I have a question about signal-to-noise ratio on my ICOM 746 Pro. Specifically it relates to the 40 m band. Right now my antenna that I am using is a 10-40m TAK-tenna multiband antenna. I have it tuned to 7.2 MHz with an SWR of 1.2:1. The problem that I'm having is that I am getting a signal reading of S9 to S9 + 20. I am using a MFJ-993B auto tuner and will tune the antenna to 1.0:1 to 1.2:1 throughout the entire 40 m band. I am wondering what I can do to help with the noise. Can I use the DSP filters in my 746 Pro to help and if so how? Is there anything that I can do with the antenna? As a point of reference the noise on 20 m is between S3 and S4. Also another question is that does anyone know why when I turn my auto tuner on the volume goes up? Any help would be kindly appreciated.