The audio mixer is connected as follow
Input no1 ... (Microphone) is ACC1-pin5(audio) of IC7851
Input no2 .............. (Line input) is speaker-out1 of IC7851
Input no3 ........................................ (USB) is PC(windows)
Input no4 ................................................ (AUX) is Auxiliary
Output no1 ................... is audio power amp and speaker
Output no2 .................................................. is head phone
Output no3 ...............................................(AUX) is Auxiliary
There fore, it makes many conveniences as follow
No.1 : ................................. no need for headphone to be reconnected to RIG or PC
No.2 : .................................. its possible for receiving audio only to be much louder
without CW side tone level louder
much advantage for quite weak signal
No.3 : Original ICOM AF-amp and SP-34 speaker audio is broken when much loud
big power audio amp and big power speaker make the problems clear
No.4 : .................................... AG03 is possible to output through USB to computer
so that audio of Kiwi-SDR is loopback to the windows myself
into MixW to decode. big bonus!
end