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About The Omaha morning bee. (Omaha [Neb.]) 1922-1927 | View Entire Issue (Feb. 14, 1925)
psp- — Loop Aerial Is Now Popular Small and Compact, Sharp in Tuning; Easy to Disconnect. The use of the loop type of aerial Is gaining In popularity among radio fans. It Is small, compact, directional, and is sharp in tuning, making It effective In places where there Is much Interference. To get the utmost efficiency with this type of aerial It must be pointed In the direction of the station which you wi*h to listen to. For this rea son loop aerials are generally fitted with a swivel base to allow for free turning In any direction. A convenient method of accom plishing this Is to fit the end of the vertical loop support stick into an o^inary telephone plug, connecting 0ri4Re two ends of the winding to the two terminals of the plug. This fits into the jack and allows the loop to be rotated, yet still make contact with the receiver connections which are fastened to the jack prongs. I. The o'rdinary type of jack, designed to be ueed on panels with a thick ness up to one-quarter inch, is diffi cult to use through the lid of the cabinet, which Is generally a half inch thick. A type of Jack and plug, designed by MaJ. Herbert H. Frost, Is made especially for use with a loop and has a number of advantages over the ordinary type of plug and J-'ek for tble purpose. It can be used on the lid of the cabinet by simply drilling a single hole. A large nickel plated face plate fastens to the top of the lid covering up any damage that has been done In drilling through the aggMffed and braces the jack so that it is perfectly rigid, even when holding a heavy loop. Springs Far Apart. The springs on the jack are far apart so as to keep the capacity as low as possible. The terminals are fitted with screw connectors in place of soldering tips, so that flexible wire leads can easily be attached and disconnected. The plug is extra large and long, and the bottom end of the loop frame can be easily inserted and firmly held. The two terminals at the side are for connecting the two ends of the winding. The terminals go through the cover of the plug, making a low resistance connection. The use of a loop plug and jack combination Is very good where the loop must be removable. To discon nect, you Just pull out the plug. The Jack allows the loop to be rotated In any direction without breaking con tact or twisting up the connections. r \ RADIO ---)\ I’rng rum for February 14 (Courtesy of Radio Digest.) By Associated Press. WSB. Atlanta Journal (428.3): *. De Moss family ronf <*rt ; 10:45, Hired Help. Ed ami Grace McConnell. WE El, Boston (silent) WGR. Buffalo (319): 6, music. WON. Chicago Tribune (370 2): fi. or gan: H:30, ensemble, string quintet; R. classical; 10. orchestras. WMAQ. Chicago News (447 5): fi band; 8. orchestra; 8:30, photologue; 9, Chi cago theater. WLH, Chicago (344.fi): 7. lullaby; 7:20, barn dance, organ, harmony girls; 11:16, Senate theater. KV\V, Chicago (492): 7. concert; 8. vo cal: 9:05, talk: 9:35, classic; 12, carnival. WKRH. Chicago (870.2): 7, orchestra; ■^a nivtem- 9, guitarists, danca; 11, music, ^^P8(strlstst jdanologue*. „ _ WBCN, Southtown Economist (l««): 7, reader, vocal; 8. harmonica, string quin tet nlanlst. vocal. WLW, Cincinnati (422.1)4 8, concert, quintet, lafafone. WHK, Cleveland (273)} 8, Rainbow club. • WPAA. Dallas News (475.9): 8:30, pro gram; ll, recital. WOC. Davenport (488 8): 7, Sandman; 7:30. religious discussion; 9. orchestra, •ntertalnsrs. KOA, Denver (322.4): 10, orchestra. WW.T, Detroit (silent). WRAP. Forth Worth (sllsnt). KNX, Hollywood (337): 8:15. orchestra; 9:30, organ; 10, voyage to South Seas; 12, or'-hestra; 1. June Ptirsell. WHS, Jefferson City (silent). WDAF. Kansas City Star (365.8): 8, ■rhool of the Air; 11:45. Nlghthawks. wH R, Kanrns City (silent). KHJ. Los Angelea Times (404): 8, or chestra; 8’30. children; 9:45, talk; 10. valentine party; 12, orohsstra; 2, Lost Argf-ls of KHJ. _ , ,A WIf AS, Louisville Tlmss (299 8): 7:88, trio baritone. ... , WMC, Memphis Comrnerclsl Appeal (199 7): |:30, classical. . wcco. Minneapolis-fit. Paul (416 4)t « philosophies; H:l6, travel talk; 8:30. mafl ddln orchestra; 