Introduction to the ZFW-2/ZSW-2 Character Facsimile Machine. Open PDF Document Details Document Type Technical Report Publication Date Mar 18, 1983 Accession Number ADA128052 Entities Organizations National Air and Space Intelligence Center Tags DTIC Thesaurus Topics Amplitude Modulation Carrier Frequencies Circuits Crystal Oscillators Demodulation Energy Consumption Foreign Technology Frequency Frequency Bands Modulation Optical Fibers Personality Phase Phase Modulation Power Supplies Scanning Transmitters