Hi Marc, The Po scale on the IC-7800 is not peak-reading. There is only one really accurate method for measuring PEP: http://www.ab4oj.com/peptest.html If your IC-7800 delivers 210W to a 50-ohm load in FM or RTTY mode, it will put out 200W PEP on SSB if Mic Gain is adjusted for a mid-range ALC reading (30 - 50%) on voice peaks. Cheers for now, 73, Adam VA7OJ/AB4OJ