10, dunce. WJZ New York (454.3): 8. orchestra; 9 30. dance. . WIIN, New York (361.2): 6:30. orches tra; 7:30, dance; 10, entertainers; 10:30, "wNTC, New York (616): 8 86.. Chateau four; 7 30. quartet; 8:11. recital; 1:10, travel talk. „ . ,A KGO, Oakland (299 8): 6, concert; 10. string quartet, address; 12, dance, solo ists. WOAW, Omaha (526): 8, dramatic; 8:80 readings; 8:45. program; 9, musical; 11, Nightingales; 11:30, organ WFf. Philadelphia (395): 8, talk; 7, concert. _ .. WCAB, Pittsburgh (481 8) 1 1:30 Uncle rsybee; 6:4f», tnovle chat; 7, road talk, 40, musical. . __ KDKA. l’ltl*bur*h. <30l.l): CIO, T»l»n tMi, ,urprl„; #:«, Ulk; 7:40, l>»nd con aert Kriw. Portland Oro*onlan <4»4): 1*. hestra. PWX, Porto Rico <400): 740 ronoorl. ^ae- K 1*0, Han Francisco (429.5): 7:30, new " tie vs; JO, orchestra. ,, Ki-yx, Hoattle <840: 10, orchMlra; u. oencert; 12, dance. 1V<)Y, Hrfiene.lady, <479 4): 4:40. d«no», I?HZ, Hprlnirfleld <804 11: 0 18. htntory; €■30 trio, reader, violinist; 1:05, sqlos, Instrumental; 9:05. vo<a1. W milt, Stat»n island (172.3): 7. flute. Vo< si. KMI), Ht. Louis Post Dispatch (646.1 ): • < oncert . , _ WRi* Washington (468 6): 8. music; 7. Blbia talk, 7.80. concert; 8;10, announced, *.30. dance; 10.16, ergau. Builders of Radio Sets Should Have Hoyt's Wave Meter; Construction Is Easy By HIRSCH M. KAPLAN. Francis R. Hoyt, inventor and engineer of considerable note, whose testing equipment has been the sub ject of several articles appearing in this newspaper, recently remarked that “the two most valuable instru ments in the laboratory of the radio experimenter are, without question, the oscillator and the wave meter. Of these, the wave meter is the more im portant.” This week the wave meter em ployed by Mr. Hoyt for general utility purposes is being described in detail. The constructional features of cuit Is shown In either of the two schematic diagrams accompanying the actual wiring diagram of the completed wave meter. This combination of coil and con denser constitutes what is known as an oscillatfng circuit. By varying capacity of the condenser in this oscillating circuit, the natural fre quency of oscillation can be made to correspond to the frequency of an other oscillating circuit. When the wave meter is used as an Instrument for the comparison of frequencies, some sensitive indicat ing device is connected in series or three cord tip Jacks (these are shown both in the photograph and in the wiring diagram), which permit the headphones and crystal to be un ilaterally connected or bilaterally con nected at will. The use of cord tip Jacks avoids the capacity effect of the conventional Jack which is of the order of from 10 to 12 micro-micro farads. The double pole double throw switch permits a quick change from the standard condenser of the wave me ter to an unknown condenser under test. This unknown condenser should be connected with very short connect the colls do vary to a small degree, yet they are more uniform thaln Is general!^ believed: but since the ex act Inductance will have to be used for measurement purposes, they pro vide an excellent starting point. When the exact lnductaijce of the coll to be used for a given wave length range is determined, this in ductance should he marked in Ink on the Inside of the coil, and It should be laid aside for use in the wave me ter only. The following table gives the gen eral characteristics of coils of this type: under test as its operation will per mit; this will prevent any possible reaction of the wave meter on the circuit under test. To couple the wave meter to the set under test, the duo lateral inductance which is mounted at the extreme rear of the baseboard (shown in the photograph) should be placed in inductive relation to the coils of the receiver or transmitter. The variable condenser of a wave me ter is then rotated until a maximum response is registered in the phones. At the point of maximum response the wave meter is in resonance with the waves to be measured and the ^ testing panels. to right they a for measuring voltage panel, a biasing battery panel and the wavemeter. this wave meter are of particular value to the experimenter, art all of the parts can be obtained on •’ open market, thus eliminating home