Reception and Distribution of Terrestrially Delivered Digital Channels in the Existing Analogue Environment

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Publisher: SMPTE — White Plains, NY
Doc Type: Conference Paper
Content Type: Original Research
Volume: 1999, No. 7, pp. 31–38
Abstract: The forthcoming introduction of terrestrial digital television broadcasts while heralding a new era in television also ushers in a lengthy period of coexistence with the existing well established analogue system. While this dual mode of broadcasting theoretically can be accomplished quite easily, the real world practical implementation can turn out to be somewhat more involved and problematic. Utilisation of the adjacent unused guard band channel while providing for an efficient use of available bandwidth together with compatibility of existing receiving antennas and distribution infrastructure, does not however allow for the deviations often encountered. Broadcasts emanating from one or more towers while of the same power do not necessarily translate to even levels in received signals at a reception site. While antennas and associated distribution components all display a degree of uneven response over their operating bandwidth resulting in distortion of levels received from theoretically even field strengths, far greater and often unavoidable fluctuations can occur prior to reception of these fields. The reliance on 10dB or more of level difference to provide protection to the analogue channel could turn out to be ineffective in numerous instances. Going by the differences in non-adjacent channels, with the expected similar propagation in the adjacent digital channel, protection can rapidly approach 0dB! Together with the inheritance of over forty years of non-engineered and poorly installed distribution systems, the introduction of digital might not prove to be the simple task that the theory might suggest.
Publication Date: 1999-07-01
DOI: 10.5594/M001166
Link: https://doi.org/10.5594/M001166
Author(s): George Kozak
bio
Born and grew up in Sydney, becoming a qualified electronics & communications technician. Began working in electronics field in computer repair and related products. After a short period at Channel 10 was involved with video production equipment repair and maintenance. Began Modern Antenna Systems as a sideline designing and installing T.V. receiving systems. Subsequently been engaged full time in this field for fourteen years, by necessity concentrating on faultfinding and repair of existing systems. Currently is consulting for SOCOG on CATV systems for Sydney 2000 Olympic venues. Having been involved with the Electronic Services Industry Association (E.S.I.A.) since soon after it's formation, is currently it's president and represents it on Standards Australia committee CT/2 and chairs CT/2/G.
Copyright: © 1999 Society of Motion Picture and Television Engineers, Inc.

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George Kozak; Reception and Distribution of Terrestrially Delivered Digital Channels in the Existing Analogue Environment, SMPTE Meetings and Conferences ( July 1999); SMPTE, 1999. Available at https://doi.org/10.5594/M001166

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George Kozak; Reception and Distribution of Terrestrially Delivered Digital Channels in the Existing Analogue Environment, SMPTE Meetings and Conferences ( July 1999); SMPTE, 1999. Available at https://doi.org/10.5594/M001166

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<span class="citation">George Kozak; <cite>Reception and Distribution of Terrestrially Delivered Digital Channels in the Existing Analogue Environment</cite>, SMPTE Meetings and Conferences ( July 1999); SMPTE, 1999. Available at <a href="https://doi.org/10.5594/M001166" target="_blank" rel="noopener">https://doi.org/10.5594/M001166</a></span>

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<li>
George Kozak; <cite id="bib-10-5594-m001166">Reception and Distribution of Terrestrially Delivered Digital Channels in the Existing Analogue Environment</cite>, SMPTE Meetings and Conferences ( July 1999); SMPTE, 1999
<span class="doi">10.5594/M001166</span>
</li>