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www.americanradiohistory.com 464 Radio News for Nove,ulicr, 1928 FANS: third big edition Don't MISS This Big Issue COMPILED BY THE STAFF OF RADIO NEWS Cdóóo Over 150,000 Copies Already Sold PUBLISHING CO 4".." NEW YORK CITY Compiled by the Staff of RADIO NEWS Completely Revised-Up -to -the -Minute 1001 RADIO QUESTIONS AND ANSWERS, the most sensational seller in the radio field, is now in its third new and revised edition. No one interested in radio should be without a copy. The staff of RADIO NEWS, the leading fan magazine, has striven to make 1001 RADIO QUESTIONS AND ANSWERS the foremost work of its kind available. There is a full and complete explanation of every worthwhile circuit that has appeared since the beginning of radio, not only the explanation, but also complete diagrams from which the set can be con- structed. Concise, authentic answers to every question that can possibly be asked concerning the many and varied branches of radio reception on both short -wave and broadcast bands. FANS! Don't hesitate! Get your copy today! Over 112 pages - fully ' illustrated -- 50e THE COPY ASK YOUR NEWSDEALER OR WRITE DIRECT large magazine size Co `'e 4qo 4éa' yeti: Si 15° _ °,.ti4- o a y tis.0045.° 230 Fifth Avenue, New York, N. Y. Please say you saw it in RADIO .\'TTVS
www.americanradiohistory.com hadio News for .V ovcmbcr, 1928 COUPLING ADJUSTMENT A final word regarding the adjustment of the automatic coupling arrangement may be required. 'l'he cam should be slipped over the rear of the condenser shaft, with the fiber can] toward the rear and with the fiat side uppermost. Now, with the con - denser plates all meshed, turn the cam until its toe is just level with the bottom side of the bakelite strip upon which the coil is mounted; then. tighten the set -screw in the collar on the cam. Next, loosen the setscrew in the brass pin on the lower rod of the coil carriage; let this pin slip along until it rests against the fiber cauu, and then tighten the set -screw. With these adjustments made, it will he found .that the primary coil moves as the condenser is rotated ant, when the condenser plates are entirely unmeshed, the pin should slide just to the point of the cans. This is the correct adjustment. In the event that there should he no reception when the Pre -Selector is first put into operation, and all connections and wiring are found to be correct, test the tube used in the oscillator socket, V2. The whole action of the Pre- Selector depends on the oscillator, and a poor or defective tube here will prevent proper reception APPARATUS. REQUIRED 'l'he following is a complete list: One variable condenser, .00035-utf. (C1); One variable condenser, .00025-mf. (C2); One equalizer condenser, 2- 20 -uunf. (C3); One midget condenser, 50-mmf. (C4) ; One fixed condenser, .00025-mf., with grid - leak clips (C5) ; One fixed condenser, .0001 -mf. (C6); One by -pass condenser, 0.5 -mf. (C7); One antenna coupler, with provision for automatic coupling variation (L1); One R.P. transformer (L2); One R.F. choke coil, 85- millihenry (L3); One rheostat -switch, 50 -ohm (lt1-SW1); One volume -control potentiometer, 25,000 - ohm (112); One grid leak, 2- megohnl (R3) ; One aerial switch, single -pole double -throw (SW2) ; Two vacuum tubes, 199 -type (V1 and V2); Eight binding posts, push -type; Two vernier dials, illuminated -type; One front panel, 7 x 14 x 3/16 -inch; One binding -post strip, 1 x 10 x 3/16 -inch; One wooden baseboard, 13r /y x 7 x % -inch; Two angle brackets, 1 x %-inch; Two tube sockets, UN -type. Station Build Your Power Pack Around the snyitleseal `'::xixMt.. 1ghRi T c :wl' o T dlri/D _11ü1i4 TRUVOLT DIVIDER 1 . '. Pat. 1,676,869 and Pats. Pending A Universal Voltage Separator THIS new Truvolt Divider offers you the complete resistance combination for constructing with utmost ease a remarkably efficient power pack suitable for operating any type of receiver up to 12 tubes. By dividing the filtered voltage into usable values, it eliminates all necessity of mathematical calculations in constructing a power pack. It does away with a great deal of wiring and the need of voltage regulator tubes. It makes it possible to build a power supply device which is universal in its application. board or sub -panel, or used as the front panel on a metal cabinet, at the same time providing binding posts for all "B" and "C" voltages. Price- $12.50 Electrad Specializes in a Full Line of Controls for all Radio Purposes including Television. ELECTRAD, INC. VA -il Dept. New York. N. T. St., N 175 Varick copy of th' Please send me FREE my copy l and Electrad Truvolt Divider for Grien' on your mailing out Data and information. Case made of genuine bakelite, it will add a smart appearance to any unit. Five potentiometer type control ..... knobs show values on a scale of high Address......... visibility. Can be mounted on base - .State City .............. Write for Free Circulars and Full Informa, E LECT RkQ Name ............. ..... ., NEW YORK 326 METERS - 920 KILOCYCLES and W2 %AL, 30.91 METERS is owned and operated by the publishers of this magazine Our Editors will talk to you several tunes every week - See yourÌewspaper for details TUNE IN ON WRNY vLECHTNEin SUPERIOR CONDENSERS Best for power packs, power amplifiers, and f s. the countless uses to which high -grade ondensers are put. Conservatively rated, dependable in operation, and very reasonably priced, Flechtheim condensers have won for I,emselves an enviable reputation -a fact readily attested to by custom set builders, radio amateurs and experimenters everywhere. Complete Line from 250 to 3,000 Volts D. C. Trite for New Catalog A. M. FLECHTHEIM & CO., INC. 136 LIBERTY ST., NEW YORK,N. Y.Dept.NR. Barawik, the first and oldest radio specialty house, offers you unusual service this year. Bigger stocks, quicker shipments, lower prices. Deal with an old established, reliable house. Get honest goods, honest service, honest prices. Barawlk service makes you more money. Send now for big new Catalog showing lowest wholesale prices. BARAWIK CO. Mall This Coupon Now for Free Rodio Guide Name Addy... /'lease say you saw it in RADIO NEWS
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