From what I can tell, they have added additional gain to the microphone input circuit (as compared to the 756. Apparently ICOM has been influenced by this issue since I found that I could drive the PRO with a dynamic element. Scope system : FFT (Fast Fourier Transform) When I decided to get an IC-756PRO, I assumed that it would have the same input characteristics. This modification allows transmitter to transmit on whole frequency range. Transmitter is factory limited to transmit on amateurs bands only. It can receive from 30 kHz up to 60 MHz continuously and transmit all mode, all bands with 100 watts RF power output. A second touch of the scope screen changes the operating frequency and allows you to accurately tune. ICOM IC-756 Pro2 is popular HF+6m band transceiver. So, when you first touch the scope screen around the intended signal, the touched part is magnified. The ‘7300’s touch screen introduces a “Magnify” function. You no longer have to choose whether to listen to the audio or have the spectrum scope sweep for signals as the IC-7300’s real-time spectrum scope offers the simultaneous operations found in some of the more expensive rigs! This means you can use either the spectrum scope or the waterfall to quickly move to an intended signal while listening to the receiver audio. Image below shows the Audio scope with the waterfall function and the oscilloscope.
Use the audio scope function to observe various AF TX/RX characteristics such as microphone compressor level, filter width, notch filter width and keying waveform in the CW mode. Like on the high-end rigs, the waterfall shows a change of signal strength over a period of time and allows you to find weak signals that may not be apparent on the spectrum scope.
The large 4.3” color TFT touch LCD offers intuitive operation of functions, settings, and various operational visual aids such as the band scope, waterfall function, and audio scope.