Modulator Calibrator for Helical-Scan Videotape Recorders

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Publisher: SMPTE
Doc Type: Journal Article
Article Type: research-article
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
Link: https://doi.org/10.5594/J08227
Author(s): Harry Kaemmerer, Michael H. Cook

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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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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>