I have been running very tight 500Hz receive filters and for the most part they have been working great. However I realized that some stations are off my freq by 50-80Hz and the link becomes a problem as they are now getting one side of the spectrum cut-off. For stations that are off that far I have to run 600Hz filters.
Most stations I work have an AFC correction of no more than 2Hz but there have been a few stations that are in the 50-80Hz range on the AFC meter.
500Hz filter:
600Hz filter:
Question- When using narrow filters the density of the waterfall display increases a lot. Visually it would suggest more noise yet when I use 500 BW filter on my IC-7300 VARA modem still seems to decode fine. Is this an effect of 7300 software or an effect of filters in general (or SDR filters/display). I watch the waterfall a lot and at narrow settings the signal is lost in the "noise".