My k3/10 puts out slightly more. Sometimes 9 or 9.5 watts equals 10. Since that drives the 100w pa I would expect a greater amount at 100w. I just figured it had to do with compression on ssb. Try it with zero compression. Also advise how much more it's putting out. 73 Mike R Sent from my spy ring Amateur/Ham Radio KE5GBC HF & Echolink