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Artikelnummer:303033388485Fredericks 1200A RTTY demodulator - product manual. Fredericks 1200A RTTY demodulator - operators manual.The 1200A was a fabled commercial FSK demodulator from the 60s that was state-of-the-art in its day. This manual covers complete operation, includes all schematics, parts list, theory of operation, alignment, etc.