Radio mirror (Jan-Oct 1923)

June 10, ioj; RADIO DIGEST GLOBE PICK-UP PICTURES AUDIENCE Here is the control operator at WJY-WJZ with the new double pick-up microphone half open. All of the harsh, mechanical parts are enveloped and hidden by the unique globe arrangement. The globe is about eighteen inches in diameter and stands on a mahogany pedestal ■ The heart of WJY-WJZ. an oscillograph that shows the Radio waves as they leave the antenna. This allows corrections to regulate the modulation, etc. There is an actual "motion" picture of the wave on the revolving square mirror. Operator W. E. Tesch is observing Reputed the finest and most modern station, WJY-WJZ, atop the /^Eolian building. New York City, has probably the most novel pickup microphone in use today. This transmitter is shown above in the Classic studio. (There is also a Jazz studio.) At the left, the pick-up is shown doseup. The globe is really a sphere atlas and typifies the world, the invisible audience of Radio. The sensitive microphone is concealed within the thin gauze globe, painted to make it more realistic. The seas are deep green while the continents are tan. The unique arrangement is meant to aid many ether artists who have found it difficult to give their best in a soundproof studio with no visible listeners or applause Photos © K. & H. CFCN PLANT HELPS TO CALIBRATE SETS CANADIAN STATION SENDS ON VARIED WAVES Announcer Begins at 10:30 O'clock and Works on Rising Scale from 200 Meters By Jeffrey J. Sing-man CALGARY, ALTA. — With the object of aiding Radiophans to tune in more easily and expeditiously on broadcasting stations on their scheduled times and wavelengths, CFCX, . the broadcasting station of The W. W. Grant Radio, Ltd., at Calgary, is now conducting a service which will enable listeners-in to calibrate their receiving sets. One night a week the announcer at CFCX broadcasts on many different wave lengths, varying from 200 metres to 750 metres. The announcer commences at 10:30 o'clock, Mountain Standard time, and announces that CFCN is working on 200 metres, asking Radiophans who are on their air to note carefully just what position on their dials the pointers are in while signals are being received on this wave length. Great Aid to Listeners This is repeated every few minutes on rising wave lengths, and thus listenersin are able, to record on the dials of their receiving sets the various wave lengths. This tends to allow them to tune in more quickly when they know a certain station is broadcasting on a regulation wave length at a set hour. Many communications have been received by CFCN congratulating the management on this Radio service feature, which, judging by the number and tone of the communications received, popular and much appreciated. Phones Repaired Phone expert. Repaired phones for L". S. Navy. Can repair yours. Work guaranteed, rates reasonable. RADIALL ELEC. CO., Passaic, N. J. TWO SUPERSENSITIVE CIRCUITS (Both Copyrighted) My Highly Improved Reinartz brings In all important stations on both coasts and Mexican border, loud, clear and without distortion. We dance to music from Atlanta, received on one loud Baldwin unit. Build one of these wonderful sets from my blueprints and sreciflcations, price 50c. or with a perfect and complete double woond spiderweb coil, £3.00 by mail. No other windings used. Photo of my set on a glass panel with every order. This copyrighted circuit is the most successful of any Reinartz modification yet produced, and is imitated the most. Thousands are in use. My W. D. II Circuit is especially designed for use with the "Pickle" tube and brings out the full value of that little tube as no other circuit can. Stations 1000 miles away come in clearly on one tube. This set is small, complete, portable. For the man who wishes the highest efficiency, this is the set to build. Price of blueprint and specifications, 50c, or with complete and perfect windings, $3.00. Photo of set with every order. Either set Is easy to build, easy to operate. Everything clearly shown. Sets built from these plans will receive all broadcasting stations operating under the new laws. Their wave length range is from 140 to 670 meters. S. A. TWITCHELL 19ZS Western Ave. Minneapolis, Minn. FLEWELLING ANSWERS _____ By E. T. Flewelling _____ (Editor's Xote. — This department is written by Mr. Flewelling, the inventor of the famous super circuit. From the questions sent him each iceek care of Radio Digest, he picks the one considered most informative for all and answers it in this column.) Use of Loop Aerial (Submitted by A. W. H., Oelwein, Iowa.) Question. — In using the Flewelling Super on a loop should I connect the two ends of the loop to the binding post in the regular way or how should the loop be used? Answer. — The Flewelling Super picks up so much energy through its own wiring that a loop is not of very much use. If you use a short piece of wire, say 5 to 6 feet long and let it hang down from your set, you will secure as good results as you would with a good loop. Due to this habit of picking up its own energy, the Flewelling set robs a loop of any attempt that it might make to show directional effects as it does on, say, a Radio frequency set. The writer's own personal preference is to simply connect his set to the nearest radiator or water pipe and "go to it." Fully as good and generally better results are obtained in this way as upon a regular set with a