Evening Star Newspaper, May 12, 1922, Page 24

24 e, V How to Build a Radio Set No. 11—Radio Troubles. == 5= === BY WAYNR BHAFFER. \A common question coming from prospective biildera of radlo seta fei “How far shall I be able to hear with this set or with that_set?" This is & hard one to adswer defi- nitely, as many conditlona enter Into the matter. A recelving set which will work well In one location often will not function properly in another. For instance. n efreult was recoms- mended in a recent radlo publica- tlon as giving suparfor results to most “ive different persons constr necossary apparatus to put the circult into operation, Of tho five. ono found that he could sults worth men- 1 the mot to be but th n it { Tocation again brought . ation, ground , all have a dl- ni, on the Intensity ived tubes cause much trou- present thue productton turers on tubes is belng n tubes not up to the sugh., A person may the 'nsolder- not suitable it was inte tion in th for wh ed conne cause a phones rec head curren radio and for rior appa- the mar- iar with atus he he has g New Apparatus and Devices R WB}‘ Ralph Brown, Radio Engineer: been numer- Although there have civer o out the ses some rather radio re tors, itself is position ¢ of. Adj in- ment is qui there is w surface of the « little drum is r is found. sensitive feally fool- roviding a coil and a ng- v | s much a of the | ving to get signals | he tinds that the for purpose | will offen | | purchased materials which will not slve the desired satisfaction, and in many cases canuot afford to threw |anz ‘away. Tt should be borme in mind tbat as a zeneral rule good, serviceable apparatus will cost very little more In the first place, an surely not any more In the long run. 1f at all possible, If the constructor 1s not acqualnted with the various parts of the set, he should consult some one who he knows is famlllar with the apparatus. and get that per- | son's advise on the best materials | to choose. Of course, even then he | may be til-advised, but the chances lare fewer, Another thing, make a neat job of | setting up the apparatus. If you i radio set you will have many nothing will prejudice against putting in a set s to see a mess of parts ly- fng every which way and connected [up with a conglomeration of wiree | that the owner himself does not even | know where they go. It ls much | easier to “shoot trouble” on a set | when soinething goes wrong with it | 1€ it _ts set up neatly and compact- |1y, Messy wiring permits the poasi- | blitty of getting a high voltage cur- | rent” across the receiving tubes and burning them out. Some operators also find what Is own as “swinging.” That ls, the aals fade out and back in again, offen at frequent interv: Tn many cases this can be traced Lo the swing erial elthe the sending or the recetving end. The mitting station. though. gen- lias the werfal fastened secure- A the trouble will_be found at the recciving station. The | aerlal wires rubbing against a limb of @ tree or the lead-in touching the {aerial support will cause the signals to drop out entirely at times. This | will be found to be particularly bad ion a wet night. (Tomorrow, **Mi . and | person | sii tr erally Iy und most o % a Transmitte ons to switch con- have provided little ing out e er inductances. Two such are furnished, one with a [ wave length range of 150 to 400 | meters and the other with a range of {500 to 1,000 meters. The cartridges | may be inserted in the spring hold- [ers’ mounted upon the cabinet. In order to vary the wave length and | provide for closer tuning than could | be secured with the fixed Inductances, !a variable condenser is incorporated in the receiver. This condenser has I a mica dielectric instead of the usual air dielectric. The plates move away from and closer to each other, de- pending on which way the condenser knob is rotated. There are no mov- |:\h1c plates interleaving with station- | ary plates, and consequently there is no danger of having bent plates and hort eircuiting of the condenser. It will be noted that there are no switches whatever. There is some conservation of the small electrical energy because of this | The ¥ r cabinet is of hard | rubber composition, wh does not | warp,_a the dimensions are 6l:x | 41 s, By E.H.LEwWL INSTRUCTOR NEW YORK Y.M.C.A. RADIO ScCHOOL RECTIFICATION. 1t a device is placed in an alter- nating current circuit, which has very high re ince to the flow of current | in one direction. but.a comparatively low ri to current flow in the opposit changed from one which flows in two directions alternately to one which flows in but one direction periodically. The action can be compared to a valve a w in . al- es in device, it lly increase and de- Such a device is and can be used to ternating current to storage bat In the case of the radio circuit the device may be uged to y the very high fre- quen ations (alternating cur- rent). suit, =0 th: be'm sating direc though the one direction does periodic ase in stren ectif curr, through Special for Saturday P-B Blue Suits with a pair of fine white flannel trousers Special at $1.2.50 Four pieces at the price of three The Avenue at Ninth | i|* VACATION