It was similar to a Morse code sound transmitting “i i i i i i i…” (dot dot pause dot dot pause dot dot pause … at a rate of maybe two “i” per second. (It’s been a lot of decades since I tried to learn Morse Code)
So far this morning I have not found any way to activate an ELT, VOR, or NDB. I still need to spend time looking at DBM 930 information. I think I just pressed everything on the plane while sitting on the ground and could not find those things or duplicate the sound.
Actually, it had an RF like tone.