Radio broadcast .. (1922-30)

What Our Readers Write Us A Spare-Parts One-Tube Reflex AH IS LETTER — one of a great number inspired by the article on the onetube reflex receiver in our November number — is of particular interest because it shows how wide are the bounds within which one can build a given set successfully, provided the circuit is correct. This does not mean that hit-or-miss work will result in satisfaction. If one is to make substitutions, he must know what to substitute. A knowledge of the fundamentals makes the going much easier than trying to follow a circuit and description without a single deviation. .If you know what the circuit should be like, it ought to be easy to use some of the material you have on hand, as Mr. Fern has done. Editor, RADIO BROADCAST Doubled ay, Page & Co., Garden City, L. I. DEAR SIR: This letter is written as an expression of the appreciation felt as a result of the remarkable performance of the "Reflex Knock-out" described in the November issue of your magazine. I have already succeeded in getting stations on either coast, and most of the intermediate broadcasting stations. These results are all the more remarkable in that I made use of odds and ends about the laboratory. For example: pasteboard forms No. 27 S. C. C. wire and celluloid for a dielectric (from a Ford side-curtain) were used in the coils, and vernier condensers and a Bradleystat were used in place of the equipment specified. Please accept my thanks for making public this circuit, whjcb is the first in my experience to do more than is claimed for it. Very truly yours, J. G. FERN Hammond, Ind. A Duplicate of the Prize-Winning Tube Set THE letter printed below is from the winner of the RADIO BROADCAST prize contest held to "determine who has done the best work with any kind of receiver and any number of tubes. " The results were printed in our August, 1923, number. The prize was a De Forest D-io Reflex set. It is interesting to know that the writer has tested another edition of his set with so much success. Mr. Bartholomew has furnished us with complete verification of the program from KHJ he heard on the night of October 23rd. Editor, RADIO BROADCAST Doubleday, Page & Co., Garden City, L. I. DEAR SIR: First let me thank you for the D-io set and say that it is some machine. My wife has laid claim to it and taken it to Connecticut with her. I also thought that you might be interested in the fact that I am now making, or rather have made, a machine trying as far as possible to duplicate mine. This machine is for Dr. W. C. Wolverton of Linton, N. D. My purpose is to see if it is the machine that is good, or the location, and I want it tried out well in the States. Now I know it is possible to duplicate the machine and have it work about the same, for last night I made my first real test with the following results: WLW, WGY, WDAF, KSD, KDKA, WHB, WSB, WBAP, WJAX, WEAF, WIP, and WMC and KHJ in Los Angeles. KHJ, I picked up at 11:55 our time, and held until I stopped working at 12:30. 1 will enclose a summary of what I heard from them in case you want to check them. I am doing this because I received a few rather questioning letters from the article in the October issue of RADIO BROADCAST and want you at least to feel that I was not stretching it a point. Sincerely, R. Bartholomew Garrochales, P. R. When Will Sets Be Sold Really "Complete?" "T^LENTY of letters have come in to our 1 office complaining that radio dealers do not quote complete prices to prospective buyers. The set will be "complete," but strangely lacking in tubes, or batteries, or something. There are probably many prospective purchasers, knowing very little of radio, who want a