TRIPS BY SE! TO Round-Trip Fares Effective Meals and stateroom accommodations on| steamer included. Extra charges for pre ferred space. Through tickets to principal points. Full information on roquest. Pier 3, Pratt St. Tel. Plaza 4200 i BALTIMORE. direction, the current will be | | function. In this case, however, the rectifier used for storage battery | charging will not operate because it usually requires more current than | 1s to be had in the receiving circuit. | "1t has been found, however, that | certain minerals possess the property of electrical rectification and can be satisfactorily in receiving Galena, silicon and carbo- are examples of mineral Suppose that a piece of connected into a receiving | ¢stem in such a manner that t which flows in the system < | operated | eircui dum ifiers. wrrent of the i very hindered i 5 to flow in the oppo tion _from ground fo top of an- a. The oscillations are then rectified, and, instead of high fre- quency oscillations, we have high fre- quency pulses or spurts of direct cur- rent in the antenna system. [ DYER B or | S W P Exterior House Flat-Tone Wall Paints Old Dutch Enamel Floorlac Varnish-Stain te | PAIN T when your property needs it surpx:lsed how attractive you can make your home with a little paint, varnish or enamel. We have the right kind—for inside or outs3e use. Sherwin-Williams make finishes for every surface, including: Mar-Not Varnish for floors Scar-Not Furniture Varnish , /- THE EVENING STAR, WASHINGTON, D. Radio Ralf— HELLO-10-LO-LO MELLO! BY RADIO TODAY NAA—Naval Radio Station, Radlo, Va. 1030 a.m.—Meteorological report on 5,950 meters of aro transmitter. 12 noon and 10 p.m——Time signal, followed by weather report and ship pan.—-Naval press news. Wave length, 1,650 meters. NOF—Naval Air Station, Anacostia, D. C. (410 Meters). 8:30 to 8:45 p.m.—Wednesday and Frid Music. . WW ost Office Depnrtment (1,100 Meters). 10 a.m.—Weather repoft. 10:30 a.m.—Marketgram by radio- phone. 12:30 p.m., 2:15 p.m., 3:30 p. p.m.—Telegram marketgram on meters. ., 6 1960 WMU—Doubleday-Hill Electric Com- pany (340 Meters). 4:30 and 5:30 p.m.—Base ball scores and the following program: Solos, “Till Love Thee" (Mascheront (MacMur- rough) and “By the Waters of Min- " (Lieurance), by Miss Lelia | I jua y. he Kerry Dance.” piano (Molloy); “hild.” foxtrot (Price-Silver- hapsodie Hongrolse,” piano, ondino.” violln (Kreisler): io,” contralto (Jose Pa- 00-Hoo-Hoo,” foxtrot (Nel- son-Link-Lentz-Aranson); “Turkey in the Straw.” piano (Gvion): “Hungar- ian Dance,” piano (Brahms); *I Passed by Your Window." tenor (May “Spanish Dance” (Roh- “Concert Etude.” piano (Liszt): " foxtrot(Lange-Klapholz) i K iin Gin Ginny Shore” (Les lie Donaldson); faust Waltzes,” piano (Gounod). WJZ—Newark, N. J. (380 Moeters) Enstern Daylight-Saving Time— Deduct One Hour. IZvery hour, 11 am. to 6 p.m.—Mu- sical program. 11 am., 12 noon, 3 p.m. and 10.01 “Weather forecast. 5 p.n.—Shipping news. Man-in-the-Moon" e unday Call. 7:30 p.m.—"Brief History and Facts About the Hospital Work for Poor Children in New York Ci by Leeds Johnson, president of the board of t. John's Guild, New York. ‘Woman, the the Applecroft p.m stories Greatest experi- The Trend of Business by Richard D. Wyckoff, editor of the Magazine of Wall Street. 8 to 9:30 p.m.—Concert by the Ford- ham . University Orchestra, J. Lynch, director. KYW—Westinghouse, Chicago (360 Mcters—Central Daylight Saving Time—Same as Eastern Standard Time). a.m.—Opening market quota- tions, Chicago Board of Trade, every half hour until 1 p.m. 1:20 p.m—Closing market quota- tions. 5 pm—News and market re- 4:15 p.m.—News, market and stock reports. 0 ers, with Robert D. Taylor and Larry Schaetzlein, accompanists. A — Westinghouse, Pittsburgh Meters — Eastern Standard T Ty 0 p.m.—Music. usic. fusic. .m.—Music. redits,” H. dent Indiana Archibald Certified 7 pm Harris, n. presi ROTHERS, Inc | RETAIL AND WHOLESALE and also tell you ln‘w Paint (oil) Rexpar Exterior Varnish Porch and Deck Paint. p.m—News, final market and stock reports. S to p.m.—Popular _program, courtesy of Whitmark & Sons. | HELLO! HELLO! hello! Public Accountants, Indianapolls, Ind. “The Fall Vesgetable "W D. Benedict, extension representative | Allegheny ¢ | S pm selections by Bee- f man’s Orch WWJ—Detrolt News (360 Meters— Central Standard Time). §:30 p.m rge Becker, tenor. The Lullaby Lady. Estell ra, soprano. John basso. The Town Crier. Mrs. Ludo L. Zimmer, reader. _— ANTENNA RESISTANCE. (Radiation Resistanc In the case of a transmitting an- tenna_the object is to A very little Poslam spread over theirritated skin usually stops the,itchingand burning rightaway. With theirrita- tion gone, the skinat rest, the kealing medication in Poslam 1 is cften able to check the in- 1 flammation and clear away eczema, rashes, orsimilarskin- troubles in a few days. Poslam is 80 coacen- trated that o little goes a long way. i irmis PAINTS ) The cost of neglect Mrs. Eleanor Weeks of Mattoon, Wis., writes ““Enclosed are pictures of two houses built about the same time. One was painted every two or three years and still looks like new. The other has never had but one coat of paint —the outside boards have cracked and, rotted and it ap- pears to be 25 years older than theotherhouse. Itrentsforjust half the money!” Bring your Paint Problems here - and we will see that you get the right material for your job to use it. Don’t put it off. You will be Inside Floor Paint Automobile Enamels . Industrial Finishes Insecticides &2\ SHERWIN-WILLIAMS PRODUCTS | The public schools of Los Angeles have added radio to their curriculum and schoolboy enthusiasts are now preparing for a radlo display, in which the Iateat and most popular developments will be exhibited. tudent manufacturers working In preparation for the big event. create as | ‘0, FRIDAY, MAY' 12, 1922, {Copyright, 1922, by the MeClure N-w.