Radio mirror (Jan-Oct 1923)

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May is, 19^3 RADIO DIGEST 19 Questions and Answers Bugrbear of Body Capacity (2427) arm. Chicago, ill. Tell me how to set rid of body capacity in the Flewelling set. It is something awful. I have shielded the panel and grounded the shield and, while 1 get some relief, it is still bad. While sitting at the instrument things go along well. If I get up on my feet the music is gone and it takes about one minute while standing before it comes in full tone again or if 1 split my head piece and give one of the phones to my wife I retaining the head piece, it deadens the sound the moment she handles it. Why cant I get out-of-town signals? I can only use 21 to 45 volts on the plate, more than that seems to deaden the sound. I am using a peanut tube and I notice one newspaper says as a detector use only 20 and one or two amplifying stages use not more than 45 volts. Why? Will it kill the tube or shorten its life? Can I use 20 volts on detector and 45 volts on a one or two step and will I get better results? I cannot receive unless I use antenna. My antenna is 100 ft. two wires, 50 each, and about 50 ft. drop to second floor, or 160 ft. in all. Please tell me about body capacity and voltage on plate using peanut tube. The newspaper says do not use in super circuit. When it comes to going from KYW to WDAP or between any other local broadcasting outfit the Flivver can't be beat. A. — Answering your inquiry with reference of Flewelling circuit will advise that the bugbear of body capacity effect which is so pronounced in this, as in all superregenerative circuits, is engaging the attention of our experts towards a reduction if not a complete elimination. As soon as developments are perfected our readers will promptly be apprised of findings in the matter. Excessive voltage will shorten the life of the tube of course, but in the case of a WD-11 tube that would mean about one hundred and fifty volts. Tou can with perfect assurance use sixty-five volts on the plate of a WD-11 tube. Tou can use 20 volts on detector and 45 on a one or two step, as suggested, although we would advise high plate potential on all tubes in the Flewelling circuit. WD-11 tubes will function satisfactorily in a super-regenerative circuit. Tour antenna construction of two 50 $1 $1 $1 $1 $1 $1 $1 $1 $1 $1 Book of Hook-Ups REINARTZ FLEWELLING REFLEX many others, simple and elaborate, fully diagrammed and explained. Used continuously by thousands of Radio fans, both amateurs and professionals. The greatest book ever published for experimenting. Keep this valuable little book before you at all times. Send your check or money-order for one dollar and the book will be mailed to you. Fifty hookups in the book— all different. Send your order today. The edition is limited. BOOK OF HOOK-UPS, $1.00 ELS RADIO COMPANY Randolph Building CHICAGO, ILL. $1 $1 $1 $1 $1 $1 $1 $1 $1 $1 Coekaday Circuit Complete Parts— CIA CA Regular Value, $26.06 ^>-l"**»OU Dx-Flex Circuit Complete Part*— CI 7 f|A Regular Value, $28.00 V* ' • W Reinartz coils $1.75 Coils for Greene circuit 35 DX Couplers 1.65 43 Plate Vernier 3.75 23 Plate Vernier 3.25 $6.00 Diamond Head Set, 2000 ohm 3.00 Mail Orders Promptly Filled WILLIAMSBURG RADIO SUPPLY CO., INC. Manufacturers and Jobbers of RADIO SUPPLIES 801 Flushing Avenue, Brooklyn, N. Y. The Radio Digest Q. & A. Department does not consider it ethical to divulge circuits of manufactured sets. We request that all such inquiries be mailed to the manufacturers. foot wires does not constitute 100 feet. That must be accomplished in each wire, including lead-in. A single wire of that length is an ideal antenna construction, generally speaking. Charging' Batteries (3636) DBS, Crawfordsville, Ind. Please tell me how to make a rectifier out of a pair of 1,000-ohm telephone ringers. I understand this can be done. If a transformer is used, please tell me what kind. IIO VOLTS A.C. TRANSFORMER 30 VOLTS I ALUMINUM LEAD-" 73} —Si STORAGE BATTERY A. — Experience shows it impractical to make a rectifier from a 1,000-ohm telephone ringer. Theoretically it would work out by connecting the coils to the A. C. current and arranging contacts for the clapper to strike. In practice it will be found that the ringer will stick because the armature is too heavy to keep in step with the alternations of the A. C. The majority