DocumentCode :
976172
Title :
Automatic Sweep-Frequency Ionosphere Recorder, Model C-4
Author :
Brown, J.N.
Author_Institution :
Appl. Sci. Corp. of Princeton, Princeton, N.J.
Volume :
47
Issue :
2
fYear :
1959
Firstpage :
296
Lastpage :
300
Abstract :
An improved sweep-frequency ionosphere recorder was needed to carry out the expanded program of observation planned for the IGY. The resulting equipment included improvements in output power, receiver sensitivity, purity of output signal, and other details, over earlier equipments. The basic principles of operation are described and the transceiver-type of circuitry explained. The operating characteristics are: frequency range, 1-25 mc; output power, 10-30 kw peak pulse power; pulse length, 50 ¿sec; repetition rate, variable from 10-70 pulses per second. An elaborate control and programming system is provided which can be used to operate the equipment on an unattended automatic basis. The "virtual height" of the ionospheric layers, as a function of frequency, is recorded on photographic film by two cameras¿a 35-mm uniformlymoving-film unit, and a frame-by-frame 16-mm camera, which produces time-lapse motion pictures of the changes which occur. A brief history of the development of the sweep-frequency recorder technique is given.
Keywords :
Automatic control; Automatic programming; Cameras; Circuits; Control systems; Frequency; History; Ionosphere; Motion pictures; Power generation;
fLanguage :
English
Journal_Title :
Proceedings of the IRE
Publisher :
ieee
ISSN :
0096-8390
Type :
jour
DOI :
10.1109/JRPROC.1959.287297
Filename :
4065671
Link To Document :
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