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35 mm film adjustment amplification factor amplitude characteristic antenna temperature antenna terminals aperture efficiency attenuation band-pass curve band-pass filter block diagram calibration cathode-ray tube channel bandwidth circular polarization DC logarithmic amplifier differentiation diode switches display system dynamic range dynamic spectrograms electronic scanner emission equal figure film frequency band frequency coverage frequency drift grey-scale Groot high-frequency input voltage insertion loss integrating time constant interference interfering signal large number logarithmic characteristic measured multi-channel NERA noise factor obtained output amplifiers output voltage pass band period t0 polarization output pre-detection bandwidth quadratic detector quantitative quiet sun r.m.s. deviation Radio Kootwijk radio spectrograph receiver input receiver noise reflector relative threshold sensitivity resistor respect signal integrator signal level slowly varying solar flux solar radio spurious responses stability strong signals strong-signal output total power Tsys tuned type I bursts VSWR W/Hz waveform weak-signal outputs wordt zero level zero-correcting circuit zijn