of telephone ringers are tuned to work on about 40 cycles. Hence, 60-cycle current is a little too fast for them. As a rule the electrolytic rectifier is more practical for home construction, and if not pushed too hard will prove very satisfactory. A very good arrangement is shown in the accompanying illustration, using a transformer to step down the current to 30 volts. A simple rectifier cell can be made by placing an aluminum and a lead plate in a jar large enough to hold two quarts of water. The solution consists of four tablespoonfuls of baking soda and two tablespoonfuls of vinegar and sufficient water to nearly fill the jar. Connect the rectifier cell in series with the transformer secondary and the battery, the lead plate being connected to the negative lead of the battery. This rectifier will pass four or five amperes, depending on the size of the plates, and keep a battery well charged up. A transformer rated at from 100 to 150 watts should be employed. Bemagnetizingr Phones (2381) WG, Detroit, Mich. I have a pair of phones of a good make but the magnets are getting very weak with resultant loss of audibility. Can you please tell me if I can remagnetize them myself and how? A— Answering your inquiry with reference to remagnetizing phones, — it is, in our opinion, doubtful if you could accomplish it practically. New magnets can V.T.1-W.D.11-12-V.T.2 U.V. 200-201-201 A ALL THESE POPULAR TUBES REPAIRED AT $3.00 EACH IN STOCK TESTED AND GUARANTEED R.V.T. 6 Volt Amplifiers $2.00 R.V.T. 6 Volt Detectors 2.00 T.V.T. 1% Volt Ampl. or Det. 4.00 Postage and Insurance, 15 Cents TRY US AND SAVE MONEY All Our Tubes Have Standard Bases SLAPP TUBE EXCHANGE Suite 616, 132 Nassau Street, New York City Base (T REFLEX Erla Reflex Transformers DEALERS: SEND FOR LITERATURE ** iHMM.'Hrl'W 123 W. M ad iron Si, Chicago be secured from manufacturer at a reasonable cost and they may be substituted for the present ones. This would be much the better method. Windmill Tower Aerial (3446) JAK, Paxton, 111. Is it advisable to attach a 120-foot single wire aerial to the top of a 35-foot steel windmill tower? Wire would run northeast and southwest, the southwest end running to the house. If so, how far away should the aerial proper commence? Would placing a long style insulator in the wire running from the tower to the end of the aerial do any good? Is it necessary to have both ends of the aerial the same height from the ground? A. — Answering your several inquiries, would advise as follows: Construction of aerial from steel tower, as suggested, is all right if wire is properly insulated from the tower. The aerial proper may begin at about three feet from the tower. An incline in aerial will be all right, however; the highest end should be furthest from receiving apparatus for best results. Any standard insulator will serve effectively. Aerial Masts (3477) CWH, Cedar Rapids, la. Kindly give me a little information through your Questions and Answers column when convenient. I have two steel masts and eight guy wires on each. None of these are insulated. Should they be insulated? A. — Answering your inquiry, we are advising that masts used in antenna eon-v struction are not necessarily insulated unless used for a transmitting circuit. SOMETHING NEW A real loud Talking Detector made of "B" Metal. 100% , superior to any crystal. I Puts new life into! your set.' Guaranteed for one year. It's the cheapest in the long run. Sold by all live dealers, or can be ordered from the B-Metal Refining Co. 3134 Trumbull Ave. Detroit, Mich. THE BOOK WITH THE BLUE COVER, FOURTH EDITION Type NEW CONSTRUCTION of an FRESHMAN Variable Resistance Leaks guarantees long life and permanent resist ance — no pencil markings — assures an un broken range of 180 degrees. Eliminate hissing. Clarifies signals. : /0' , * -#CV '""~ "£7 L IfHASfp |fl£6fc>0RK -P-T 1A! ItiS A New Leak for PANEL MOUNTING Mounted on any panel in a few seconds — 2 mounting screws serving as connections behind the panel. Complete with Either .00025 or .0005 Mfd. Micon Condenser $1.00 Without 7 tte» Condenser • ***» A necessary essential for every tube receiving set At your dealers — otherwise send purchase price and you will be supplied postpaid. Also ask your dealer for our free diagram of the Kaufman and Flewelling Circuits. resnmanfo.lnc. Condenser z&cducts 106 Seventh Avenue New York City AT YOUR DEALER, OR DIRECT —mm