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Telemetry Standards. Annex A-2: Magnetic Tape Recorder and Reproducer Information and Use Criteria
[Technical Report, Technical Report]
Range Commanders Council
Pagination or Media Count:
Wide-band double-density analog recording standards allowing recording of up to 4 megahertz MHz signals at 3048 mms 120 ins are included in these standards. For interchange purposes, either narrow track widths 0.635 mm 25 mils must be employed, or other special heads must be used. These requirements are necessary because of the difficulty in maintaining individual head-segment gap-azimuth alignment across a head close enough to keep each tracks response within the 2-dB variation allowed by the standards. Moreover, at the lower tape speeds employed in double-density recording, the 38-mm 1.5-in. spacing employed in interlaced head assemblies result in interchannel time displacement variations between odd and even tracks that may be unacceptable for some applications. Therefore, it was decided that a 14-track in-line configuration on 25.4-mm 1-in. tape should be adopted as a standard. This configuration results in essentially the same format as head number one of the 28-track interlaced configuration in the standards.
[A, Approved For Public Release]