Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976rsci...47.1020h&link_type=abstract
Review of Scientific Instruments, vol. 47, Sept. 1976, p. 1020-1025.
Astronomy and Astrophysics
Astronomy
18
Frequency Stability, Frequency Synthesizers, Klystrons, Millimeter Waves, Phase Locked Systems, Automatic Frequency Control, Error Signals, Feedback Control, Harmonic Oscillators, Microwave Frequencies, Radio Astronomy, Other Topics In Electronics, Radiowave And Microwave Technology, And Direct Energy Conversion And Storage
Scientific paper
A frequency-agile phase locked system which locks a millimeter-wave klystron to a reference tone derived from a frequency synthesizer is described. The system, designed for use in millimeter-wave molecular astronomy, uses two feedback paths to control the klystron. An AFC loop using a discriminator brings the klystron frequency close to the desired value, and then a second order phase locked loop pulls in the klystron and locks it to the reference signal. By programming the synthesizer, the klystron can be stepped through any sequence of frequencies lying within a band roughly 200 MHz wide.
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