NDLI: Production of single sideband for trans-Atlantic radio telephony

Content Provider	IEEE Xplore Digital Library
Author	Heising, R.A.
Copyright Year	1963
Description	This paper describes in detail the equipment and circuit used in the production of the single sideband for trans-Atlantic radio telephony in the experiments at Rocky Point. The set consists of two oscillators, two sets of modulators, two filters, and a three-stage amplifier. The oscillators and modulators operate at power levels similar to those in high-frequency communication on land wires. The three-stage amplifier amplifies the sideband produced by these modulators to about a 500-W level for delivery to the water-cooled tube amplifiers. The first oscillator operates at about 33700 cycles, The modulator is balanced to eliminate the carrier; and the first filter selects the lower sideband In these trans-Atlantic experiments the second oscillator operated at 89200 cycles, but might operate anywhere between 74000 and 102000 cycles. The second modulator, which is also balanced, is supplied with a carrier by the second oscillator and with modulating currents by the first modulator and first filter. The second filter is built to transmit between 41000 and 71000 cycles, so that by varying the second oscillator the resulting sideband, which is the lower sideband produced in the second modulating process, may be placed anywhere between these two figures. Transmission curves for the filters are given as well as some amplitude-frequency performance curves of the set.
Sponsorship	IEEE Publication
Starting Page	752
Ending Page	761
Page Count	10
File Size	222718
File Format	PDF
ISSN	00189219
Volume Number	85
Issue Number	5
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1997-05-01
Publisher Place	U.S.A.
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Production Telephony Oscillators Filters Wires Testing Telegraphy Speech analysis Frequency conversion Circuits
Content Type	Text
Resource Type	Article
Subject	Computer Science Electrical and Electronic Engineering

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