Problems and technical aspects of creation of devices for the control and measuring parameters of wireless systems

摘要

The basic problems and problems of technical realization of the universal multipurpose device — a radio tester are considered. Experimental researches of a breadboard model of a radio tester have shown that for expansion of a dynamic range of the receiver and reception of phase noise a heterodyne at 100dB/Hz level on distance 10 KHz from carrier frequency use of two-loopback system PLL is necessary. In a digital part of a radio tester a quadrature demodulator on digital receiver AD6655 is used for digital filtration in a range of frequencies from 20 MHz to 1MHz with signal suppression in Nyquist strip to 100 dB.