Editing Saab 37 Viggen (section)

====JA 37====
The JA 37 fighter interceptor, introduced in 1979, featured the Ericsson PS 46/A radar which was capable of guiding the medium-range [[semi-active radar homing]] RB 71 ''[[Skyflash]]'' air-to-air missiles. Both the RB 71 and the PS 46/A radar were designed to provide the Viggen with a [[look-down/shoot-down]] capability and to engage targets at [[Beyond-visual-range missile|beyond visual range]] distances.<ref name="auto" /> The JA 37 could carry up to two RB 71s on the inner wing pylons; in a typical air defense loadout, these would typically have been combined with four [[AIM-9 Sidewinder|RB 24J]] air-to-air missiles, a more capable and newer version of the Sidewinder missile than employed on earlier Viggen variants.<ref name= "auto" />

Following the evaluation of several alternative cannons, including the British [[ADEN cannon]], the American [[M61 Vulcan]], and French [[DEFA cannon]], an [[Rheinmetall Air Defence|Oerlikon]] [[Oerlikon KCA|KCA]] 30mm cannon was selected for the JA 37. The KCA was carried, along with 126 rounds of ammunition, in a conformal pod under the fuselage.<ref name= "auto" /> The firing rate of the cannon was selectable at 22 or 11 rounds per second.  It fired the same cartridge as the [[GAU-8]], reportedly 50% heavier shells at a higher velocity than the ADEN cannon, resulting in six and a half times the kinetic energy on impact, and was effective up to 2,000 meters.<ref name="Jackson p76-77">Jackson 1993, pp. 76–77.</ref><ref>Warwick 1980, pp. 1264–65.</ref> This, in conjunction with the fire control system, allowed air-to-air engagements at longer range than other fighters.<ref name = "warwick 1265">Warwick 1980, p. 1265.</ref><ref name="williams p57">Williams and Gustin 2004, p. 57.</ref>

Perhaps the most important improvement was the expanded [[STRIL]] datalink which entered service in 1982–85. It allowed not only ground control-aircraft communication, but also between up to four aircraft simultaneously regardless if airborne or on the ground. Datalink information was displayed on the Horizontal Situation Display and a tactical display, the latter using link symbology that could be overlaid with an electronic map on a multifunction display.<ref>Dario Leone, [https://theaviationgeekclub.com/viggen-vs-blackbird-swedish-air-force-ja-37-fighter-pilots-able-achieve-radar-lock-legendary-sr-71-mach-3-spy-plane/  Viggen vs Blackbird: how Swedish Air force JA-37 fighter pilot were able to achieve radar lock on the legendary SR-71 Mach 3 spy plane], The aviation geek club, 9th of January 2018.</ref><ref>"In 1985, the fighter-to-fighter data link became operational, allowing the aircraft to share targeting and weapon information. Improvements continued into the 1990s, with a multi-target tracking capability becoming operational in 1990 and automatic gun aiming being introduced to the aircraft in 1992." Putnikov, M. 2013. Saab 37 Viggen Walk Around. Carrollton, TX: Squadron Signal Publications. p. 60</ref>