Radio broadcast .. (1922-30)

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714 RADIO BROADCAST ADVERTISER every reader of this magazine needs c. Static Redactor TRADE MARK Practically eliminates normal static — reduces excessive static to a minimum. Eliminates necessity of outside aerial with any set-— makes a squealing receiver absolutely non-reradiating — increases selectivity — improves tone quality. Elevates an inexpensive receiving set to the dignity and quality of a high-priced receiver. Enables a good set to bring in far-distant stations -with a full, clear, smooth tone not before dreamed possible. Ask your dealer — or send purchase price direct and you 'will be supplied. Price, $28.50. GENERAL INSTRUMENT CORPORATION 423 Broome St., New York City Order your copy of Radio Broadcast from your news dealer or radio store. Make sure that he reserves a copy for you each month. If your favorite radio store does not stock the magazine write us giving name of radio dealer and address. li»5 . OtalogN Sets — Parts — Kits | Radio's Newest i You need this big FREE book. I A practical guide to success in I get building. Gives advanced I hook-ups. Shows all newoit I parts and kits, built up seta I ready for use, battery eliniina-l tors, radio's newest creations. I Writ* for Copy free, also send I name of radio fan. Send to-day .J BARAWIKCO. 1 102-109 S. Canal St., Chicago Rii3. TRANSMISSION PHENOMENA. FADING AND Radio News. Jan. 1926, pp. 956 ff. DISTORTION. "Unraveling a Broadcast Enigma"., A. Van A. Summers. Many data on fading and distortion of signals from broadcasting stations, which were accumulated by the American T.& T Company are presented. Conclusions arrived at indicate that the ether is not a perfect carrier of electromagnetic waves, especially when these waves are near large masses of iron and steel. Refraction and absorption are probably the causes for most of the distortion observed. The author discusses at some length the conclusions arrived at through these experiments. Rii4. STRAYS. AURORA BOREALIS. Radio News. Jan. 1926, pp. 064 ff. "New Facts About the Aurora Borealis", C. L. Davis. An experiment relating the effect of the Aurora Borealis on a telephone line, and the subsequent conclusions drawn from this phenomenon, are described. A frequency of one cycle for fifteen minutes was noted on a voltmeter. Rno. RADIO WAVES Radio News. Jan. 1026, pp. 066 ff. Are Radio V INDUCTION COILS RADIO WAVES. .. io Waves? ", I . Riley. An elementary explanation of the nature of radio waves, is given. Stress and strain, displacement of f elds, electrostatic and electro-magnetic fields of force, questions on radiation, current and voltage relations in antennae, are some of the subject? d:scussed. R 1 34.45. SUPER REGENERATIVE ACTION. SUPER-REGENERATIVE Radio News. Jan. 1926, pp. 976 ff. ACTION "Super Regenerat:on and the Future", A. K. Laing. The original Armstrong super regenerative circuit, modified somewhat, is presented, with points on construction and operation given. These, it is claimed, will make this type of amplification as popular as the super-heterodyne. The drawbacks of _the circuit are enumerated and taken up in detail. The circuit is said to give much more amplification on the higher frequencies than on the low ones. RH4.75. SUPER-HETERODYNE. SUPER-HETERODYNE. Radio News. Jan. 1926, pp. 082 ff. "An Improved Laboratory Super-Heterodyne" F. R. Pfaff. A seven-tube super-heterodyne covering the frequencies from 5 5pkc. to ;oookc. (5 50 to 50 meters) using plug-in coils, is described. The oscillator is connected ahead of the first detector in this circuit. Complete constructional data are given. RjSz. INDUCTORS. Radio News. Jan. 1926, pp. 086 ff. "Which Type of Coil is Best?", An exhaustive study of various types of coils, dealing with their overall efficiency, is presented. Circuits used in the measurement of resistance at high frequencies, graphs showing the efficiency and distributed capacity of coils and the result obtained through experimental hookups, are discussed. The best all around coil, according to the writer, consists of ordinary bell wire wound on a bakelite tube in the regular fashion. R2OI.7 USE OF HIGH-FREQUENCY OSCILLOGRAPH. TUBES, OSCILLOGRAPH Radio News. Jan. 1926, pp. o88ff. W.E. "The Cathode Ray Oscillograph In Radio Work", Dr. C. B. Bazzom. The author reviews the elementary principles concerning electric waves and their forms, referring to pitch and quality of sound as an analogy. To study these wave forms, the cathode ray tube, illustrated, is of great importance in high frequency circuits. The tube used here was developed bv the Western Electric Company. Electric and magnetic deflections of the electron stream through plates and coils near these electrons, picture the resulting wave forms for closer analysis. Lissajou figures produced, enable the experimenter to synchronize circuits or adjust them to manv different ratios of oscillations. R343 ELECTRON TUBE