Radio Digest (Oct 1923-July 1924)

March 29, 1V0J, RADIO DIGEST — Illustrated OPERATING AND TROUBLE SHOOTING For the Owner of a .<•>) ® C-2'A RECEIVER 'it gets them all *<. i> OPERATING and Trouble 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 broadcast 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 pages 9 and I 0 this week the Moon C-2-A Receiver is described. Radiophans with other sets will also find these articles worth reading, particularly the notes on trouble finding. PLACE your detector tube (UV-200 or C-300) in the left socket next to the front panel. Your other tubes (TJV201A or C-301) should be placed in the other sockets, as they are interchangeable. After the batteries have been correctly connected, as per diagram, a good ground connection must be obtained. Proper reception with the Moon receiving set, without antenna, is dependent on a good ground connection, and too much stress cannot be laid on this point. A ground connection which has been satisfactory for a set using an antenna may or may not be suitable for the Moon set. Ground We have already mentioned the importance of obtaining a good ground for the proper operation of this set without antenna. The valve stem of a radiator may make a good ground connection, but a clean connection to the cold water pipe is even better. A metal rod driven 3 or i feet into the earth will usually give good results. In any case be sure the ground connection is filed clean and soldered. Paint, nickel plating or rust may act as an insulator. A copper plate %-inch in thickness, 4 feet square and buried about 3 feet in moist earth with number H wire soldered connection, makes the host possible Radio ground: Be sure your ground connection is a good ground connection. Aerial Where an aerial is in use and reception on the ground connection alone is not satisfactory, your aerial (inside or outside) may be used as a counterpoise ground by attaching it to ground binding post number 11, with or without the ground wire. The counterpoise ground connection will be found very effect Tuning' Attach to binding post the wire leading from your ground or counterpoise ground connection. Set coupling number 1 anumber 2 at 0 graduation, and number 3 in center. Place primary condenser dial number 5 between 50 and 80. Turn switch number 4 to GXD "Antennaless" (if aerial is used with ground connection, attach aerial lead-in wire, which should be number 14 to 18 gauge insulated, to antenna binding post), and turn switch number 4 to ANT (Antenna). Turn rheostats numbers 8 and 9 all the way to the right, and rheostat number ten halfway to the right. Before proceeding, lift cover of set and see that all tubes are lighted. If a hissing sound Is heard, turn number 9 lightly until hissing stops. Your set is now ready to tune. Turn tuning dial number 6 to the left very slowly until whistle is heard. This means you are near a station. Turn number 8 to the left until the whistle or howl stops. Readjust vernier on dial 6 for maximum signal strength, and try the effect of changing the positions of numbers 1, 2 or 3. Vary the voltages of the red and green wires on the B batteries until the tubes do not make a hissing or frying sound. A little practice will make you efficient, and you will soon find it easy to tune in distant stations with complete satisfaction on a Moon receiver. DZ After you have been able to tune in your local stations satisfactorily and are familiar with your set, we make the following suggestions for obtaining distance stations: The primary condenser number 5 may be set at 40, 60 or 80. In general (Continued on page 10) ^-Volume &ontrol-\ j R3 (New Model), with Volume >*►$ Control • $35.00 Ml requiring no battery for its operation 35.00 Ohe Slepro. 3-29 This instrument sets a new and higher standard of adaptability, refinement and economy of operation. With Volume Control (as illustrated) $35.00 at dealers everywhere. THE MAGNAVOX CO., OAKLAND, CALIF. New York Office: 370 SEVENTH AVENUE Perkins Electric Limited, Canadian 'Distributors, Toronto, Montreal, Winnipeg RADIO TALKS Other things being equal, the volume of output from a vacuum tube will be more or less in proportion to the size of the tube. Then it is plain that we should not /"_ expect quite as much amplification from a small tube as from a expect quite as much amplification from a small tube as from a ><* /^Z-/£/?~ /i/i large one, yet if you match the efficiency of the tube with an efficient \^).^/. C/tctU/C££^n^ receiving outfit you might be pleasantly surprised. e~ ~S Genuine & Radio Apparatus De Luxe A condenser so good— you -will be anxious to build a new set around it rather than install it in your old set. When you see one you will appreciate it. PUELL MANUFACTURING COMPANY Z977 Cottage Grove Ave. CHICAGO