As you can see from the entry in the aircraft.cfg for my 707-300:

[Radios]
Audio.1=1
Com.1=1, 0
Com.2=1, 0
Nav.1=1, 0, 1
Nav.2=1, 0, 0
Adf.1=1, 0
Adf.2=1, 0
Transponder.1=1
Marker.1=1

and the entry in the aircraft.cfg for my 737-200:

[Radios]
// Radio Type = availiable, standby frequency, has glide slope
Audio.1= 1
Com.1         = 1, 0
Com.2         = 1, 0
Nav.1         = 1, 0, 1
Nav.2         = 1, 0, 0
Adf.1= 1
Adf.2= 1
Transponder.1 = 1
Marker.1= 1

that that is the way they are set by default. So mine have always been like that. Yours should have been the same. :-/