Hello again , Regarding an IC751A , which filters should I opt for, wanting mainly to be able to handle SSB and RTTY QRM? (few local S9+30Db friends, and\or many S9 pileups) ? Also, I have seen somewhere a discussion about the considerations for installing IF-filters at various IF's - can anyone point me there? Thanks for the education - in advance. Greetings, de Isaac, 4Z4TL