AN/ARC-210
The ARC-210 is a family of radios for military aircraft that provides two-way, multi-mode voice and data communications over a 30 to 512+ MHz frequency range. It covers both Ultra High Frequency (UHF) and Very High Frequency (VHF) bands with AM, FM and SATCOM capabilities. The ARC-210 radio also includes embedded anti-jam waveforms, including Havequick and SINCGARS, and other data link and secure communications features, providing total battlefield interoperability and high-performance capabilities in the transfer of data, voice and imagery. It features a separate guard receiver for monitoring 121.5 and 243 MHz while  simultaneously monitoring the active channel selected. Transmitter power ranges from 5 to 23 watts, depending on frequency and mode. The radios communicates with other avionics over a MIL-STD-1553 data bus. The ARC-210s are manufactured by Rockwell Collins and are installed in a wide range of aircraft, helicopters and ships across all five U.S. military services. The ARC-210 program began in 1990; it is installed on more than 180 platforms and is operating in more than 40 countries. As of 2010, 30,000 have been produced and by October 2016, 40,000 delivered. The radios have generated over $2 billion in  sales for the company. There are six generations of the radios. Models include the RT-1556, RT-1794, RT-1824, RT-1851, RT-1851A, and RT-1939, RT-1939A, RT-1990, RT-1990A and the RT-2036. The earliest model covered 30-400 MHz. The fifth generation RT-1939 is one of the first military radios to have software-programmable encryption under the National Security Agency’s (NSA) Cryptographic Modernization Initiative. Its frequency range is extended and includes the following bands: Continuous Tone-Coded Squelch System (CTCSS), used by many public safety agencies, is available above 400 MHz and below 88 MHz. The transceiver weighs about 12.2 lb (5.53 kg). Available  accessories include remote controls, transmit power amplifiers, receive low noise amplifiers, and ground support equipment.