construction of the necessary accur ate but tricky inductance coils. A definition of the term wave meter might be summed up about as follows: A combination of apparatus by means of which the length of electromagnetic waves generated by so'me outside source may be meas i — — In shunt In the rlrruit, to register the current in the coll or the voltage across the condenser. In the ordi nary applications of the wav* meter this sensitive device takes the form of a pair of telephone receivers and a detector, a hot wire ammeter, a Neon tube, or a galvanometer and a thermo-couple. When the wave meter is used as a generator of waves, the Indicating device is ordinarily re placed by a buzzer and battery, which ing leads to the binding posts on the left in the photograph (shown also on the diagram.) The condenser used In the wpve meter is the General Radio .001 mfd. variable, geared vernier type (a plain dial, is shown In the photograph) which comes supplied with a dfal graduated both in degrees and In ca pacity values in micromlcrofarads. Mr. Hoyt uses a specially calibrated chart for the capacity valuations, but Approx W .TV !n meter* to which Approx, coil will tune with Mllhenriea G. K. .001 mf. con Type Inductance. denaer. Dl, 23 0 4 0 1*0- *75 PI, ;t f, .07 5 1 80- 515 PL, an .150 240- 730 |,p 75 .300 *30- 1.030 pi, jnn \6U0 4 50- 1.400 PI, 150 • 1.300 «*0- 2.200 pi, "00 2 300 9 t0- 2.850 PI, 230 4 500 1 S«»0- 4.OOP p|, 311 6 .00 1.350- 4.800 PI, 410 11.000 2.050- 6.300 PI, 5nu 20 OQ0 *.ii00- 8.500 pi, 600 40.000 4.000-12,000 PI, 75.1 65 000 6.000-15.000 PI, 1.000 100.000 6.200-151.000 length of the wave will be measured and the length of the wave will be indicated by the dial reading. The two methods of connecting the headphone*, unilaterally and bilater ally provide a means by which very accurate measurements can be made. With the unilateral connection the response in the phoneB will not be as great as it would be with the other arrangement, hut when the wave me te^- la so connected the resistances of -1 . ured, or a combination of apparatus which Is capable of emitting waves of a desired length when excited by some outside source. It is therefore a calibration instrument which may be used to measure the length of electro-magnetic waves, the In ductance of a coll, the capacity of a condenser, or the decrement of electro-magnetic waves. The operating principle of all wave meters is the same, and one general circuit diagram will cover any wave meter. This diagram would consist of a condenser Hcross tho terminals of whlah an Inductance coll of low resistance Is connected. Huch a clr WASHINGTON IS HEARD ON ISLE Washington, Feb. 13.—With e homemade elngle circuit regenerative receiving set with two stages of am plification, an operator at the naval receiving station In Wallupe, Just out side of Honolulu, has been receiving messages sent front the Bellevue Naval laboratory, Washington, 4.BOO miles. Those messages have been sent from Washington between 9 a. m. and 2 p. m. at Bight, transmuting on 71.6 meters. Bellevue transmitter Is used at night for the transmission of govern ment messages to lamdon, Balboa, Han Diego, und Han Francisco. It" markable results hiivp been seer ' and the schedule will now be broad ened so as to Include i.u.iuu... ,.,.u the Puget sound. The navy Is hoping to get a 30 meter set, which will do this work In tie day time. The night transmitter Is a 71-meter set. ( WOAW Program Jlatarday, February 14. 4 p. m : Dramatic hour, Davis flludlo of JCupmualon. 4-25 p m.: Program arranged by Halo mu W, H#*arlnf*n of Jaffaraon* la. 4:4f> p. in.: Dinner program, transmitted from Brand a la atom restaurant*. 