W X R D R LEFT MODE RIGHT MODE GAIN UCAL GAIN UCAL 0 15 15 UP DOWN 5 5 0 15 15 UP DOWN 5 5 TFR WX/T WX MAP GCS TFR WX/T WX TEST MAP GCS Figure 11-143.  A typical on-board weather radar system for a high performance aircraft uses a nose-mounted antenna that gimbals. It is  usually controlled by the inertial reference system (IRS) to automatically adjust for attitude changes during maneuvers so that the radar  remains aimed at the desired weather target. The pilot may also adjust the angle and sweep manually as well as the gain. A dual mode  control panel allows separate control and display on the left or right HSI or navigational display.  Figure 11-144.  A receiver and antenna from a lightning detector  system.  Emergency Locator Transmitter (ELT) 11-65 time progresses, the marks may change color to indicate their  age. Nonetheless, a number of lightning strikes in a small  area indicates a storm cell, and the pilot can navigate around  it. Lightning strikes can also be plotted on a multifunctional  navigation display.  [Figure 11-145]  depictions of actual weather conditions. Terrain databases  are integrated to eliminate ground clutter. Supplemental  data includes the entire range of intelligence available from  the National Weather Service (NWS) and the National  Oceanographic and Atmospheric Administration (NOAA).  Figure 11-146  illustrates a plain language weather summary  received in an aircraft along with a list of other weather  information available through satellite or ground link weather  information services. A third type of weather radar is becoming more common in  all classes of aircraft. Through the use of orbiting satellite  systems and/or ground up-links, such as described with  ADS-B IN, weather information can be sent to an aircraft  in flight virtually anywhere in the world. This includes  text data as well as real-time radar information for overlay  on an aircraft’s navigational display(s). Weather radar  data produced remotely and sent to the aircraft is refined  through consolidation of various radar views from different  angles and satellite imagery. This produces more accurate  As mentioned, to receive an ADS-B weather signal, a 1090  ES or 970 UAT transceiver with associated antenna needs to  be installed on board the aircraft. Satellite weather services  are received by an antenna matched to the frequency of  the service. Receivers are typically located remotely and  interfaced with existing navigational and multifunction  displays. Handheld GPS units also may have satellite weather  capability.  [Figure 11-147]  An emergency locator transmitter (ELT) is an independent  battery powered transmitter activated by the excessive  G-forces experienced during a crash. It transmits a digital  signal every 50 seconds on a frequency of 406.025 MHz at 5  watts for at least 24 hours. The signal is received anywhere  in the world by satellites in the COSPAS-SARSAT satellite  system. Two types of satellites, low earth orbiting (LEOSATs)  and geostationary satellites (GEOSATs) are used with 