A thermal fade is a phenomenon of wireless signal degradation (fading) caused by temperature and relative humidity factors.[1] As the prevailing environmental conditions change (e.g., from hot to cool, humid to arid, or day to night), the electromagnetic waves refract differently, thus altering the power distribution and possibly the direction of the signal. This is the same process that causes visible light to "bend" over a heated road or other surfaces on hot days.
Thermal fade primarily affects very and ultra high frequencies, regardless of modulation method (AM, FM, etc.). The thermal fade margin is calculated from subtracting losses from antenna gains.[2] A higher fade margin is required in humid locations, and lower in dry ones.[3]
^Flickenger, Rob; Weeks, Roger (2005-11-22). Wireless Hacks: Tips & Tools for Building, Extending, and Securing Your Network. "O'Reilly Media, Inc.". p. 144. ISBN 978-0-596-55329-6.
^Ishii, T. Koryu (1995-10-16). Handbook of Microwave Technology. Academic Press. p. 492. ISBN 978-0-08-096237-5.
^Cavell, Garrison C. (2017-07-28). National Association of Broadcasters Engineering Handbook. Taylor & Francis. p. 974. ISBN 978-1-317-39630-7.
A thermalfade is a phenomenon of wireless signal degradation (fading) caused by temperature and relative humidity factors. As the prevailing environmental...
are many times cut in half and brake fade is nearly eliminated. Brake failure is also caused by brake drum thermal expansion in which brake shoe clearance...
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image would fade rather rapidly compared with the much more expensive, but durable 3M technology. Texas Instruments invented the thermal print head in...
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resist brake fade, caused by an increase in temperature the material will experience from the conversion of kinetic energy into thermal energy. The effects...
magnetometers - Solar X-ray Imager (SXI) - synodic - synoptic chart - thermalfade - thermosphere - time signal - total electron content - troposphere -...
pressures. Color is achieved with pigments rather than dyes for excellent fade-resistance. The chief advantage of solvent inks is that they are comparatively...
fine-scale phase and amplitude fluctuations in undersea sound waves caused by thermal gradients and sloping ocean bottoms. This acoustic research was conducted...
compounds fade back to their clear state by a thermal process, the higher the temperature, the less dark photochromic lenses will be. This thermal effect...
Crotalus concolor, commonly known as the midget faded rattlesnake, faded rattlesnake, and yellow rattlesnake, is a pit viper species found in the western...
in the ionic and covalent bonds cause most ceramic materials to be good thermal and electrical insulators (researched in ceramic engineering). With such...
discovery. Whether the original spot dissipated and reformed, whether it faded, or if the observational record was simply poor is unknown. The first sighting...
inherent limitations of thermal paper, photographs printed on thermal paper will fade over time (this depends heavily on the thermal paper variant used, and...
electricity from sunlight, while CSP – often called concentrated solar thermal – uses the heat from the sun's radiation in order to make steam to drive...
obscure the image, or it may fade completely over time; Thermal transfer for applications that cannot use thermal (thermal direct) label material because...
battery degradation are driver patterns, driver aggression, climate, cabin thermal dynamics, and infrastructure, with driver patterns and climate being the...
and fading of soft furnishings) and heat loss when ambient air temperatures fall Installing glazing where solar gain during the day and thermal losses...
much as 12" at 300 yards. The second was "moisture incursion" or "reticle fade", which causes the viewing glass to fog up and the aiming point to lose brightness...
thermal printers use heat sensitive paper (similar to thermal fax paper). Direct thermal labels tend to fade over time (typically 6 to 12 months); if exposed...
does not transport a conserved amount of energy over distances but instead fades with distance, with its energy (as noted) rapidly returning to the transmitter...
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