I finally acquired a 249 blanker for my 544. I have one in my 540 and have been quite pleased with it. It works! The problem is I do not have the "insulating fibre card" that fits under the board of the 249. Any ideas as to what I can use? Maybe some day I'll stop using Tritons and get a "new" radio------Nah. 73 Larry, N1SHM