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c. -single element antenna
WITH TRANSMITTER POWER INCREASED TO EQUAL COVERAGE OF B. B &.C SAME EFFECTIVE RADIATED POWER.
FIG. 9 (above). Coverage patterns showing effect of antenna gain on radiation field.
tenna height of 500 feet and effective radiated powers from 1 to 1000 kilowatts. Fig. 1 1 shows how radius of coverage in miles is affected by changes in antenna height with fixed effective radiated powers.
Although the curves of Fig. 10 show little increase in the radius of the outer coverage
contour (Grade “B” service) above effective radiated powers in excess of 200 kilowatts, the signal strength at the receiver within the area increases considerably.
The curves are for average terrain and, under actual conditions, true coverage may vary greatly from that predicted.
Programming the TV Station (Step 3)
Sources of program material must be determined in arriving at an overall program policy.
There are four major sources of program material — network, film and slide, live studio and remotes. The program facilities required will depend on the above sources, expanding greatly with the live studio and remote originations. Effects of such activities on operating expenses are shown in the TV station operating expense analysis. Of primary consideration is the amount of program expense which can be incurred consistent with a sound operation, financially.
In planning costs of program facilities, consideration must be given to the extent of programming activities from the various sources and the provision made for adequate facilities to support such program planning. Items to be considered in connection with facilities are: Studio size, lighting, acoustic treatment, air conditioning, staging, scenery, properties, special effects, cameras, camera dollies, audio systems, inter-communication systems, mobile units, microwave facilities, availability of network connections, etc.
The best approach to the problem of the extent of the technical facilities is through a systems layout plan showing both video and audio facilities. Manufacturers of television equipment have experienced personnel to assist your engineering consultant or chief engineer in analysis of facilities re quired, based on program plans, in development of facilities planning.
FIG. 10. Coverage curves showing "ERP" versus "Miles Coverage".
FIG. 11. Coverage curves showing "Miles Coverage" versus antenna height with fixed "ERP" values.
FROM FCC-F 10 SO CURVES
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