good antenna. They Didn't Like the Paint and He Didn't Like Radio CHICAGO. — John P. McNamara painted the front steps of a house he owned at 1935 Taylor street recently. This did not please the tenants. Mr. and Mrs. Frank O'Connor, and to show their displeasure they walked down the newly painted steps and went out. When they returned they found the aerial of their Radio set torn down. Yesterday O'Connor obtained a warrant for McNamara charging disorderly conduct. The latest and most essential part of an efficient tube set Variable Resistance Leaks FOR PANEL MOUNTING Mounted on any panel in a few seconds — 2 screws serving as connections behind panel. Get stations you never heard before No pencil markings — assure unbroken range of 180 degrees. Clarifies signals — eliminates hissing. Complete with either .00023 or .0005 *1 f\f\ mfd. Mlcon Cond <p 1 «U\J Without Condenser 75c At your dealers— otherwise send purchase price and you will be supplied postpaid. ^KdS. Freshman \S!adio\ Condenser 106 Seventh Ave. New York WJAX INSTALLS NEW LIGHT-SIGNAL SYSTEM Announcer Can Communicate with Operator Without Speaking CLEVELAND, O. — In orr ir to insure the highest class of service from WJAX, the Union Trust Co. is planning to install a soundproof telephone booth inside its studio. While the program is going on the announcer will remain within the booth and so can communicate with the operator at all times over a private telephone, even though the operator is only in the next room. A system of signal lights will be installed for immediate communication between the announcer and the operator. These lights will be amber, green, red and white. When the announcer is ready to proceed with any number on the program, he will flash the amber light to the operator. That will mean. "I am ready." The operator will then flash a green light, which will mean, "The set is in operation." He will follow this with a red flash which will mean, "The microphone is ready — go ahead." The flash of a white light to either the announcer or the operator will mean, "Answer the telephone." In this way, even while the programs are going on, the announcer can talk to the operator, arrange for the next number on the program, and so forth, without in the least interfering with the actual broadcasting. The ringing of three silver chimes is the signal that announces programs from KFI. MAGXAVOX TYPE R3. Latest nationally advertised models in original sealed factory cartons. List $35. Special introductory offer $25. Radio Central, Dept. D, Abilene, Kansas. This Convict Eases His "Time " with Receivers Ohio Penitentiary Inmate Asks to Install His Set COLUMBUS, OHIO.— The most rabid Radiophan in this section has been found. He is Erwin F. Kumler, an inmate of the Ohio penitentiary serving from three to five years for automobile stealing. He was returned recently to Cleveland to testify at the trial of his alleged partner and was given permission to return to his cell with his Radio outfit. Kumler brought the set back from his trip and has installed it in the prison. The concert hours have been set from 6 to 7 P. M. and a loud speaker will be used. After these hours, Kumler will be allowed to continue his listening in with an individual headset. WE REPAIR YOUR VACUUM TUBES WD-II. WD-12, UV-199, UV-20I-A, C-301 -A 53.50 each UV-200, C-300. AP Detectors 2.75 each UV-201. C-301, AP Amplifiers 3.00 each DV-6, DV-6-A. $3.50: UV-202 4.00 each And Guarantee Them Equal to New QUICK SERVICE IncIude with your order re^ mittance to cover repair plus parcel postage for one pound per tube. If preferred, tubes will be returned C.O.D. repair charges. Abalene Radio ftSygrSTV. WILLARD RADIO COMPANY 291 Broadway New York City FLEWELLING CIRCUIT Every part complete, including drilled* panel and book of diagrams and instruo £1 i QC tions «pl 1 ."O REINARTZ CIRCUIT Every part complete, including drilled panel and book of diagrams and instruc tf>-i f\ qj Two-stago AudioFrequency Amplifier. Every part oomplete for above circuits at $11.00 3 13 23 43 13 23 43 Plate Plate Plato Plate Plate Plate Plate CONDENSERS Variable; value, $1.75 Variable; value, 3.50 ....$1.05 1.20 1.35 1.95 . . 3.75 , 4.00 4.25 Honeycomb Coils. 50 turns mounted 95 Honeycomb Coils, 75 turns mounted 1.00 Double Coil Mountings 2.45 Triple Coil Mountings 3.35 Reinartz Coils and Mounting 1.45 Jacks, Single Circuit; value, 65c, special at... .30 Double Circuit; value, 90c; special at 45 Multiple Point Inductance Switch with Knob and Dial (15 Switch Points) 1.45 Lightning Arresters, approved 90 Three-inch Dials, unbreakable, heat resisting composition, high finish; special 30 Two-inch Dials, same design, for rheostats and potentiometer; special at 25 Audio Frequency Transformer. Designed for use with W. D. II tubes: list, $4.50; price. . .$2.75 Variocoupler — Litz Wire Wound Secondary; value. $4.50; special 2.25 Ball Bearing Inductance Switch; value, 75c; special .30 V. T. Sockets, nickeled, brass, sleeve, composition base; value, $1.00; special at 40 Aluminum Loud Speaking Horn, nickel plated, highly polished; $8.00 list 3.75 Filament Rheostat. 6 ohm. Filament Rheostat. 20 ohm. 65 .80 Filament Rheostat. 50 ohm 90 With 2" Dial, l5o extra. Every article advertised above is guaranteed by the manufacturer and by us. Mail orders filled immediately. Transportation PREPAID on all orders of S5.00 or over east of the Mississippi River. All others Include postage.