Hi - I'm a bit confused about the proper filters for my Omni VI+. I operate cw 99%. It came with a 1.8 optional filter on the 9MHZ board and an open slot for the seocnd otional filter. What are the ideal filters for these two slots for a cw op? The 6.3 board is filled with the normal 250,500,1.8,2.4 compliment. Thanks for you help. 73/Tim NZ7C