[R-390] R-392 bandwidth question

[Robert Newberry]

I was listening to the gang on 3.875 on my 392. Conditions were crowded
with SSB above and below the QSO. I thought tightening up my bandwidth
would help.

I switched to 4kc and it was like engaging squelch I could see signal
strength but I had barely detectable audio. I engaged the BFO and adjusted
my tuning and was able to copy the QSO. I know this rig sounds great
listening to AM shortwave.

Question is did I do the correct thing for crowded band conditions?

Also is my bandwidth knob acting normal? Do you have to turn on the BFO to
use 4kc?