Development of an Ultrawideband Magnetic-Tape Recorder, Phase II.
HARRY DIAMOND LABS ADELPHI MD
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An ultrawideband transient recorder is being developed at the Harry Diamond Laboratories with recording specifications beyond the state of the art. The progress made during phase I is described in HDL-TR-1573. This report presents the accomplishments of phase II and concludes the efforts of this program. The phase II laboratory recording system again includes a Newell-type tape transport that now accelerates tape at a rate of 8000 in.sq sec to a maximum speed of about 3000 in.sec. The recording heads developed for this system have either an all-ferrite core or a ferrite core with Alfesil pole tips. The flux is produced by a driven gap spacer placed between the pole faces. Signal frequencies from 100 kHz to 20 MHz, with bias frequencies of 100 MHz and above, have been recorded longitudinally for 5 to 8 sec. However, recordings with SNR of about 15 dB were possible for periods of only tens of milliseconds. The upper frequency of zero-bias-recorded signals was 36 MHz at a tape speed of 2800 in.sec. The recordings were reproduced on Mincom wideband recordersreproducers at 60 and 120 in.sec.
- Recording and Playback Devices