We use Optical Character Recognition (OCR) during our scanning and processing workflow to make the content of each page searchable. You can view the automatically generated text below as well as copy and paste individual pieces of text to quote in your own work.
Text recognition is never 100% accurate. Many parts of the scanned page may not be reflected in the OCR text output, including: images, page layout, certain fonts or handwriting.
Selecting the Site (Step 2 Cont'd)
It is most desirable that the transmitter and antenna be located at the highest point above average terrain, nearest the center of the area to be served. This may be a tall building, a mountain, or other points with terrain or structural advantages in height.
Adaptability of existing plants, such as AM or FM transmitter sites, etc., should be explored as possible TV transmitter sites. Existing AM or FM antenna structures may be used to support the television antenna. Tower manufacturers will advise if this is possible.
Other factors of major importance to be considered are:
Space. Possibilities for expansion.
Land and construction costs.
Access to public utilities, (power, transportation, water, telephone, etc.).
Freedom from interference, such as high radio frequency field strength signals from AM stations or high audio noise levels.
The site should be selected only after exhaustive studies have been made, including (when doubt of coverage exists) experimental transmissions from the proposed
site so that field strength measurements can be made to predict, accurately, the coverage of the proposed station.
Antenna Supporting Structures
The area covered at the television frequencies increases almost directly with the increase in antenna height. Therefore, it is advisable to plan for maximum antenna height above average terrain-, consistent with supporting structure costs, interference with air lanes (Subject to Civil Aeronatic Authority approval), and building restrictions. Tower costs depend on whether
the structure is guyed or self-supporting, height, wind loading, footing, and installation complications.
Guyed towers are most practical, when space permits, since costs are much lower than the self-supported types of structures.
Antenna Gain and Transmitter Power
The Federal Communication Commission uses the Effected Radiated Power (ERP) of a television station in determining coverage and power. This is the product of transmitter power less transmission line loss times antenna gain.
8