Hi Fred. I've been trying to make this work for a while. I'm no wizard with computers. Calrad was making kits for filters. All my AM filters are in use. Every one I build gets a AM filter, even the one I use on 220. You can change the selector jumper to use an SSB filter but won't sound the best. You can also just change the jumper to the open slot and jump across where the AM filter would go. You can bring the band width down with a cap and a resister. Just takes time to make it bearable. hi Will be REAL wide band but works! Be sure to diddle your AM oscillator on freq as stock they ran 700 hz off for RTTY. If you have a Timewave 599zx sitting around you can bring your skirts in with it in the audio section. The AM filter was also used in the FT-620. That's the only two Yeasu's that I'm aware of that use the 9mhx IF. I have used one out of another radio with some success. Won't fit perfect but will work. Just look for 9mhx AM or 6kc band width filters.
Dave
