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Development of VHF and UHF Propagation Curves for TV and FM Broadcasting.

PB174288

Publication Date	1966
Personal Author	Damelin, J.; Daniel, W. A.; Fine, H.; Waldo, G. V.
Page Count	41
Abstract	New propagation curves for use in television and frequency modulation broadcasting were developed from an extensive analysis of data accumulated since these broadcasting services were established. A new method of applying terrain roughness factors for improving the accuracy of field strength predictions was developed for use with the new curves. The new curves apply for both the median and the field strength exceeded 10% of the time. At distances out to about 15 or 20 miles from the transmitter, the new VHF and UHF curves are nearly the same as those presently in the FCC Rules. Field strengths indicated by the new VHF curves range from about 2 dB to 6 dB lower at further distances out to about 60 miles for 500 foot antennas, and 100 miles for 2000 foot antennas. For UHF the field strengths are somewhat lower than indicated by the present curves, reaching a maximum change at distances in the order of 60 miles. There is very little change for average UHF antenna heights for distances beyond 110 miles. (Author)
Keywords	Radio transmission Graphics Very high frequency Ultrahigh frequency Propagation Frequency modulation Television communication systems Radio communication systems
NTIS Subject Category	45C - Common Carrier & Satellite
Corporate Authors	Federal Communications Commission, Washington, D. C. Research Div.
Document Type	Technical Report
NTIS Issue Number	196709

Development of VHF and UHF Propagation Curves for TV and FM Broadcasting.

Development of VHF and UHF Propagation Curves for TV and FM Broadcasting.
PB174288

Publication Date	1966
Personal Author	Damelin, J.; Daniel, W. A.; Fine, H.; Waldo, G. V.
Page Count	41
Abstract	New propagation curves for use in television and frequency modulation broadcasting were developed from an extensive analysis of data accumulated since these broadcasting services were established. A new method of applying terrain roughness factors for improving the accuracy of field strength predictions was developed for use with the new curves. The new curves apply for both the median and the field strength exceeded 10% of the time. At distances out to about 15 or 20 miles from the transmitter, the new VHF and UHF curves are nearly the same as those presently in the FCC Rules. Field strengths indicated by the new VHF curves range from about 2 dB to 6 dB lower at further distances out to about 60 miles for 500 foot antennas, and 100 miles for 2000 foot antennas. For UHF the field strengths are somewhat lower than indicated by the present curves, reaching a maximum change at distances in the order of 60 miles. There is very little change for average UHF antenna heights for distances beyond 110 miles. (Author)
Keywords	Radio transmission Graphics Very high frequency Ultrahigh frequency Propagation Frequency modulation Television communication systems Radio communication systems
NTIS Subject Category	45C - Common Carrier & Satellite
Corporate Authors	Federal Communications Commission, Washington, D. C. Research Div.
Document Type	Technical Report
NTIS Issue Number	196709