Radio Broadcast (May 1928-Apr 1929)

54 RADIO BROADCAST ADVERTISER New Aero Circuits for Either Battery or A. C. Operation Proper constants for A. C. operation of the Improved Aero-Dyne 6 and the Aero Seven have been studied out, and these excellent circuits are now adaptable to either A. C. or battery operation. A. C. blue prints are packed in foundation units. They may also be obtained by sending 25c for each direct to the factory. Aero Universal Tuned Radio Frequency Kit Especially designed for the Improved Aero-Dyne 6. Kit consists of 4 twice-matched units. Adaptable to 201-A, log, 112, and the new 240 and A. C. Tubes. Tuning range below 200 to above 550 meters. Code No. U-16 (for .9005 Cond.) $15.00 Code No. U-163 (for .00035 Cond.) 15.00 Aero Seven Tuned Radio Frequency Kit Especially designed for the Aero 7. Kit consists of 3 twice-matched units. Coils are wound on Bakelite skeleton forms, assuring a gs per cent, air dielectric. Tuning range from below 200 to above 550 meters. Adaptable to 210-A, igg, 112, and the new 240 and A. C. Tubes. Code No. U-12 (for .0005 Cond.) $12.00 Code No. U-123 (for .00035 Cond.) 12.00 You should be able to get any of the above Aero Coils and parts from your dealer. If he should be out of stock order direct from the factory. AERO PRODUCTS, INC. 1772 Wilson Ave. Dept. 109 Chicago, 111. Flexible A. C. Superheterodyne An aristocrat of a famous family especially designed to meet the demands of that select circle of set builders who desire the finest in receiver construction with cost a secondary consideration. Complete detailed blueprints on this unique combination of the best radio principles, $1.00 postpaid. All specified parts supplied. Price list on request. DANA ADAMS 222 East 52nd St. N. Y. City Western Office: 604 Davis St., Evanston, 111. Radio Convenience Outlets Wire your home for radio. These outlets fit any standard switch box. Full instructions with each outlet. No. 135— For Loud Speaker $1.00 No. 137 — For Battery Connections 2.50 No. 136— For Aerial and Ground 1.00 With Bakelite Plates Now furnished with a rich satin brown Bakelite plate, with beautiful markings to harmonize, at 25 cents extra. See Illustration. At Your Dealers Yaxley Mfg. Company Dept. B, 9 So. Clinton St. Chicago, 111. Manufacturers' Booklets A Varied List of Books Pertaining to Radio and Allied Subjects Obtainable Free With the Accompanying Coupon R EADERS may obtain any of the booklets listed below by useing the coupon printed on page 57. Order by number only. 1. Filament Control — Problems of filament supply, voltage regulation, and effect on various circuits. Radiall Company. 2. Hard Rubber Panels — Characteristics and properties of hard rubber as used in radio, with suggestions on how to "work" it. B. F. Goodrich Rubber Company. . 3. Transformers — A booklet giving data on input and output transformers. Pacent Electric Company. 5. Carborundum in Radio — A book giving pertinent data on the crystal as used for detection, with hook-ups, and a section giving information on the vse of resistors. The Carborundum Company. 7. Transformer and Choke-Coupled Amplification— Circuit diagrams and discussion. All-American Radio Corporation. 9. Volume Control — A leaflet showing circuits for distortionless control of volume. Central Radio Laboratories. 10. Variable Resistance — As used in various circuits. Central Radio Laboratories. 11. Resistance Coupling— Resistors and their application to audio amplification, with circuit diagrams. DeJur Products Company. 12. Distortion and What Causes It — Hook-ups of resistance-coupled amplifiers with standard circuits. AllenBradley Company. 15. B-Eliminator and Power Amplifier — Instructions for assembly and operation using Raytheon tube. General Radio Company. 15a. B-Eliminator and Power Amplifier — Instructions for assembly and operation using an R. C. A. rectifier. General Radio Company. 16. Variable Condensers — A description of the functions and characteristics of variable condensers with curves and specifications for their application to complete receivers. Allen D. Cardwell Manufacturing Company. 17. Bakelite — A description of various uses of bakelite in radio, its manufacture, and its properties. Bakelite Corporation. 20. Audio Amplification — A booklet containing data on audio amplification together with hints for the constructor. All American Radio Corporation. 