Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986ijimw...7...43b&link_type=abstract
International Journal of Infrared and Millimeter Waves (ISSN 0195-9271), vol. 7, Jan. 1986, p. 43-63.
Astronomy and Astrophysics
Astronomy
4
Gunn Effect, Microwave Oscillators, Millimeter Waves, Phase Locked Systems, Radio Astronomy, Radio Spectroscopy, Error Signals, Molecular Rotation, Servoamplifiers, Switching, Transient Response
Scientific paper
A frequency-agile heterodyne phaselock loop (PLL) system for millimeter-wave Gunn-effect oscillators between 40 and 110 GHz is described. The Gunn oscillators are phase-locked via the bias in an active second-order servo loop. A facility for fast frequency switching with a maximum rate of 10 kHz and a frequency separation up to 80 MHz is provided. Measurements on the spectral characteristics of a phase-locked Gunn oscillator are presented. The described PLL system is used in radio astronomy and laboratory molecular spectroscopy.
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