a) a central processing unit (CPU);

b) N dual mode modules (N>2) for spectrum analysis and band rejection (SABR), each SABR module receiving a digital quadrature signal input, outputting a spectral data output to the CPU through an interface, and then outputting a quadrature output with interference band rejected,

wherein the CPU controls the SABR modules parameters and operation mode to first place the SABR modules into a spectral analysis (SA) mode, and upon detection of interference, then to place at least one of the SABR modules into a band rejection (BR) mode for as long as the interference continues;

c) N N-to-1 multiplexers, whose quadrature outputs are connected to quadrature signal inputs of the corresponding SABR modules,

wherein the multiplexers have a control input from the CPU, wherein the control input controls whether to connect an input of each multiplexer either to the digital quadrature signal input or to a quadrature band-reject output of any other SABR module;

d) a (N+1)-to-1 multiplexer controlled by the CPU, through which it can be connected to a quadrature signal input or to a quadrature output of any SABR module;

e) a frequency conversion (FC) module, that receives as input a quadrature output of the (N+1)-to-1 multiplexer and whose output is a filtered quadrature output of the AJ apparatus,

wherein the FC module is controlled by the CPU and executes up/down frequency conversion of a spectrum of the digital quadrature signal input.