1、CCIR RECMN*852 92 4855212 O520296 436 Rec. 852 RECOMMENDATION 852 SENSITMT OF RADIO RECEIVERS FOR CLASS OF EMISSIONS F3E (Question 44/1) 1 1992) The CCIR, considering a) system planning and operation; that knowledge of the performance in terms of sensitivity and selectivity of a receiver is required
2、, both in b) cl that it would be important to have a single system performance measure; and that the method used to obtain the reference output for sensitivity and selectivity of a receiver is: - the “SINAD method”, which uses the ratio (Signal + Noise + Distortion)/(Noise + Distortion) (SND/ND) as
3、a reference magnitude of receiver performance. The value of both the numerator (SND) and the denominator (ND) is determined in the presence of modulation. The desired signal (5) is removed in the denominator by means of a distortion analyzer notch fdter, recommends 1. emission F3E for use in the lan
4、d and maritime mobile services: that the SINAD method given in 0 c) should be used to measure the sensitivity of receivers for class of 2. that the sensitivity of the receivers should be the input signai level that gives: SND/ND (or SINAD) = 12 dB measured in the presence of modulation with a test signai rejection frlter.
