A project to improve the sensitivity and the phase stability of the lambda 8-cm radioheliograph at Toyokawa

Details A project to improve the sensitivity and the phase stability of the lambda 8-cm radioheliograph at Toyokawa A project to improve the sensitivity and the phase stability of the lambda 8-cm radioheliograph at Toyokawa

Mar 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979prian..26..145i&link_type=abstract

Nagoya University, Research Institute of Atmospherics, Proceedings, vol. 26, Mar. 1979, p. 145-150. Ministry of Education

Computer Science

1

Centimeter Waves, Data Acquisition, Solar Radio Emission, Spectroheliographs, Systems Engineering, Instrument Errors, Phase Error, Radio Antennas, Sensitivity, Transmission Lines

Scientific paper

An improvement of the present system is suggested by replacing its waveguide network with a combination of low noise, phase stable front ends, and low loss, phase stable coaxial cables to transmit signals from and to the front ends. The temperature inside the front end box is kept within 0.1 C deg accuracy to achieve the required phase stability. It is recommended to use a higher frequency as a reference signal to minimize a phase error. Attention is given to the reference signal cables rather than IF return cables. A polyethylene coaxial cable is used as the transmission line to improve phase stability. At the second IF stage, the transmission loss and front end gain for each channel are equalized by computer controlled digital phase shifters. Each channel can be operated as an independent radiometer to achieve the better calibration of total errors in gain and phase.

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