this is how to reproduce
radio assist : off
easy communication : off
mission : shooting gallery (or else)
from the manual : This radio operates like Radio 1, but is assigned the VHF FM radio frequency range. The VHF/FM operates between 30.000 and 76.000 MHz. If the radio is tuned to a frequency outside the valid range, a warning tone will be heard.
but plz try this procedure yourself
turn 1st FM frequency knob from default 3 > left click 15(beep! : no problem) > 3(still beep! at 30Mhz : bug)
but when you try again like this 3 > right click 4 > 3 (no beep! at 30Mhz : normal)
and also, JTAC never works in this mission...
whole radio system of dcs a-10c pretty messed up in 1.2.6 and seems not a minor bug
(with AM radio 150Mhz warning tone issue, JTAC and Air to Air Refueling rarely work properly...etc.)
plz fix this or at least give me a workaround
cheers