Hello All, I'm not an expert. I too feel the receiver is noisy. Yet I hesitate to say it's noise. What happens if you put dummy load on the radio? Does the noise go away? Terms I don't understand are: B bandpass, C bandpass, B octave, and C octave. Could I be hearing a tone / pitch of the receivers audio output and feel it's noise? Venting..... Ted WP4CW