Look In the cfg file for a section called [RADIOS]
You should find the following lines
\\ radio available,Stanby freq,Has glide slope
com1=1,1,0
com2=1,1,0
nav1=1,1,1
nav2=1,1,0
adf=1,0,0
transponder=1
marker=1
A 1 means on a 0 means off
You can always compare to a default air plane.
Not all radios have a secondary standby freq The Lear 45 is an example so you would have to turn the standby off.
I have seen many a radio panel that in order to change the active freq you have to click on the standby freq. That is caused by a wrong entry in the Nav1 & Nav2 lines. You will probaly see a line like NAV1=1,0,1
Notice the second entry is 0 that means no stanby freq.
so you will not be able to change it and switch over as you should be able to.
