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2001: On April 1, 2001, a mid-air collision between a United States Navy EP-3E ARIES II signals surveillance aircraft and a People's Liberation Army Navy (PLAN) J-8II interceptor fighter jet resulted in an international dispute between the United States and the People's Republic of China called the Hainan Island incident.
It is currently in service at brigade and higher levels in the United States Army and by other countries. The radar is trailer-mounted and towed by a 2 + 1 ⁄ 3 -short-ton (2,100 kg) truck. A typical AN/TPQ-37 system consists of the Antenna-Transceiver Group, Command Shelter and 60 kW Generator.
The Army never acquired the ARA 1.5 to 3.0 MHz receiver, nor the ATA 2.1 to 3.0 MHz transmitter. Initially, it did not acquire the 3.0 to 4.0 MHz transmitter, nor the 0.52 to 1.5 MHz receiver, but the need to communicate on the common civil airfield frequency of 3.105 MHz plus the anticipated USAAF use of the AN/ARR-1 homing adapter (see below ...
A U.S. Navy TACAMO EC-130Q of VQ-4, in 1984. The acronym was coined in 1961 [citation needed] and the first aircraft modified for TACAMO testing was a Lockheed KC-130 Hercules which in 1962 was fitted with a VLF transmitter and trailing wire antenna to test communications with the fleet ballistic missile submarines (see communication with submarines).
There are 4,096 total radiators, 4,352 receivers, and 128 auxiliary elements on each antenna array. The power requirement of SPY-1A is four times that of the AN/SPS-48. The AN/UYK-7 computer controls SPY-1. [5]: 316–317 SPY-1A is a development of SPY-1, resulting from the deployment of SPY-1-equipped USS Ticonderoga off the Lebanese coast. It ...
The AN/TPS-75 radar antenna packed on a 5-ton truck. The AN/TPS-75 is the primary transportable Aerospace Control And Warning (AC&W) radar used by the United States Air Force. [n 1] [1] The TPS-75 is capable of transmitting 5-Megawatts of power. (Although 5-Megawatts is almost never achieved; realistically it is approx 2.8 Megawatts)
The transmitter, a highly modified SCR-271 radar set from World War II, [1] provided 3 kilowatts (later upgraded to 50 kilowatts) at 111.5 MHz in 1 ⁄ 4-second pulses, applied to the antenna, a "bedspring" reflective array antenna composed of an 8x8 array of half wave dipoles and reflectors that provided 24 dB of gain.
The ends of the transmission lines were grounded by 1 to 3 miles (1.6 to 4.8 km) of buried copper cable and ground rods, [2] later replaced by arrays of electrodes in deep 300-foot (91 m) boreholes [1] The transmitters sent alternating currents of 300 amperes through the lines, which passed through the buried electrodes deep into the Earth.