7 so p. in. { Weekly addreaa tinder ana pipe* of the Omaha Chamber of Corn inarca. * p. m Randall'* Royal Fontanall* or rh«*tra *♦ Fontanilla. II p. m Frank W Mmlek, 1r.. and hi* (lnijitis Nly hi ln*'i |e«» at Ron I und Harden* II :iT» n in • Organ muilr, (rnnaniltted from World lhaaiar; Arthur ila>a, ui •aoisl* when in operation excite damped oscillations in the resonance circuit of the wave meter. Const ruction of Wave Meter. Four of Mr. Hoyt’s testing panole are shown in the illustration this week. In their order from left to right they arc: an Instrument for measuring the voltage amplification of radio frequency amplifiers, a bias Ing battery panel, n pickup and transfer panel and on the extreme right the wave meter. The complete wiring diagram for the wave meter Is furnished, and the two schematic diagrams show the method of connecting the headphones and crystal detector for either unilateral or bilateisl connection. The wsve meter la so constructed that an unknown coYidenser or an unknown Inductance may ha substi tuted for the known condenser or known Inductance, thus permitting arcurate measurements of inductance and capacitance. The wavs meter is equipped with recommends that the ejyjerlmenter use the (leneral Radio dial supplied with this condenser. The direct read ing capacity values are of great ns slstance for coll and condenser meas urements. Duolateral ’ colls are used for the Inductances, and bjr substituting smaller or larger coll* the wave length range can he made to conform to any desired minimum and max! mum. The duolateral coll Is particu larly suited for wave meter work In a utility wave meter. In this type of coll the distributed capacity for a given Inductance Is lower thnn In any other type of winding. The physical dimensions of the coll are admirable for an Instrument of this kind, It Is an easy coll to coupls to an extrane ous oscillating circuit and does not easily change Its Inductance with or dinary usage. Duolateral colls come In various sixes end sl| rolls of one size are sup posed to he of the earna Inductance. While this Is not exactly the case, DI# 1 250 125 000 7,000.21 000 m, 1 500 17 5 000 f,20" 25.00H DU 1.500 175 00* 5.200 25.900 It will b# seen from the shove that t hecoll-condenser combination as em ployed In this wave meter will give a wave length range from 130 meters to 25,000 meters. The colls have been shown In the table In the values or steps In which they are manfunctur ed. These stages Or steps provide a considerable overlap and tt la obvi ous that all of the colls are not re quired to cover a given range. For Instance, the DL 25 and 50 will tune from 130 meter* to “30 meter*. 3Vhen It Is desired to measure the wave length of a received or trans mitted wave, the wave meter should be as loosely coupled to the circuit the crystal and headphones sre not In the osrllatlng circuit, and the reso nance curve of the wave meter Is therefore very much sharper. It Is often desirable to use the bilateral arrangement to get the Initial adjust ment* and then change t* the unilat eral connection for final readings. Ground Load* Short. ]f possible, the ground lend should he kept up within a length of four to five feet. Lohg ground leads not only broaden the tuning of a set, but also add a resistance to the antenna tuning Inductance. Wherever possible the receiver ehould be. located as near the ground connection as space will permit. CltT Kim RESULTS trohr imhitlng. Ernrrona aa 7 * ** ton I a had by STElNlTK Thu boat ( VyaUl I m»d«forCry«UlH*U. Kll> uy itandird Mdir, R. A. Gourd, Jr., K.C., Mu., uyi: I got Da Mho. Chicago, Hrhnnartady. Pitta* —--^ hnkMddavtlfttid.'' H. lUnrman, Op "iy ****** wag litubf m Itadb dydo, III . ggjra: I hart heard atationa; *h** tha an naan mt Mid thlt la WDAf, moat diatant KDKA WSII WOAW — --kUI “•‘f'.'jHt.*.1’' .WOA> and WOY. 8fh.narta.ly K» ml." .lUi. ww'ImHVtTw.Counrl! Bluff., la., aaya: "1 ha KDKA Pitlabuvwh Thu n?tt Right*1^* «i"c»md night Iwot K PK A. F! Pittsburgh.” raaatrai |ffi, lgtiigi, HAr . aad Thouaanda of STEIN ITE uaara bar*. Jiii7:.fW*AhAb ■■ Vou rantdouM your own an. PA SPECIAL OFFER-1 r.. SI Ml liwld Mw MU. lid Mlw ltd Idd. 8TKINITB la nannllaary iwyktal. It', an «*V'»,8 “•» dlarovary. Opana upna*j>oa. r—-—-- <5 NlraF.Ma. IMRM.StdalliTrttMi.llti talutad. laaa Mat*,, tUap] O WfcT Mipt'.^.'a'LoK.'.V; •*» OUARANTU BSTl *'? ***..rW* T"* P*. IA yaar.rr.f.l.M If i« at. n.tV»pr..