GEAR MEASURING DAMPING FACTOR BETWEEN ANTENNAS Russian patent published in 1999 - IPC

FIELD: measurement technology. SUBSTANCE: automatic measurement of damping factor between antennas is provided in gear by setting of digital code with use of former 1, reversible counter 2, digital-to-analog converter 3, controlled attenuator 4, first electronically controlled switch 22, transmitting antenna 24, receiving antenna 25 and second electronically controlled switch 23 across input of instrument receiver 5 of level of signal equal to its sensitivity, by measurement of level of power Pt across output of controlled attenuator 4 with level of input signal across input of instrument receiver 5 equal to its sensitivity, by memorization by first storage 21.1 of value of power Pt by way of setting level of signal across input of instrument receiver 5 also equal to its sensitivity with the aid of units 1, 2, 3, 4, 22 and 23, by measurement of level of power Phf across output of controlled attenuator 4 with level of input signal of instrument receiver 5 equal to its sensitivity, by memorization of level of power Phf by second storage 22.1, by division of Pt/Phf by digital divider 18, by taking logarithm of division result of Pt/Phf in logarithmic unit 15 and by display of numerical value corresponding to damping factor between antennas on digital signboard of indicator 10. EFFECT: increased measurement accuracy. 2 dwg