A high data rate recorder for astronomy

Details A high data rate recorder for astronomy A high data rate recorder for astronomy

May 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991itm....27.3455h&link_type=abstract

IEEE Transactions on Magnetics (ISSN 0018-9464), vol. 27, May 1991, p. 3455-3465. Research supported by NASA, National Radio Ast

Astronomy and Astrophysics

Astronomy

2

Data Recorders, Tape Recorders, Very Long Base Interferometry, Geodesy, Magnetic Tape Transports, Radio Astronomy, Vacuum

Scientific paper

A magnetic tape recorder developed for the special requirements of radio astronomy and geodesy is described. These requirements include a high bit packing density and long record times. The current version of this longitudinal recorder used by the Very Long Baseline Array (VLBA) records 5.5 Terabits on a 14-in diameter reel of inch-wide tape. A maximum record rate of 256 Mb/s is achieved in the VLBA configuration with one recorder operating at 4 ms and utilizing 32 of the heads in a single stack. The VLBA recorders have been tested using a longitudinal density of 2.25 fr/micron; 448 data + 56 system tracks are recorded in 14 passes, each lasting 50 min, for a total record time (at 128 Mb/s) of 12 h on 14-in diameter reel of inch-wide 13-microns-thick D1-equivalent tape.

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