Radio Broadcast (May-Oct 1925)

Record Details:

Title:
Radio Broadcast
Date:
May-Oct 1925
Publisher:
Garden City, N.Y., Doubleday, Page & company [etc.]
Volume:
Radio broadcast ..
Leaf #:
00057
Language:
English
Subjects:
radio periodical, Radio -- Periodicals
Contributor:
Library of Congress, MBRS, Recorded Sound Section
Sponsor:
Library of Congress, Motion Picture, Broadcasting and Recorded Sound Division
Coordinator:
Media History Digital Library
Description:
Radio Broadcast supported home listeners of the new technology of radio – for building or buying a receiving set to explaining the technology used by the new radio stations. Throughout the magazine shows the cultural influence of radio as it evolved from hobbyist to mainstream. -- David Pierce, 2011
Date Added:
September 29, 2022
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Radio Broadcast Photograph OVER THE TOP A layout view showing the actual scarcity of wiring. The angle of placement of the coils is clearly indicated How to Build a Two-Stage RadioFrequency Amplifier By JOHN B. BRENNAN HpHE amplifier described in this article incorporates some new and desirable ideas * in construction. Leads have been reduced to the shortest possible length, the famous Roberts system of double-wound coils has been used for the neutralization of each stage, and the especially efficient diamond weave coils employed for the transformers. This unit is simply a radio-frequency amplifier which can be connected to any detector. A later article will describe a detector and audiofrequency amplifier which may be used with it. In these days of high power broadcast stations, the selectivity gained by the use of radio frequency amplification is especially desirable. By completely neutralizing both stages of this amplifier, the full gain from each tube is secured. The simplicity of design and the ease of construction of this unit, in addition to its important feature of non-radiation, should appeal to every constructor. — The Editor BEFORE dealing with the construction of a radio-frequency amplifier it is well to understand just what radio frequency energy is and how it may be amplified. The signal radiated by a broadcast station is composed of many electromagnetic vibrations or alternations. Due to many causes, such as the power of the transmitting station, absorption losses, location of the receiver, etc., these impulses which are collected by the receiving antenna may be too feeble to actuate the detector tube. When this is the case, little or no rectification in the detector tube takes place, making it impossible for the signal to be heard. To state the case simply, the detector tube performs the function of rectifying and making audible the very high or radio frequencies which cannot be sensed by the ear. This tube, so to speak, transforms or lowers the radio-frequency currents to an audible or audio-frequency current. The vacuum tube can function as an amplifier (or repeater,) and it is possible to strengthen the amplitude of the very feeble received signal from the antenna, by means of