I watched a video that
Steve Hicks made about noise. You can find the video here: https://youtu.be/xXXj1Ko4ZXg?t=352
In this video he mentions several noise sources: Thermo, Gaussian, flicker, quantification, phase, additive, splatter, atmospheric, power line, spark, power supply and a few more I have forgotten. In this talk he is only concerned with Thermo, Gaussian and Atmospheric noise. He talks about signal to digital conversion, FFT, dBm, bin size, noise floor and several other noise related topics. This is a great technical talk on how our radios receive signals. Being a practical person, my whole take away is that if I reduce my receive bandwidth during my digital mode qso (or any mode for that matter) signal strength would improve in relation to noise.
Most of the time I use a spot and pounce technique on FT8. In order to see FT8 signals to decode, I originally set the receive bandwidth to 2500-3000 Hz wide where stations are sending these signals. When I spot a station I want to work, I double click on their line and my transmitter moves to that frequency and starts send my call and grid. During this transmission, I use the RX box to change the receive bandwidth to about 100 Hz covering my transmitted signal. When the station replies to my transmission, a -10 signal level initially is now +15 or higher most of the time.
So my new idea is this: When in digital modes, could we add the ability to preset the receive bandwidth at the transmitted frequency. It will need a toggle because you would not want this to happen while working stations on digital split within the original 2500-3000 Hz bandwidth.