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[edit] Magnetic tape

I have removed the stuff about PPMs and soft tape compression. This cannot be true because the PPM was developed in the 1930s, long before the existence of magnetic tape (except the early steel stuff with DC bias), let alone an understanding of tape compresssion. None of the BBC sources (Pawley, and the Engineering Training Supplement on PPMs) mention tape compression as a factor. Harumphy 07:21, 21 April 2006 (UTC)