Hi James. Yes, I've done plenty of adjusting with the Ref Level.
I live in a very small, old town here in North Florida. Every year, (around the start of the Es season), I have a problem with powerline RFI.
Luckily, our RFI investigator is an Extra and REALLY know his business finding problems.
I only mention this because the NB in the 7300 (and 7610) is just AMAZING!
That was the one and only issue I ever had with the old 756PRO. It did nothing. The NB on the 745 and 761, were both excellent.
Thanks again for the response.
ron
N4UE