„i an.l I Fillducriptivlltaratoiroon rmjuaat «*«ra than pluaaad I wilt aand hark your money * *. ■» ■ without ana uuaatton That# two big Atrhioon STE11MITE LABORATORIES, „ o.in l*H ■ A TCI ISON, MUSAS | tjfeinifg LOW LOSS Interference Eliminator What Radio Users Hava Bean Looking For For those who hav# had Interference Troubles this new auxiliary tuning device will (rap out the un desired stations. ' Select Your Stations at Will The air is ao crowded with music and voice* that tb«* average «et fails to bring in the desired xta- |! tions properly. The Steinite Interference Eliminator shuts out local and other interference. You get one station at a time, whatever one you want, and can tune It In loud and clear. Improved results with tube or crystal. Try for yourself entirely at my risk the wonderful improvement thla in expensive little devicy will make in the rerrption of your set Sold on absolute guarantee of satisfaction 01 5 money hark and the greatest do|. ! lar's worth *v*r offered the radio | public. Improves result* on both • tvsta! and tube seta that use an indoor aerial, outdior aerial or light socket ; hut will not help a set using i loop antenna. Clears up reenptinn wonderfully and partially absorbs j stai. Mfira. IFamoua IJOO Ml. Stelalte | ( 1 Amaung Satisfaction tr ! Tub# Seta* fill Long Pittance ▼ * Money Back Crystal Seta. $6| Da l.uae Crystal yut th|§ interference eliminator on ,1 •*•*. complete with headphones. Vf,ur Brt mxu\ not» amating Improve aerial and • round. $10| I-Tube Set. mr*„t No tool* needed and but a mo $l«i 2 lobe Amplifier, $1S. I RFF. mPnt , time required to Install. Full descriptive literature on request lirecUnns with eoeh laetremeat till ply connect with nnd follow Instruction* Hfiuiies no additional lubes •»» I batteries. You must he pleased and delight'd or you get money hark promptly on your say so. 91 postpaid anywhere In 1.1. S. when cash accompanies order. | These two big Atchison banks will testify to my rel’ahllity : Fxrhange Na i ilojia! Bank. Atchison Savings Bank. Order todai a d»liai bill will d«». gl STEINITE LABORATORIES *“nVui World Entering New Radio Era; 15,000,000 Sets Now in Operation Washington, Feb, 13.—The world ha* entered Into the radio era, according to Dr. J. H. Dellinger, chief of the radio laboratory of the United States bureau of standards. Exhaustive studies of wireless com munication have been inaugurated by the government, looking to the im provenjent of broadcasting and recep tion by the public. The "circulation" of the broadcasting stations of the na tion run* into the millions—it is esti mated that there are more than 15. 000,000 receiving sets in operation. "Aaurvey of progress in radio re veals that this la the era of radio engineering," Dr. Dellinger said. "This statement does not refer to the Im portance or extent of radio engineer ing, but to the type of development now going on ih radio, as compared with that of past years. "Relatively speaking, radio has been crude heretofore, whereas the progress now being made is not merely em pirical, but Is more largely character lied by actual engineering develop ment. We have not so much the invention of devices now as the per fection of them. Engineering of radio has taken definite form, and is the tool by which further progress will be wrought." Included in the noteworthy devel opments of radio by which Dr. Del linger mentioned were marked exten sion of the available frequency range, great improvement in directive radio transmission, advances in the perfec tion of selective radio systems and en gineering development of line-radio, or carrier current communication. "Among radio devices and ap pliances," Dr. Dellinger continued, “there Is outstanding progres on radio beacons, on the use of radio for aircraft navigation, on direction finders and on radio vision. In the field of research and study we have Important progress in radio measure ments, in standardization of appa ratus, In the study and mitigation of the vagaries of wave propagation and atmospheric disturbances and in the wide reaches of the interference prob lem.” Among conspicuous achievements was mentioned that of the "conquest of the new domain of ultra-radio, or very high frequencies, the short wave lengths." Even the existence of the vast range of frequencies below 150 meters, according to Dr. Dellinger, hardly was suspected and "certainly was generally forgotten up until less than a year ago." "One curious reason for the subor dination of this range of frequencies has been the erroneous use of wave length in meters as an expression of radio frequencies," he explained. “Radio engineering actually