Fax technology resources! Radiofax (Weatherfax) Device sending radio fax signals around the world using radio waves, still in use for disseminating weather and meteorological data to vessels and places with no phone connection as well as by amateurs. T.38 Standards set by International Telecommunications Union for transmission of fax data through the IP based systems. Group 4 Compression Compression standard for black and white images with very high compression ratio, used by modern fax machines. Matt GerchowMatt Gerchow is an author, marketer, inventor, husband, father and yoga enthusiast. He enjoys travel to distant lands , fine wine, time with his family and dinner with friends.