Hi Gary, Thanks for the clarifications. I had heard that IC-735 delivery was suspended for a while. The Twin PBT design used in the IC-781 was a unique Icom design, and did not involve the patent. I was not aware that the non-PBT IC-x75 versions were missing a filter. Cheers for now, 73, Adam VA7OJ/AB4OJ Scanned for viruses by Blue Coat http://www.WinProxy.com/