My FT-991A has been getting reports of splatter when I enable the speech processor, even with conservative settings. I'm only running about 15% compression and keeping ALC deflection minimal, but still getting complaints from nearby stations during evening nets on 40m. The manual suggests these settings should be clean, but clearly something's not right.

• Mic gain set to barely tickle ALC on voice peaks
• Speech proc at 15% (tried as low as 10%)
• Standard SSB filter (2.4kHz)

Anyone else experience this issue with Yaesu rigs?

The FT-991 series gets really dirty fast if you hit ALC hard - try backing off mic gain until you see zero ALC deflection, then add just a tiny amount of processing. That radio is notorious for IMD issues even following the manual.

I had similar problems with my FT-991. Audio compression introduces harmonic distortion, creating harmonics at 6kHz, 9kHz and beyond that cause splatter if not filtered properly. Ended up disabling internal processing entirely and using external audio processing instead.

Check your RF power output while speaking - most rigs show about 30W average with proper mic gain, but people max everything trying to see 100W average reading, resulting in horrible audio and dirty signals. Less is definitely more with that particular radio.