I was wondering if it's possible to use an FL-223 SSB filter instead of the FL-30 SSB filter into an IC765. Both filters are for the 9Mhz IF; I know about a mod for using a second SSB filter located into the CW filter space but I have a 250hz CW filter so I can't do that. 73 Fabio Roccatagliata IZ1EGT