Modulator Calibrator for Helical-Scan Videotape Recorders

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Publisher: SMPTE — White Plains, NY, USA
Doc Type: Journal Article
Content Type: Original Research
Abbreviated Title: J SMPTE
Volume: 81, No. 9, pp. 664–668
Abstract: Determining that modulator frequencies for helical-scan videotape recorders were at least close to manufacturer's specifications required the time-consuming use of a calibrated oscilloscope and frequency generator until the use of integrated circuits made it possible to design and construct a simple, inexpensive device to calibrate the modulator. Once installed in the recorder the calibrator may be utilized to check and adjust the modulator prior to recording. The result is less time spent in preparing recorders for use and reduction of the possibility of over-modulation. Additionally, the use of the modulator calibrator decreases color moiré, and sideband noise, increases frequency response and results in a reduction in differential gain and phase errors. The use of this calibrator requires only the monitoring of the video output of the recorder with any waveform monitor or even an uncalibrated service scope.
Publication Date: 1972-09-01
DOI: 10.5594/J08227
ISSN: Print: 0361-4573
Link: https://doi.org/10.5594/J08227
Author(s): Harry KaemmererAmerican Tel. & Tel. Co., 195 Broadway, Room 900 Annex, New York, NY 10017
Michael H. CookNew York Telephone Co., 140 West St., Room 160, New York, NY 10007
Copyright: © 1972 Society of Motion Picture and Television Engineers, Inc.

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Harry Kaemmerer and Michael H. Cook; Modulator Calibrator for Helical-Scan Videotape Recorders, Journal of the SMPTE ( Volume: 81, Issue: 9, September 1972); SMPTE, 1972. Available at https://doi.org/10.5594/J08227

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Harry Kaemmerer and Michael H. Cook; Modulator Calibrator for Helical-Scan Videotape Recorders, Journal of the SMPTE ( Volume: 81, Issue: 9, September 1972); SMPTE, 1972. Available at https://doi.org/10.5594/J08227

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<span class="citation">Harry Kaemmerer and Michael H. Cook; <cite>Modulator Calibrator for Helical-Scan Videotape Recorders</cite>, Journal of the SMPTE ( Volume: 81, Issue: 9, September 1972); SMPTE, 1972. Available at <a href="https://doi.org/10.5594/J08227" target="_blank" rel="noopener">https://doi.org/10.5594/J08227</a></span>

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Harry Kaemmerer and Michael H. Cook; Modulator Calibrator for Helical-Scan Videotape Recorders, Journal of the SMPTE ( Volume: 81, Issue: 9, September 1972); SMPTE, 1972
doi: 10.5594/J08227
url: https://doi.org/10.5594/J08227

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<li>
Harry Kaemmerer and Michael H. Cook; <cite id="bib-10-5594-j08227">Modulator Calibrator for Helical-Scan Videotape Recorders</cite>, Journal of the SMPTE ( Volume: 81, Issue: 9, September 1972); SMPTE, 1972
<span class="doi">10.5594/J08227</span>
</li>