Radio Broadcast (May 1928-Apr 1929)

.RADIO BROADCAST ADVERTISER. Here9 s the Answer to every question about the principles, methods, or apparatus of radio transmitting and receiving. THE RADIO MANUAL A Complete Course in Radio Operation In a Single Volume A Handbook for Students Amateurs Operators Inspectors For the first time an entire course of training in one book — the most complete and up-to-date work on radio. Developed simply and clearly from the elementary stage right through all phases of principles, practise, and apparatus so that a beginner with no knowledge of electricity ,;et all he needs eithei for amateur operation or to qualify for a government license as operator or inspector. ,; I Prepared by Official Examining Officer The author, G. E. Sterling, is Radio Inspector and Examining Officer, Radio Division, U. S. Dept. of Commerce. The book has been edited in detail by Robert S. Kruse for five years Technical Editor of QST., the Magazine of the Radio Relay League. Many other experts assisted them. 16 Chapters Cover: KS"? tors and Generators; Storage Batteries and Charging Circuits; The Vacuum Tube; Circuits Employed in Vacuum Tube Transmitters; Modulating Systems; Wavemeters; Piezo-Electric Oscillators; Wave Traps; Marine Vacuum Tube Transmitters; Radio Broadcasting Equipment; Arc Transmitters; Spark Transmitters; Commercial Radio Receivers; Radio Beacons and Direction Finders; Radio Laws and Regulations; Handling and Abstracting Traffic. l\r_«., l—.S^-mniln-n never before available such New Information as a compiete description of the Western Electric 5 Kilowatt BroadcastingTransmitter; description and circuit diagram of Western Electric Superheterodyne Radio Receiving Outfit type 6004-C; NavyStandard 2-KiIowatt Spark Transmitter; etc., etc Every detail up to the minute. Free Examination "The Radio Manual" has just been published. Nearly 700 pages. Profusely illustrated. Bound in Flexible Fabrikoid. The coupon brings the volume for free examination. If you do not agree that it is the best Radio book you have seen, return it and owe nothing. If you keep it, send the price of $6.00 within ten days. Order on This Coupon \ D. Van Nostrand Co., Inc. 8 Warren St., New York Send me THE RADIO MANUAL for examination. Within ten days after receipt I will either return the volume or send you $6.00, the price in fall. (Radio Broadcast 2-29) Name St. & No City and State — "T^lr BM>to co. tubes, u,;~ dio enten hook-up wire 'The Braid Slides Bac£ FREE SAMPLE Send us the name and address of your dealer and we will send you a sample package of Braidite FREE. Include 10c for Postage. We do this because we want you to get acquainted with Braidite and prove to yourself its many exclusive features. Send for your sample NOW. At All Dealers 25 Feet Stranded 35c $ 25 Feet i Solid 30c I Red Green » Yellow Blue -Black If Cornish Wire Co > ^ 30 Church Street NewYorkCity j| False Economy Is Costly Nothing is likely to prove as costly as a cheaply made, over-rated condenser or resistor. Whether you are a manufacturer, professional set builder or experimenter, you cannot afford the high cost of a cheap condenser or resistor. Aerovox condensers and resistors are conservatively rated and thoroughly tested. They are not the most expensive, nor the cheapest but they are the best that can be had at any price. A COMPLETE CATALOG ™'th ilIu*tr,a tions and detailed descriptions may be obtained free of charge on request. The Aerovox Research Worker is a monthly publication that will keep you abreast of the latest radio development:.. Your name will be put on the mailing list free of charge on request. AEROVOX WIRELESS CORP 76V2 Washington St., Bklyn., N. Y. yEy PRODUCTS THAT ENDURE Jenkins & Adair Microphone Mixing Panel TYPE 3-B For Broadcasting, Electrical Recording, and Power Speaker Systems THE 3-B Mixing Panel is designed to accommodate almost any combination of pickup circuits up to a total of six. Any three of these may be made to pass through the three Compound Mixing Controls at the same time, and instantaneous switching is available for the remaining circuits. The incoming circuits may consist of condenser transmitters, carbon microphones, telephone lines or low impedance phonograph pickup devices, in practically any combination. When a single input circuit of extremely low level is encountered, the positions not in use may be cut entirely out of the system, thus causing no loss whatever to the weak incoming signal. The panel is 5/16 black sanded Bakelite, 19 in. wide and 12* in. high. Detailed information and circuit is shown in bulletin No. 7, which we will be glad to mail to you. The net price in the U. S. A. and Canada is $275.00, F. O. B. Chicago. J. E. JENKINS & S. E. ADAIR, Engineers 1500 N. Dearborn Parkway, Chicago, U. S. A. Send for our bulletins on Broadcasting Equipment • february. 1929 page 278 •