21. High-Frequency Driver and Short-Wave Wavemeter — Constructional data and application. Burgess Battery Company. 46. Audio-Frequency Chokes — A pamphlet showing positions in the circuit where audio-frequency chokes may be used. Samson Electric Company. 47. Radio-Frequency Chokes — Circuit diagrams illustrating the use of chokes to keep out radio-frequency currents from definite points. Samson Electric Company. 48. Transformer and Impedance Data — Tables giving the mechanical and electrical characteristics of transformers and impedances, together with a short description of their use in the circuit. Samson Electric Company. 49. Bypass Condensers — A description of the manufacture of bypass and filter condensers. Leslie F. Muter Company. 50. Audio Manual — Fifty questions which are often asked regarding audio amplification, and their answers. Amertran Sales Company, Incorporated. 51. Short-Wave Receiver — Constructional data on a receiver which, by the substitution of various coils, may be made to tune from a frequency of 16,660 kc. (18 meters) to 1909 kc. (150 meters). Silver-Marshall, Incorporated. 52. Audio Quality — A booklet dealing with audio-frequency amplification of various kinds and the application to well-known circuits. Silver-Marshall. Incorporated. 56. Variable Condensers — A bulletin giving an analysis of various condensers together with their characteristics. General Radio Company. 57. Filter Data — Facts about the filtering of direct current supplied by means of motor-generator outfits used with transmitters. Electric Specialty Company. 59. Resistance Coupling — A booklet giving some general information on the subject of radio and the application of resistors to a circuit. Daven Radio Corporation 62. Radio-Frequency Amplification — Constructional details of a five-tube leceiver using a special design of radiofrequency transformer. Camfield Radio Mfg Company. 63. Five-Tube Receiver — Constructional data on building a receiver. Aero Products, Incorporated. 66. Super-Heterodyne — Constructional details of a seven-tube set. G. C. Evans Company. 70. Improving the Audio Amplifier — Data on the characteristics of audio transformers, with a circuit diagram showing where chokes, resistors, and condensers can be used. American Transformer Company. 72. Plate Supply System — A wiring diagram and layout plan for a plate supply system to be used with a power amplifier. Complete directions for wiring are given. Amertran Sales Company. 80. Five-Tube Receiver — Data are given for the construction of a five-tube tuned radio-frequency receiver. Complete instructions, list of parts, circuit diagram, and template are given. All-American Radio Corporation. 81. Better Tuning — A booklet giving much general information on the subject of radio reception with specific illustrations. Primarily for the non-technical home constructor. Bremer-Tully Manufacturing Company. 82. Six-Tube Receiver — A booklet containing photographs, instructions, and diagrams for building a six-tube shielded receiver. Silver-Marshall, Incorporated. 83. Socket Power Device — A list of parts, diagrams, and templates for the construction and assembly of socket power devices. J efferson Electric Manufacturing Company. 84. Five-Tube Equamatic — Panel layout, circuit diagrams, and instructions for building a five-tube receiver, together with data on the operation of tuned radio-frequency transformers of special design. Karas Electric Company. 85. Filter — Data on a high-capacity electrolytic condenser used in filter circuits in connection with A socket power supply units, are given in a pamphlet. The Abox Company. 86. Short-Wave Receiver — A booklet containing data on a short-wave receiver as constructed for experimental purposes. The Allen D. Cardwell Manufacturing Corporation. 88. Super-Heterodyne Construction — A booklet giving full instructions, together with a blue print and necessary data, for building an eight-tube receiver. The George W. Walker Company. 89. Short-Wave Transmitter — Data and blue prints are given on the construction of a short-wave transmitter, together with operating instructions, methods of keying, and other pertinent data. Radio Engineering Laboratories. 90. Impedance Amplification — The theory and practice of a special type of dual-impedance audio amplification are given. Alden Manufacturing Company. 