Abstract: SAW chirp z transform processors are widely accepted as a promising supporting technique for real time Fourier transform signal processing It has come into use since the end of 1970's. In this paper a practical SAW CZT spectrum analyzer with a broadband and a high frequency re-solution designed for use in radio astronomy is discussed. It's performances and specifications tested under laboratory conditions as well as a method to extend the duty cycle of SAW CZT processor from 50% to 100% are presented.