The Collins 136C-1 Noise Blanker seems interesting. 73, Dick - KA5KKT _____ The Collins noise receiver operated around 40 Megacycles, as we said in those days. My late friend and "Elmer", Lee, W7UVR was one of the first kids on the block to have a 136C-1 blanker to use with his 75A-4. <snip>