Radio Broadcast (May 1927-Apr 1928)

172 RADIO BROADCAST ADVERTISER t~0 PC — itherproof Aerial that carit corrode It is not necessary to take down your aerial each year to remove corrosion and soot that have accumulated on its surface, if you install a Beldenamel Aerial. Each strand of a Beldenamel Aerial is protected by a heavy coat of baked enamel which resists corrosion under the worst atmospheric conditions. A Beldenamel Aerial stays bright under this protective coating and maintains maximum range and volume for your set. A good aerial is just as important as good tubes. Get the best results from your radio receiver by asking your dealer for a Beldenamel Aerial today. Belden Manuf act&irisig Co. 23ia-A S. Western Ave., Chicago AERIAL WIRE What Kit Shall I Buy? (Continued) 221. LR4 Ultradyne — Nine-tube super-heterodyne: one stage of tuned radio frequency, one modulator, one oscillator, three intermediate-frequency stages, detector, and two transformer-coupled audio stages. 222. Greiff Multiplex — Four tubes (equivalent to six tubes); one stage of tuned radio frequency, one stage of transformer-coupled radio frequency, crystal detector, two stages of transformer-coupled audio, and one stage of impedance-coupled audio. Two controls. Price complete parts, $50.00. 223. Phonograph Amplifier — A five-tube amplifier device having an oscillator, a dectector, one stage of transformer-coupled audio, and two stages of impedance-coupled audio. The phonograph signal is made to modulate the oscillator in much the same manner as an incoming signal from an antenna. 224. Browning-Drake — Five tubes; one stage tuned radio frequency (with special neutralization system), regenerative detector (tickler control), three stages of audio (special combination of resistance and impedance-coupled audio). Two controls. 225. Aero Short-Wave Transmitting Kit consists of interchangeable coils to be used in tuned-plate tuned grid circuit. Kits of coils, two choke coils, and mountings, can be secured for 20-40 meter band, 40-80 meter band, or 90-180 meter band for 8>i2.oo USE THIS COUPON FOR KITS Radio Broadcast Service Department Garden City, New York. Please send me information about the following kits indicated by number; Name Address (Number) (Street) (City)' " (State) " ORDER BY NUMBER ONLY. This coupon must accompany each order. RB12-27 Distress Calls From The Air THE recent distress calls from aircraft in flight have been referred to in the press as the first from aircraft, even by some of our contemporary radio publications which should know better. Seventeen years ago, a dirigible, the America, attempted a transatlantic flight, trailing its reserve fuel supply on a 340-foot steel cable below it. After making a flight of several hundred miles, the crew found that the tugging trailer threatened the destruction of the craft. Jack Irwin summoned aid by radio and the steamship Trent responded. No lives were lost. This was the first SOS from the air! AFIVE-KW. broadcasting station is to be erected on Mt. Victoria, overlooking the harbor of Wellington, New Zealand. This will be the most powerful broadcasting equipment in the Pacific. USE THIS COUPON FOR COMPLETE SETS Radio Broadcast Service Department Radio Broadcast, Garden City, New York. Please send me information about the following manufactured receivers indicated by number; Name Address (Number) (Street) (City) (State) ORDER BY NUMBER ONLY This coupon must accompany each order. RB 12-27 L ight Socket Power is within your reach WHEN you buy a Sterling ''B" Power Unit, you get power regulation which means tone quality at its best. You get power for any set having 4 to 8 tubes including a power tube. You get light socket convenience and the utmost in reiia bility. At the remarkably low price of $28.50, Sterling "B" Power Units are within the reach of every purse. A Sterling demonstration will be a revelation. Any Sterling dealer will be glad to prove it. "B" Socket Power '•Price $28= complete with ^Raytheon Tube THE STERLING MFG. COMPANY 2831 Prospect Avenue Cleveland, Ohio [PRODUCTS 1 Complete Electric Operation 5553 $22 List with this A B C Power Unit used with UX 226 and 227 Tubes UX 280 Rectifier Tube This newest Dongan achievement — No. 5553 ABC Power Supply Unit — together with UX 226 and 227 A C Filament Supply Tubes and the UX 280 Rectifier Tube equips your set to secure all the needed power from the light socket. No. 5553 Unit contains one transformer and two chokes especially designed for these particular tubes which take the place of standard 20 1 A tubes. Sets equipped with either one or two UX 171 Power Amplifier tubes are also furnished with adequate power. You will find a new enjoyment in your radio — electrically operated by the new Dongan ABC Power Supply Unit. If your dealer cannot supply you send check or money order direct to factory. Complete data upon request. DONGAN ELECTRIC MFG. CO. 2991-3001 Franklin St., Detroit, Michigan ^TRANSFORMERS of MERIT for FIFTEEN YEARS,,