Radio broadcast .. (1922-30)

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How to Build a Neutrodyne Receiver 125 jority must build, or would rather build, their own. In past years, before radio came into people's homes, a man would build a mission table, a sled for the kiddies, or possibly a model engine; and, after planning for days, what a thrill he would get when the thing was actually finished and made to "work" or serve some useful purpose! Where in the world is there anything that can compare, in giving to such people more thrills and pleasures, with the everyday use of a radio receiver, built by their own hands, that works? To give radio experimenters dependable, authorized constructional information concerning the neutrodyne circuit receiver is the purpose of this article. In March of this year, Professor Hazeltine revealed his developed work and introduced the neutrodyne circuit radio receiver. About July of this year, a limited number of companies licensed under Professor Hazeltine's patents were building completed receivers, utilizing the neutrodyne principle and in addition were supplying complete sets of parts suitable for neutrodyne-receiver construction. Being in intimate touch with many people who have built neutrodyne-circuit receivers using such parts, I can assure you that to build such a receiver calls for reasonable care in construction in order to obtain maximum broadcast signal reception, but for thousands who would be painstaking, the results in the end certainly justify the expense and the pains necessary. LIST OF MATERIALS NECESSARY TO CONSTRUCT A FIVE-TUBE NEUTRODYNE-CIRCUIT RECEIVER THE five-tube neutrodyne-circuit receiver to be described gives two stages of tuned radio-frequency amplification, a vacuum-tube detector and two stages of audio-frequency amplification. Such a receiver will cost approximately $65.00 for parts, and if one purchases all the additional equipment, the total cost will be approximately $150.00, including the five vacuum tubes, storage battery, B battery, phones, and antenna material. The following list of materials must be acquired: APPROXIMATE PRICES i Panel, bakelite, 26" x 7" x •&" , drilled, machined, and engraved $ 8.00 i Base board, oak, 26" x 6" x f" i.oo