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Military aircraft also use a dedicated UHF-AM band from 225.0 to 399.95 MHz for air-to-air and air-to-ground, including air traffic control communication. This band has a designated emergency and guard channel of 243.0 MHz. [2] [8] Radio aeronautical navigation aids use other frequencies.
Once the target frequencies were identified, radio frequency jamming could easily be employed to degrade or completely disable communications. The Have Quick program was a response to this problem. Engineers recognized that newer aircraft radios already included all-channel frequency synthesizers along with keyboards and displays for data entry.
The aircraft emergency frequency (also known in the USA as Guard) is a frequency used on the aircraft band reserved for emergency communications for aircraft in distress.The frequencies are 121.5 MHz for civilian, also known as International Air Distress (IAD), International Aeronautical Emergency Frequency, [1] or VHF Guard, [1] and 243.0 MHz—the second harmonic of VHF guard—for military ...
US frequency allocations chart, ... Aircraft 108–136 1 Land mobile (EU) 120–160 ... TV UHF 470–806 5000 Land mobile 806–947 0.035
The IEEE defines the UHF radar band as frequencies between 300 MHz and 1 GHz. [1] Two other IEEE radar bands overlap the ITU UHF band: the L band between 1 and 2 GHz and the S band between 2 and 4 GHz. UHF television antenna on a residence. This type of antenna, called a Yagi–Uda antenna, is widely used at UHF frequencies.
This was later replaced by the AN/APS-143(V)-1 Airborne Sea Surveillance Radar. It can detect a person in a life raft up to 25 miles away. The aircraft has a fixed antenna array that receives and records telemetry from test and drone vehicles flying over the Gulf of Mexico. It can relay two UHF frequencies over the horizon to ground sites. [2]
225 MHz and above (UHF): Military aircraft radio, 243 MHz is an emergency frequency (225–400 MHz) AM, including HAVE QUICK, dGPS RTCM-104; Cable television, though not transmitted aerially, uses a spectrum of frequencies overlapping VHF. [11]
2,304.1 MHz Region 2 CW & SSB calling frequency [2]; 2,320.2 MHz Region 1 Narrow-band calling frequency [3]; 2.400–2.485 GHz: Spread Spectrum band for general radio-controlled aircraft recreational use (amateur radio license holders have 2.39–2.45 GHz licensed for their general use in the USA) and using both frequency-hopping spread spectrum and direct-sequence spread spectrum RF ...