Page:CAB Accident Report, United Airlines Flight 16.pdf/24

 station consisted of two range transmitters and a positive station location marker* transmitter with the necessary accessory units 'installed in a trans- mitter house at the range station site and an auxiliary power unit which automatically starts and picks up the electrical load in the event of a failure of the commercial power supply. The tower installation and the transmission line feeder cable (used to supply the radio frequency energy to the various towers) which had been used for the station before moderni- zation, were retained except that the towers were modernized by the instal- lation of rain shields* and the erection about their bases of a countéz- In poise system.* The course alignment of the range was left unchanged, order to permit the range to serve two of the airways which intersected at Salt Lake City, it has been "squeezed" and "bent" so that the published beari ing of the north leg is 152 degrees magnetic, the south leg 343 degrees magnetic, the east leg 232 degrees magnetic, and the west leg 70 degrees magnetic,**the arigles between adjacent legs of the range thus varying from 80 to 111 degrees, The equipment of the range staticn is controlled by means of a dialing system from the Airways - Communication Station located in the Administration A positive station location marker is a transmitter which produces a field concentrated in a small area directly over its antenna system. Such trans- mitters are located at radio range stations to act as radio location markers. Rain shields are metal shields which are placed around insulators of a radiating system for the purpose of protecting those insulators against rain, snow, sand, etc. A counter-poise system as used with a radio range is a wire screen platfom hela horizontally above the ground by supporting stanchions. This entir metallic structure is connected to the ground. Such systems are put around the base of vertical rediators to offset the effedt of waving and growing vegetation, the ebb and flow of tides, etc. area surrounding Salt Lake City.
 * See Appendix c, a mep showing the Salt Lake City Radio Range and the