deals with currents which have a certain frequency. The length of Vile wave a* it travels 'along in space can be calculated from the frequency, but it is a derived and artificial concept.” Dellinger said that frequencies up to 20,000 kilocycles have come into extensive use. Actual radio service* sra being conducted in this region by broadcasters, transoceanic communi cation companies, military services and amateurs. Even higher frequen cies have been used in experiments; "but," he added, "there is every like lihood that in the development of fre quencies above 20,000 kilocycles d! rectlve transmission will predominate and the problems will be of a dis tinctly different character. "So important are these high fre quencies that the third radio confer ence parceled out the high frequency territory among the various services, thus reaching a solution of a problem which only a year ago was regarded as Insoluble, that of finding more com munication channel*,'' the authority asserted. "Alternate frequency bonds, ap proximnteiy 10 per cent wide, were ■- ■ ■- ■■ n-- — ■■ — " — " assigned to the following different services: Land point-to-point, aircraft, ship, relay broadcasting, public serv ice, amateurs and mobile army. An Important principle was followed In this assignment—that is, each aervice was protected from possible harmonic interference from stations of the other services by placing the several fre quency bands of any given service of its own harmonics." Improvement in directive or beam transmission has been accomplished by using a number of transmitting antennas and so adjusting the phases of the current in each, in relation to their distances apart, that rein forcement of radiation is obtained in one direction and more or less neutralization of radiation in other directions. "An obvious advantage of beam transmission," Dr. Dellinger said, "is that much lower power is required than in ordinary radio transmission, since the transmitting power is all utilized in sending the waves in the desired direction instead of in all di rections." According to Dellinger, one of the principle means of overcoming inter ference between the transmissions from simultaneously operating radio stations is Increase of selectivity or narrowing of the band frequency which each station uses. “The various causes of interference divide into two great classes—natural and man made," Dellinger continued. "Progress is being made eteadily against both of these enemies. ,As to the natural interference, there will always be a certain residum of at mospheric disturbances and fading which will necessarily limit the dis tance from any broadcasting station at which reliable, satisfactory recep tion will be possible. "The various kinds of man-made interference, on the other hand, are curable and are of local character; it can be expected that more and more localities will be freed from the various types of this pest. "The battle against interference is being won, in spite of the enormous increase in the use of radio." Importance of Location. The signal strength of a radio set will be affected if the cabinet is on a table located near a steam radiator or other metal, or if the aerial lead is parallel to absorbing material. The difference is remarkable sometimes when the set is moved to another part of the too mor house. Poor battery connections cause con siderable Interference. A Remarkable Incident. Samuel Hail of Matlock, England, who has been deaf for 40 years, found he could hear after listening in on the radio. -SCeinite a u®® I l --—-1 Before You Buy a Radio Receiver Here we want you to examine carefully the make* we carry. Compare side by side all the type* of receivers on the market today. Hear them in actual operation. You may want ready portability—or a very low priced set —or a very high priced set. Whatever it is, we can suit your needs, for we carry all makes and models from the lowest priced to the highest. For a medium-priced set of unfailing excellence of re ception we unhesitatingly recommend— The FREID-EISEMAN NEUTRODYNE The Finest Radio Receiver In the World Four and Fiaa-Tuba 3ata. $169.80 and ap. Complata, imtallad ia homo. Aarial aotrn. EASY PA YMENTS A. HOSPE CO. i 1S13-1S DOUGLAS ST. —T-rn