Radio Digest (July 1924-Apr 1925)

July 26, 1924 R A D I O D I G E S T— Illustrated For the Owner of a Nightingale 4-Tube Portable Set "^-vPERATING an Trouble CJ Shooting" is a Radio Digest feature whose purpose is to study the late models of various standard receiving sets and to show the newly initiated Radiocast listener, who has purchased such a set, how he can operate it to get the best there is in it and how he can overcome minor difficulties which may be causing some trouble. On page 7 this week the Nightingale 4-Tube Portable Set is described. Radiophans with other sets will also find these articles worth while reading, particularly the notes on trouble finding. THIS portable outfit comes equipped with aerial wire, ground wire, tubes, batteries and loud speaker. Aerial and ground wires are looped around four hooks in the cover of the case. The aerial wire which is about 100 feet long is equipped at one end with an insulator which can be conveniently fastened to the branches of some tree or if necessary the whole wire can be tossed up over projecting limbs. The terminal end connects to the antenna post of the set. A convenient ground connection is also looped around these hooks. This insulated wire has a terminal at one end to be connected to the ground post of the receiver, while the other end has a heavy clamp which can be attached to a metal rod or post driven into the ground. The loud speaker is somewhat unusual in the sense that it consists of a unit enclosed in a small removable pocket snapping to the inside of the receiver. The horn is made up of a piece of leatherette covered surface folding compactly to a flat form which is hooked into a metal strip in the inside of the top cover. When unfolded, the ends snapped together by means of snap fasteners, a three corner horn is formed in the small end of which the unit fits into place. A metal seat on the back of the unit can be hooked on to the strip in the top cover thus providing a mounting for the unit over the set. This is not shown in place in the illustration so as to avoid obstructing the view of the controls of the set. Four dry cell tubes are furnished the type along the .06 amperes filament current consumption but with standard bases are used. Therefore only three dry cells are necessary for current supply. These dry cells are contained in the left hand compartment of the set while four small 22% volt B battery units are enclosed in the right hand compartment. The set is completely connected up ready for operation with the* exception of the connection of the loud speaker, aerial and ground. Phone Connections When connecting phone or loud speaker, and you wish to use: 4 tubes: Connect terminals to binding posts marked Ph and 2 AF. 3 tubes: Connect terminals to binding post marked Ph and 1 AF. 2 tubes: Connect terminals to binding posts marked plus B DET. and DET. "Operation Place the set with the tubes away from ,„ "Have Experimented with every make— Found Ail-Americans Best" By C. O. Bynum, "I have used and experimented with every make of audio frequency transformers on the market— but found the All-American' best for every purpose. "I. have a tuner, detector and a twostage amplifier of my own make and design. On my first step I use an AllAmerican ratio 10-1 and on the second step a 5-1 All-American — and I want you to know that I have some amplification, believe me. "Can tune in on stations in Chicago and dozens of others, plugging my phones in on the second step. All-American Audio Frequency Transformers. Come in three ratios: 3:1. $4.50; 5:1, 10:1, $4.75. The best — no necessity to pay more. Temple, Okla. "I can plainly understand all announcements seventy feet away from the phones. I don't use a loud speaker — just hang my phones on the wall and the programs can be heard all over the house — and above all, perfect. 'All-American Transformers saved the day for me. You make the best on the market." SPECIAL OFFER Just out! New All-American "Radio Key Book." 48 pages of valuable hook-ups and up-to-the-minute Radio information. "Worth a dollar!" Send 10c in coin or .stamps to Rauland Mfg. Co., 2610 Coyne St.. Chicago. All the better dealers sell the "ALL-AMERICAN" RAULAND MFG. CO., 2640 Coyne St., PIONEERS IN THE INDUSTRY CHICAGO Audio and Radio Frequency; Power Amplifying (input and output) Over three-quarter million in use. Standard on the better sets All~Amierican AMPLIFYING TRANSFORMERS Largest Selling Transformers in the World the knobs nearest you. When set is so placed: The farther right hand tube is the Radio frequency amplifier. The nearer right hand tube is the detector. The nearer left hand tube is the first stage of audio frequency amplification. The farther left hand tube is the second stage of audio frequency amplification. Dial 3 controls the wave length received. Move the right-hand rheostat No. 2 lever up until the tubes become noisy, then lower slightly. The left-hand lever No. 1 controls the Radio frequency tube, and the right-hand lever No. 2 controls the detector and audio amplification tubes. Throw the rheostat lever No. 1 up to the top, slowly rotate the tuner dial No. 3; then the wave will cause the Radio frequency tube to oscillate, emitting a whistling sound, lower this lever No. 1 until the whistle ceases and the music comes in, usually slight adjustments are necessary — both with the tuner dial and the hand levers, to perfect the reception. The operator should record the dial positions for the various stations, thereby, being enabled to turn at will to the station desired, provided the batteries or aerial have not been changed. Too much battery (rheostat too high) on the Radio amplifier will cause this tube to spill (become paralyzed), and this is easily corrected by lowering the rheostat lever and then raising it again, but not so high as to cause this tube to repeat the "spill." In selecting new hard tubes, try each one of the three in the Radio frequency socket, as this tube should be the most sensitive in the set. Place tubes in sockets pressing down firmly and turning clockwise until locked into place. Turn on rheostat and all tubes must burn. Connect the battery clamp that is wired to the instrument post -marked plus B DET. to 18 volt stud or terminal of the B battery. Various stations are tuned in by slowly turning the tuner dial No. 3. The plus B detector battery clamp must be shifted up or down on the B battery terminals until the best tones are received, 16 to 18 volts usually being best. It is also necessary to move the rheostat knob in order to secure the best volume and tone. A little experimenting will soon indicate the best combination for local conditions. Do not burn tubes brighter than is necessary for good reception, they will last longer. Poor operation is usually caused by some defect outside the set. Noises are usually due to defective or discharged batteries, a poor ground, or poor wire connections. Scrape all wires till bright where connections are made. Caution: When connecting up set remove all tubes until set is connected up. Then place one tube in set and try rheostat in order to be sure you haven't misplaced B battery wires. This will save your tubes. TT HAS been the tradition of the Federal Company, over ■*• its 25 years in manufacturing Electrical Communication Equipment, that jt must give its users the highest refinements of the art. Federal tradition will not permit the manufacture of a radio set just for radio noises. Each and every manufacturing necessity to produce a harmonious set is known to Federal Engineers, and no Federal set is produced without them. Federal radio sets are built with two thoughts in mind — first: simplicity of operation, but three controls being necessary— second: special controls for refinement if the user is interested in reproducing all the beauty of tones that fill the air. "Lovers of good music" know why Federal is better, and know the real value of the refinement placed at their command to make it easy to obtain the clearest tone reception. FEDERAL TELEPHONE & TELEGRAPH CO. Buffalo, N. Y. Boston New York Philadelphia Chicago Pittsburgh San Francisco federal " StandardRyVDJQ Products Look for this sign ■mmmmm BS> m H^^^^^VTT Jw Bridgeburff Canada London England