Hi!
Open in favourite texteditor (wordpad, notepad, etc) the embraer 170 aircraft.cfg file, and insert next lines. Hope usefill hints added.
[Radios]
// Radio Type = availiable, standby frequency, has glide slope
Audio.1 = 1
Com.1 = 1, 1
Com.2 = 1, 1
Nav.1 = 1, 1, 1
Nav.2 = 1, 1, 0
Adf.1 = 1
Transponder.1 = 1
Marker.1 = 1