I've seen that, too, and I remembered it being like that the last time I played. However, with the newest version, there is no knob to adjust the frequency; instead, you have options for either the dealer, bunker code, or raiders.
From the recent videos I've seen about raiders, players get this third option after getting to level 150 to contact the raiders. After pressing it, the frequency is tuned to their frequency. My problems are that I can't tune the frequency myself, and the option to contact the raiders hasn't appeared. ( Even after constantly checking it for multiple hours during the same session, I'm sure I couldn't have missed it. ) After multiple days of this, I just assumed it was because of the tweak and some mistake I made using it ( Maybe from messing with the settlement stuff? I never ended up crashing or not being able to load in but it may have caused my account to be compromised. )