The simplest way to compensate the rain fade effect in satellite communications is to increase the transmission power: this dynamic fade countermeasure is called uplink power control (UPC). In any case, it has a limited used since it cannot provide large margins: transmitting amplifiers have a non-linear behaviour increasing the power and the output power is limited. The limitations increase when the radiating antenna is on the satellite: that is why power control is used only in uplink. In satellite communications, rain fade refers to the absorption of a microwave Radio Frequency (RF) signal by rain or snow, and is especially prevalent in frequencies above 11 GHz. ... U.S. military MILSTAR communications satellite A communications satellite (sometimes abbreviated to comsat) is an artificial satellite stationed in space for the purposes of telecommunications using radio at microwave frequencies. ... In biology, antenna (plural: antennae) refers to the sensing organs of several arthropods. ... A satellite is an object that orbits another object (known as its primary). ... This article deals with Uplink in the telecommunications terminology. ...