Radio Propagation by Thomas K. Dover

Author:Thomas K. Dover [Thomas K. Dover]
Language: eng
Format: epub
Publisher: Thomas K. Dover - Dover Telecommunication Services
Published: 2014-09-21T16:00:00+00:00

Note the path attenuation on the left hand column is scaled at dB/km. This means worst case at 18GHz could reach .5dB/km. If a path is 20km in length, this can create a big fade.

It takes a lot of rain to really attenuate a path, but the results equate to outages. This is a prime factor for short paths above 10GHz.

INTERFERING CARRIERS

Figure 14: Interference

An interfering carrier is another source of radiation getting into the receiver and masking the desired signal. It may be off frequency, over driven, or the wrong physical location from that which is coordinated and on their license.

Most microwave paths are licensed, thus, we are protected by the FCC from this type of interference. However, when it happens, we must notify the owner of the offending transmitter, and if the problem is not corrected then report them to the local Telecom Rep. who may report it to the FCC.

Multipath Reflections

When part of the original wave is reflected and arrives out of phase with the original, it causes interference between the two at the receiver. They may add constructively showing higher gain, or may add destructively showing reduced gain.

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