The main characteristics of the input circuit of receiving devices

Input circuit transfer factors:

              a) voltage:

Where - the voltage at the input of the first amplifier-converter cascade of the receiver;

              - EMF of the signal generator equivalent to the antenna-feeder system;

              b) by power:

Selectivity:

Selective properties of the input circuit are estimated by the selectivity characteristic

Where - the transfer coefficient of the input circuit at the resonant frequency;

              - transmission coefficient at a given current frequency.

Bandwidth consistent with the width of the spectrum of the useful signal.

Overlap of the required frequency range.

Breakdown into subranges is carried out in two ways:

but)  

b)

Stability of parameters and characteristics.