Radio Broadcast - 1923, August - 86 Pages, 8.5 ... - VacuumTubeEra

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330 Radio Broadcasthappens that its filament isoperated above or heard by the writer in Portland, Oregon include:below normal temperature. This adjustmentcan only be determined by experiment and STATIONLOCATIONAIR LINEvaries from time to time. As both the radioMILESand audio amplifier banks are connected to one KLZDenver, Colo.1035KSD St. Louis, Mo.1810plate voltage buss, their plate potentialisKFAFDenver, Colo.1035the same and appears to be best at about WDAP75 volts. The Chicago, i860detector plate voltage is a WCX 111.Detroit, Mich.2100WOCDavenport, I7IOvariable factor, but gives best results at about WSBla.Atlanta, Ga.227024 volts, when amplifier tubes are used throughout.A grid bias of from i| to 3 volts onWBAPFort Worth, Tex.|680WDAFKansastheCity Star1575WHAZaudio-frequency tubes Rensselaer, Troy, N. Y.2550prevents distortion at CHCFWinnipegI3'5that point as do also the i-megohm grid leaksUSING A LOOPconnected across the output of the audioamplifyingtransformers. As it is essential for IT is desired to use a loop, the tuning opera-consists simply of varying the secondarybest telephone reception to operate the receiver IFtionwithout local oscillation, the stabilizer is adjusteduntil this condition is obtained. The the signal is at a maximum, always keepingcondenser and the direction of the loop untiltuning now becomes nothing more than a the stabilizer down just below the oscillating.rough adjustment of the antenna circuit by Frequent voltage tests of both the A and B batteries,as well as of the filament potentials, arein conjunction with the primary condenser, essential to consistent and successful operation.means of the primary inductance tap switcha variation of coupling until a signal is heard, The " De Luxe" part of this radio receptionthen an adjustment of the secondary condenser would not be possible in auntil maximum signal is obtained. A cold garage orreductionof coupling is then advisable and slight for instance, so I have given my set an at-among a crowd of visitors in the living room,readjustments of the condensers until you have tractive and comfortable place to live in bythe signal as you want it. With a minimum of building a small room in the basement with acoupling, the receiver is most selective, and by painted linoleum floor and paneled walls androtating the secondary condenser it is possible ceilings of plaster board. Comfort is assuredto go rapidly from one station to another withoutinterference between them although they trolled) in one corner of the room, from theby an electric fireplace (thermostatically con-may be on only slightly different wavelengths. top of which appears the horn of the loudIn this respect the set is so selective that it is speaker. Reception of a sort is possible withpossible to tune out a local 5OO-watt station almost any kind of apparatus, but not the leaston 492 meters and bring in a 360 meter station enjoyable feature of it consists in being able toi ,100 miles away. Due to the radio-frequencysit in your own cozy room, listening to St.amplification there is but little loss in signal Louis, Los Angeles, or Calgary, as the notionstrength when used with a minimum of coup-happens to strike you, and knowing that youling-will not be troubled with interference ofSome of the distant broadcasting stations kind.
Teaching School from a BroadcastingStationA Successful Test by WJZ and the New York Board of EducationTBEdistinction, and itthe class in accountingHigh School, in New York City.the first group of studentsinstructed by radio is something of aseems to belong toBy LLOYD JACQUETof the HaarenAt a recent meeting of educators, attendedby officials of the Board of Education andmembers of the faculty, it was decided that theexperiment should first be carried out at theHaaren High School under the direction of Mr.R. Wesley Burnham, the principal, and Mr.Fred Siegel of the faculty. This was to be thefirstexperiment made to determine the feasibilityof conducting a course of instruction byradio in an educational institution in New Yorkor elsewhere.Accordingly, WJZ, the Westinghouse broadcastingstation, was chosen as the stationthrough which to conduct the experiment,sensitive receiving sets were installed in theschool room and at headquarters in the Boardof Education Building, through the courtesyof the Radio Corporation.Voice amplifiers were attached to the receiv-A CLASS IN ACCOUNTING AT THE HAAREN HIGH SCHOOL CONDUCTED BY RADIO
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270 Radio BroadcastPREPARING MESSAG
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276 Radio Broadcastis the first tim
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278 Radio BroadcastTHE BOOM IS ON I
Page 14 and 15: 280 Radio BroadcastWest Coast to Ha
Page 16 and 17: DR. MACMILLAN AT THE NEWLY INSTALLE
Page 18 and 19: 284 Radio BroadcastDONALD H. MIX, R
Page 20 and 21: 286 Radio BroadcastHiram Percy Maxi
Page 22 and 23: 288 Radio BroadcastIF AN ESKIMO BAB
Page 24 and 25: . Pioneer'. .*JUNK WORTH A MILLION!
Page 26 and 27: RadioBroadcastTHE RECEIVERAT 2 PMNo
Page 28 and 29: 294 Radio Broadcastsiderable intere
Page 30 and 31: 296 Radio Broadcastof course radio
Page 32 and 33: 298 Radio Broadcastafter trying sev
Page 34 and 35: 30ORadio Broadcastthan he might rea
Page 36 and 37: 3O2 Radio Broadcastcourt was broadc
Page 38 and 39: THE PRIZE-WINNING CONTRIBUTIONS ARE
Page 40 and 41: 306 Radio Broadcast2 transformers a
Page 42 and 43: 308 Radio Broadcastas short as poss
Page 44 and 45: 3io Radio Broadcastfind that the st
Page 46 and 47: 312 Radio BroadcastFROM SAILOR TO '
Page 48 and 49: The Grimes Circuit with OutdoorAnte
Page 50 and 51: Radio Angling and Fisherman's LuckT
Page 52 and 53: 3 i8 Radio BroadcastSOMETHING DOING
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Page 56 and 57: 322 Radio Broadcasthighest sensitiv
Page 58 and 59: 324 Radio BroadcastMR. CROSLEY BROA
Page 60 and 61: 326 Radio Broadcastinductance is va
Page 62 and 63: 328 Radio Broadcast^^V'VYVNA/VN/Y^^
Page 66 and 67: 332 Radio Broadcastin the classroom
Page 68 and 69: 334 Radio Broadcastaudience which i
Page 70 and 71: Sets for the Great OutdoorsBy A.HEN
Page 72 and 73: 338 Radio BroadcastTHE COLIN B. KEN
Page 74 and 75: R\DIOA PracticalSuper-Heterodynewit
Page 76 and 77: 342 Radio BroadcastDL 35
Page 78 and 79: etween344 Radio BroadcastREAR VIEW
Page 80 and 81: 346 Radio Broadcastcompletely. The
Page 82 and 83: 348 Radio Broadcastchanging the rhe
Page 84 and 85: The GridQUESTIONS AND ANSWERSThe Gr
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Radio Broadcast - 1923, August - 86 Pages, 8.5 ... - VacuumTubeEra

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