HAVE QUICK (also HAVEQUICK, short HQ) is an ECM-resistant frequency-hopping system used to protect military aeronautical mobile (OR) radio traffic.
Since the end of World War II, U.S. and Allied military aircraft have used AM radios in the NATO harmonised 225–400 MHz UHF band (part of NATO B band[1]) for short range air-to-air and ground-to-air communications. During development and the procurement of UHF radios, military planners did not require features to secure communications for aircraft and helicopters from jamming until the post-Vietnam War era. Progress in electronics in the 1970s reached a point where anyone with an inexpensive radio frequency scanner or receiver set could intercept military communications. 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 only other system requirements to achieve the desired anti-jam functionality were an accurate clock (for timed synchronization) and a microprocessor to add frequency hopping to existing radios.
Aircraft and ground radios that employ HAVE QUICK must be initialized with accurate time of day (TOD; usually from a GPS receiver), a word of the day (WOD), and a net identifier (providing mode selection and multiple networks to use the same word of the day). A word of the day is a transmission security variable that consists of six segments of six digits each. The word of the day is loaded into the radio or its control unit to key the HAVE QUICK system to the proper hopping pattern, rate, and dwell time.[2] The word of the day, time of day and net identifier are input to a cryptographic pseudorandom number generator that controls the frequency changes.
HAVE QUICK is not an encryption system, though many HAVE QUICK radios can be used with encryption; e.g. the KY-58 VINSON system. HAVE QUICK is not compatible with SINCGARS, the VHF - FM 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.
^"NATO C3 Board, AC/322-N/0815, "The NATO Joint Civil/Military Frequency Agreement (NJFA), ANNEXD 1, page 1-7, harmonised NATO band type 1"" (PDF). Archived from the original (PDF) on 2016-03-04. Retrieved 2016-11-16.
^Navy Training System Plan for the AN/ARC-182(V) Radio Set, N88-NTSP-A-50-8115D/A, March 2000, Section G.1.a.(3)
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