RECEIVING SETS, RECEIVERS, Radio Progress. Dec. 15, 1925.00. !3ff. Deresnadyne. "Revamping a Popular Radio", H. J. Marx. An analysis of the five-tube Deresnadyne receiver is given, showing the wiring diagram and method of operation. This receiver is equipped with a B-eliminator, and trickle charger for the A battery; the speaker is built in the cover, thus making this set complete. Oscillations are prevented in the tuned radio frequency stages by controlling the plate voltage on the tubes through a series resistance. The coil angle may also be varied, depending upon the type and characteristic of the tubes used. Other details of operation are mentioned. R342.7. AUDIO-FREQUENCY AMPLIFIERS. AMPLIFICATION. RADIO BROADCAST. Jan. 1926, pp. 308-312. Audio Frequency. "The Requirements for Better Audio Amplification," K. Clongh. An analysis of the various instruments used in sound production show that a good amplifying device should respond equally well to frequencies from 32 to 8192 cycles or more. A full logarithmic scale is considered best in plotting characteristics of amplifying units. Of considerable importance are the characteristics of the tubes used in audio amplifiers, and good results are obtained only when the entire amplifying unit is tested as one device. It is stated that in the present type of resistance-coupled units, the lower notes are somewhat suppressed. Transformers having a cruciform core construction seem to give best results. Reference is made to Mr. Crom's article on audio amplification in the Oct., 1925, RADIO BROADCAST. R342.6. RADIO-FREQUENCY AMPLIFIERS. R. F. AMPLIFIERS, RADIO BROADCAST. Oscillations in. Jan. 1926. pp. 3wff. " Methods for Controlling Oscillation in R. F. Circuits." J. Bernard. Many methods are used in r. f. amplifiers to prevent tubes from oscillating or to control oscillations. Some of these are discussed briefly by the author. A somewhat novel method is employed in the "Counterphase" circuit, diagrammed and described here. This scheme makes use of a combined resistance and capacity control, and is considered very effective over the entire range of frequencies to which the receiver is tuned. if Tested and approved by RADIO BROADCAST i FOR CLEAR, QUIET "B" POWER RADIO Storage "B" Battery iK Lasts Indefinitely-Pays for Itself Economy and performance unheard of before. Recharged at a nejrliKible cost. Delivers unfailing power that IB clear, pure and quiet. Approved an-t listed aa Standard by leading Radio Authorities, mclud , listed aa Standard by leading Radio Authorities, mclu in* POD. Radio Laboratories, Pop. Pci. Inst. Standards, Radio Newa Lab Lefax, In-., and other important Institutions. Equipped with Solid Rubber Ca*e,nn Insurance afcnlnac acid ard leakage. Extra . ved an OD. Ra heavy <-la ;a jara. lieavy rugged plates. Order yours todayl "" A/fOXJTJV Just fltate number of batteriea MUJNtl wanted and we w . _ will shin day order Isreceived. Extra off er: 4 batter-lea ineeries (96 volts). *!i>.r>u. P»/ exp csiman after examining batteries. 6 percent discount ror cash with order. Mail your order now! WORLD BATTERY COMPANY 1219 So. Wabash Ave., Dept. 78 Chicago* Hit Maker* of tke Famous World Radio'* A" Storage Battery Prices: 6-voU,logAmp.glX.S5; lsoAmp.tl3^5;240Amp.ftM<h AU equipped with Solid Rubtitr COM. World STORAGE BATTERIES Set your Radio Dials at 210 I meters I<»r the new 1000 1 watt World Storage Battery I Station. WSBG, Chicago. I Watch for announcement*. I MRC Station and Meter Log Now you can easily calibrate your dials in meters. A convenient station log and wavelength scale — Very simple to attach and is a permanent log. SOLD BY MAIL ONLY PRICES— 1 for 15c, 2 for 25c or 3 for 35c. MUELLER RADIO COMPANY 533 Bush St. Toledo, Ohio S-C PARTS AT WHOLE SALE PRICES SHU RE RADIO €0., 19 S. Wells, Chicago ,/Gets Everything but Noise! \< Amazing new Aerial guaranteed to eliminate all poi noises surh as leak} transformers, gen<-raiors. motor nui. . , Delcr> Plants, etc. Cuts static, regeneration howls and squeals ' 1-2. Dr. Gehriff, Oakland, Gal., says improves reception 60%. ilundrt-iis other testimonials. Wonderful results. Mr. Boeck , Grand Haven, Mich., heard 3 foreign stations during tests with Kane Antennae. Easy to install. 5ft 1OO Brings BLUE PRI NTWorking Drawings *** •*• Complete Instructions for Erecting. iBt send dollar blfl (or check), f i-nit ' o-ianti'v. Send TODAY. ' M4» W. Monroe. Chicago This is a good time to subscribe for RADIO BROADCAST Through your dealer or direct, by the year only $4.00 DOUBLEDAY, PAGE & CO, GARDEN CITY, NEW YORK Of "Your Town Be popular. In demand everywhere. Have fun Earn your welcome. Charm your friends with your SAXOPHONE Teach yourself, 3 free lessons give you quick easy start. Try any instrument in your own home 6 days free. See what you can do. Easy terms if you decide to buy. Send now for beautiful free literature. A postal brings details. Buescher Band Instrument Co. (4> 1221 Bue*cher Block Elkhart, Indiana