuit Qur installations insure year-vound radio reception Three Resistances. “In each of these lines we will place a resistance of abeut 1-10 meghom, which you should know by this time is the equivalent of 100,000 ohms. This [and magnified accordingly.’ d three fixed conden: and Next Week, No. € Fetlatunces. “The tinal < | Radio Sense. Piano and DE MOL Furniture Co. Twelfth and G Streets We— Handle, Iustall, Reconuncid ATWATER-KENT SETS Sole Representatives for the Steinway 1rt Keproducing t 20. In mplitication, can e three tubes and th ssistin ATWATER KENT SPECIALIST SMITH’S Battery and Radio Service 2119 18th St. N.W. phone Nort 4856 Phone North 9928 | rei 1t nce | tremely ¢ { you se they i nplicated. a4 three mplifying outtit D v neat “Of conrse, in build mplifving unit it is 1 | resistances, condensers Scheduled for Tonight's Concert. | n plate to grid in each instance. fd it| When he had finished I took the eraser and rubbed u break in each type of | one of the lines. At this point I drew ary to use| the two little parallel lines indicating ind grid leaks fixed condensers. resistance you would ind simple. ! : i ANNA CASE TO SING. 3 Ll Former Metropolitan Soprano Is © Minstrel iors former Metropolitan | o, is the artist s Burns Speaker Wurkrile Radio illard Storage Battery urgess Batteries Stanton Battery and Electric Service i be broadeast fron [ station W and 14 connected sta tions, including \WCAP, Miss Case is a native of Neshanic, | N.J. and an American trained sinzer. noted for her pronounced spirituality Last Summer she submitted hardest test of the music before the superc est musical center of ven Hail. Berlin, and scored the greatest triumph of her career. SN noved to New York Willard Service Station Changes Call Letters. vetteville, Arkansas 1 to KUOA. 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