Computer Science
Scientific paper
May 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984rpeee....q...5g&link_type=abstract
In its USSR Rept.: Electron. and Elec. Eng. (JPRS-UEE-84-007) p 5 (SEE N84-26821 17-31) Transl. into ENGLISH from Izv. Vyssh.
Computer Science
Frequency Stability, Heterodyning, Phase Locked Systems, Radio Telescopes, Bandpass Filters, Feedback Control, Field Effect Transistors, Low Pass Filters, Millimeter Waves, Spectroscopy
Scientific paper
A heterodyning system was developed for a RT-22 radio telescope. The principal components are a Ch6-31 frequency synthesizer acting as local oscillator with frequency tuning, its frequency instability not exceeding .003 over a period of 0.2 s, followed by a phase filter. The latter consists of a low noise (-94 dB/kHz) tunable (22.5 to 24 MHz) oscillator built with a field effect transistor, a phase detector, a d.c. amplifier, and a low pass filter. The system is provided with automatic phase lock frequency control (35 to 37 GHz) and automatic frequency lock frequency control (22 to 23 GHz), each through an appropriate feedback loop, operating each alone or both together. In the latter case the outputs from the phase detector and the frequency detector are added with weight factors in the d.c. amplifier.
Gusev Andrey V.
Sorochenko Roman Leonidovich
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