Practical wireless telegraphy; a complete text book for students of radio communication (1917)
Bucher, Elmer Eustice, 1885- · New York, Wireless Press, Inc · leaf 288
described asfollows: The Poulsentikker interrupts the cir-cuits of the receivingtuner at a uniform rateper second {approxi-mately 300 to 600 times) ;the heterodyne system isbased upon the interac-tion of two radio-fre-quent currents in thereceiving aerial, resultingin the production of… … PHONES Fig. 289.—^The Simple Poulsen Tikker and Circuit. 278 PRACTICAL WIRELESS TELEGRAPHY. the vacuum valve as an oscillator at radio-frequencies to produce the heterodyne effect.This, combined with the well-known relaying action of the vacuum valve and its abiUty torepeat currents of…
Telegraph, Wireless
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