The FT-991 is an traditional superheterodine quadri-bands! The new IC-7300 adopt the latest RF direct sampling method (BPF >A/D >FPGA >DSP >D/A – see the Icom block-diagram below) and it is equipped with a high-performance real-time band scope on large TFT display!
RF Direct Sampling System — A First in Amateur Radio*
Instead of the conventional superheterodyne system, the IC-7300 utilizes the RF direct sampling system — a first in an amateur radio transceiver. This technology is seen in Software Defined Radios and other radio equipment. RF signals are mostly processed through the FPGA (Field-Programmable GRate Array), making it possible to eliminate physical mixer and filter devices and offer a high performance real-time spectrum scope in a compact body. * Researched by Icom, among major amateur radio manufactures.