93. B-Socket Power — A booklet giving constructional details of a socket-power device using either the BH or 313 type rectifier. National Company, Incorporated. 94 Power Amplifier — Constructional data and wiring diagrams of a power amplifier combined with a B-supply unit are given. National Company, Incorporated. 100. A, B, and C Socket-Power Supply — A booklet giving data on the construction and operation of a socket power supply using the new high-current rectifier tube. The Q. R. S. Music Company. 101. Using Chokes — A folder with circuit diagrams of the more popular circuits showing where choke coils may be placed to produce better results. Samson Electric Company. 22. A Primer of Electricity — Fundamentals of electricity with special reference to the application of dry cells to radio and other uses. Constructional data on buzzers, automatic switches, alarms, etc. National Carbon Company. 23. Automatic Relay Connections — A data sheet showing how a relay may be used to control A and B circuits. Yaxley Manufacturing Company. 26. Dry Cells for Transmitters— Actual tests given, well illustrated with curves showing exactly what may be expected of this type of B power. Burgess Battery Company. 27. Dry-Cell Battery Capacities for Radio Transmitters— Characteristic curves and data on discharge tests. Burgess Battery Company. 28. B Battery Life — Battery life curves with general curves on tube characteristics. Burgess Battery Company. 30. Tube Characteristics — A data sheet giving constants of tubes. C. E. Manufacturing Company. 32. Meters for Radio — A catalogue of meters used in radio, with diagrams. Burton-Rogers Company. 33. Switchboard and Portable Meters — A booklet giving dimensions, specifications, and shunts used with various meters. Burton-Rogers Company. 35. Storage Battery Operation — An illustrated booklet on the care and operation of the storage battery. General Lead Batteries Company. 36. Charging A and B Batteries — Various ways of connecting up batteries for charging purposes. Westinghouse Union Battery Company. 37. Why Radio Is Better with Battery Power — Advice on what dry cell battery to use; their application to radio, with wiring diagrams. National Carbon Company. 53. Tube Reactivator — Information on the care of vacuum tubes, with notes on how and when they should be reactivated. The Sterling Manufacturing Company. 69. Vacuum Tubes — A booklet giving the characteristics of the various tube types with a short description of where they may be used in the circuit. Radio Corporation of America. 77. Tubes — A booklet for the beginner who is interested in vacuum tubes. A non-technical consideration of the various elements in the tube as well as their position in the receiver. Cleartron Vacuum Tube Company. 87. Tube Tester — A complete description of how to build and how to operate a tube tester. Burton-Rogers Company. 91. Vacuum Tubes — A booklet giving the characteristics and uses of various types of tubes. This booklet may be obtained in English, Spanish, or Portuguese. DeForest Radio Company. 92. Resistors for A. C. Operated Receivers — A booklet giving circuit suggestions for building a. c. operated receivers, together with a diagram of the circuit used with the new 400-milliampere rectifier tube. Carter Radio Company. 102. Radio Power Bulletins — Circuit diagrams, theory constants, and trouble-shooting hints for units employing the BH or B rectifier tubes. Raytheon Manufacturing Company. 103. A. C Tubes — The design and operating characteristics of a new a. c. tube. Five circuit diagrams show how to convert vell-known circuits. Sovereign Electric & Manufacturing Company. 41. Baby Radio Transmitter of 9XH-9EK — Description and circuit diagrams of dry-cell operated transmitter. Burgess Battery Company. 42. Arctic Radio Equipment — Description and circuit details of short-wave receiver and transmitter used in Arctic exploration. Burgess Battery Company. 58. How to Select a Receiver — A commonsense booklet describing what a radio set is, and what you should expect fromit. in language that any one can understand. Day-Fan Electric Company. 67. Weather for Radio — A very interesting booklet on the relationship between weather and radio reception, with maps and data on forecasting the probable results. Taylor Instrument Companies. (Continued on page 55)