106-23 Annex A-2: Magnetic Tape Recorder and Reproducer Information and Use Criteria
Abstract
Wide-band double-density analog recording standards allowing recording of up to 4 megahertz (MHz) signals at 3048 mm/s (120 in/s) 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 track's response within the + or - 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. The 14-track interlaced heads are not compatible with tapes produced on an in-line standard configuration. If tapes must be interchanged, either a cross-configuration dubbing may be required or a change of head assemblies on the reproducing machine is necessary. High energy magnetic tape is required for double-density systems. Such tapes are available but may require special testing for applications requiring a low number of dropouts per track.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 11, 2023
- Accession Number
- AD1205438