The book of radio; a complete, simple explanation of radio reception and transmission, including the outstanding features of radio service to the public by private and government agencies (1922)

Record Details:

Title:
The book of radio; a complete, simple explanation of radio reception and transmission, including the outstanding features of radio service to the public by private and government agencies
Date:
1922
Publisher:
New York, London, D. Appleton and company
Volume:
The book of radio; a complete, simple explanation of radio reception and transmission, including the outstanding features of radio service to the public by private and government agencies
Leaf #:
000353
Language:
English
Collection:
Books
Format:
Books
Contributor:
Cornell University Library
Sponsor:
MSN
Coordinator:
Media History Digital Library
Description:
Date Added:
July 19, 2022
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314 THE BOOK OF RADIO The reader who has heard the loud crashing of a small 1 kilowatt spark transmitter on board a ship, no doubt would expect to be greeted with an almost deafening roar as 200 kilowatts of energy were hurled into the massive antenna and thence across the seas. This is not the case at Radio Central; merely the steady hum of the generator such as can be heard at any lighting power station. First appearances strike one as being common- place and uninteresting. No undue noise, no excite- ment, nothing dramatic; surely this cannot be the trans- mitter of the greatest wireless station in the world! This quiet, businesslike way of doing miraculous things, soon becomes a source of wonderment and admiration in it- self. It is the characteristic way that the Radio Cor- poration has of doing things. The Big Alternators.—The first objects that attract attention are the two 200 kilowatt, high-frequency Alexanderson alternators (see Fig. 173), which make this whole system of trans-Atlantic radio telegraphy possible. One is in operation, and the other is held in reserve for the second antenna now nearing completion. These generators produce 100 amperes of current at 2,000 volts, with a frequency of 18,000 cycles. From the generator, the current goes into a high-frequency air core transformer where the voltage is stepped up to 7,000 volts. From here, the current is led out of the power house to an immense helix or tuning coil (see Fig. 174), to which is attached the lead-in of the an- tenna. At the second, third, fourth, fifth, and sixth towers, leads are taken from the antenna and led to the ground through similar tuning coils. Such an