Dear Mal, LF Group, WSPR reports amongst stns indicate reception reports usually minus dB. Most of these stations are usually PLUS dB >with me or very close to that figure. So what does that prove.
Two points Why waste 2.4 kHz when QRS only needs a few Hz with a better S/N ratio. You agree that a faint trace is visible. If this faint trace was QRS mode only a few Hz bandwidth would be necessary