-un-r Syndicate.) KNOW 8 TRYING TO GET ME! -HELL0-10! EIR WIRELESS REYSTONE Here are | therefore, want to use as much of | | possible. in order to transmit as far | the electrical energy in the antenna| as possible with & given amount of as we can to produce this desired energy in the antenna circuit. When result. We have eeen In_previous waves are created in the ether en-|considerations, however, that there lergy in the antenna circuit is used (13 an effective resistance introduced | up—that is, at least a portion of the |into the antenna circuit whenever | electrical the antenna isfany energy is used up. When this| much disturbance in the ether as energy In changed into wave energy. We want|cnergy is used to produce ether | the waves to have as much power|waves the effective resistance is and energy as possible, and called “radlation resistance,” since What the Genoa plan is, to save Europe from another “welter of blood” that may drag America in? What the business conditions are in every State in the Union? What, the Chinese are fighting about? What Americans are doing to capture the South American shipping trade from the British? What is back of the West Virginia trea- son trial? The facts about the present condition of agriculture, mining and cotton and . woolen manufacture in Russia? Why Japanese farm boys are leaving the farm? About the new electrical cotton-picker that displaces hand labor? Why a famine is predicted for next year? Whether you are eating too much salt? Who put the jinn in the radio bottle? How to get college lectures free by radio? : this "week’s DIGEST. Tis a . Markot | Distinction to Be a Reader of The Literary Digest FUNK & WAGNALLS COMPANY the energy put Into the waves Is|to be fundam | may occur. | that 1t is possible for a receiving an radiated to & distance, This I8 a de- sirable loss in the antenua circuit, Copyright, 1932, by The MeClars Newrpaper Syndicate. —By JACK WILSON. _— GosH, 1T MUST BE ITALY' -1 sMelL GARuc! cefved is too near thi tal wave length, reradiatio From this it may be sen: and, within certain Imits, due 1o|tenna teo be tew long or tuo large other considerations than trapsmit- tng range, the radlation resistance in made purposely as high as pos- sible. In order to do this the other sources of energy loss must be kept at & minimum. . | may be thought, off hand, that a ving antenna never radiates any energy in the form of ether wave This is not true, however. since u der certain conditions f{t -can made to reradiate energy receiv from passing waves. Reradiation, 15 not the object of & T nd when 1t takes an effective an- which is not at all tenna resistance, desirable. The fundamental wave length of natural frequency is that which is had without any coil or actual con- denser in serfes between the antenna and the ground connection. The ad- ditlon of efther increases the wave Jength and decrenses the frequeney of the system. If the wave length RATS IN THE CELLAR MICE IN THE PANTRY Cockroaches in the Kitchen What can be w dixngree- able than a home 1 pesta? Destroy them Stearns’ Electric Rat and Roach Paste, the standard extermina- tor for more than forty-three yenrx. Kills rats, mice, cockroaches, waterbugs or ants in = night. Does not blow nway like. powders; ready for From $2.00 Vacuum Tube Couplers, Variometers, Crystal, Detectors-Parts. 920 I Street N.W. DO YOU KNOW About the machine that keeps telephonic conversations secret? That, in Mr. Mencken’s opinion, Amer- ica is barbarous, ugly, narrow, sor- did, ignoble, unimaginative. and fit only for blockheads and hounders Why crowds block the streets of New York at Geraldine IFFarrar’s operatic farewell? What the coming doctrinal storm is that is threatening the churche Why so many farm babi healthy? That it is proposed to blue-pencil the ten commandments? Sergeant Yorl ture of 132 Germans? Who the original flapper What to do when an crazy’ What are the best new novels ‘The facts about our national indebted- ness? How to pronounce “ski, paratus,” “mezzanine,” “viscount”? BATTERIES "RADIO All Types, Including the RAY-O-VAC “B” WIRELESS Sockets, Condensers, Transformers, HINES AUTO SUPPLY CO. s own story of his cap- - s ” “data,” “ap- to $12.00 Vari- Galena- Franklin 2624 2 55 are & un- was? elephant goces “apache,” Read the answers to these and hundreds of other timely and pertinent questions as given in the illustrated news-articles in “Millions Read It Every Week.” May 13th Number on Sale To-day—At All News-dealers—10 Cents