Title :
A novel method of measuring the deviation of video FM modulators
Author :
Uyttendaele, A.G.
fDate :
9/1/1988 12:00:00 AM
Abstract :
The author presents a simple yet accurate method of verifying, and if necessary adjusting, the frequency deviation of the visual carrier and of the aural subcarriers without having to resort to the indirect method of carrier Bessel null. The method proposed is a direct method in that it measures the actual deviation of the FM carrier when this carrier is modulated with video test signals. This assures optimum use of the available transponder bandwidth for single or dual video operation. Tables and charts are provided for determining the levels of test tones for any frequency deviation of the main carrier or aural subcarrier
Keywords :
frequency measurement; frequency modulation; modulators; television equipment; video signals; FM carrier; aural subcarriers; charts; direct method; frequency deviation measurement; test tones; transponder bandwidth; video FM modulators; video test signals; visual carrier; Band pass filters; Bandwidth; Circuit testing; Cities and towns; Colored noise; Downlink; Frequency modulation; Low-frequency noise; Transponders; Voltage-controlled oscillators;
Journal_Title :
Broadcasting, IEEE Transactions on
