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Since the end of World War II U.S. and allied military aircraft have used AM radios in the 225-400 MHz UHF band for short range air-to-air and ground-to-air communications. Military planners made no provision for securing these communications on tactical aircraft and helicopters or protecting them from jamming into the post- Vietnam War era. Progress in electronics in the 1970s reached a point where anyone with an inexpensive police scanner could intercept tactical military communications. Jamming was not much harder.

The HAVE QUICK program was a response to this problem. It recognized that newer aircraft radios already included all-channel frequency synthesizers along with keyboards and displays for data entry. All that was needed was an accurate clock and a microprocessor to add frequency hopping to these radios.

Aircraft and ground radios that employ HAVE QUICK must be initialized with accurate time of day (usually from a GPS receiver), a word of the day which serves as a key and a net number (allowing multiple network to use the same word of the day). The word of the day, time of day and net number are input to a cryptographic pseudorandom number generatorA pseudorandom number generator PRNG is an algorithm which generates a sequence of numbers, the elements of which are approximately independent of each other. The outputs of pseudorandom number generators are not truly random—they only approximate some of that controls the frequency changes.

HAVE QUICK is not an encryptionThis article is about algorithms for encryption and decryption. For an overview of cryptographic technology related to encryption, see cryptography. In cryptography, encryption is the process of obscuring information to make it unreadable without special system, though many HAVE QUICK radios can be used with encryption, e.g. the VINSONVINSON is a family of voice encryption devices used by U. and allied military and law enforcement, based on the SAVILLE encryption algorithm and 16 Kbps CVSD audio compression. It replaces the Vietnam War-era NESTOR ( KY-8/ 28/ 38) family. VINSON devices system. HAVE QUICK is not compatible with SINCGARSSINCGARS stands for "Single Channel Ground and Airborne Radio System. It provides U. and allied military commanders with a reliable, secure, easily maintained Combat Net Radio (CNR) that handles voice and data. Vehicle-mount, backpack, airborne, and now h, the VHF - FMFM redirects here, for alternate uses, see Fm Frequency modulation (FM) is the encoding of information in either analogue or digital form into a carrier wave by variation of its instantaneous frequency in accordance with an input signal. This is typically radios used by ground forces, which operate in a different radio band and use a different frequency hopping method; however some newer radios support both.

HAVE QUICK was well accepted and most U.S. military aircraft now use it ( 20042004 is a leap year starting on Thursday (the link is to a full 2004 calendar), and has also been designated the: International Year of Rice International Year to Commemorate the Struggle against Slavery and its Abolition Elections are to be held in 73 co). Improvements include HAVE QUICK II and the Second generation Anti-jam Tactical UHF Radio for NATOThe North Atlantic Treaty Organisation NATO , sometimes called North Atlantic Alliance Atlantic Alliance or the Western Alliance is an international organization for defense collaboration established in 1949, in support of the North Atlantic Treaty signed (SATURN). The latter features faster frequency hopping. HAVE QUICK is expected to be replaced byt the Joint Tactical Radio System sometime after 2008.