OVERVIEW:  The 26Sh-1 IRST (Infrared Search and Track) is a passive airborne sensor that detects infrared radiation.

DETAILS: 
 The IRST provides a passive search capability for use in a high ECM environment.  Additionally, when used with an IR missile, it allows for a surprise/no notice passive interception capability. However, the IRST is partially attenuated by atmospheric conditions.  Also, it has a shorter range than radar, although its angular resolution is superior.


Specifications:

	Frequency:	Infrared
	Range:		?? nm search at high altitude vs. bomber
			27 nm search at high altitude vs. fighter, tail aspect, 				afterburner
			13 nm search at medium altitude vs. fighter, tail aspect, 			afterburner
			6 nm search at low altitude vs. fighter, tail aspect, 			afterburner
	Arc:		60 degrees azimuth, 15 degrees elevation, 6 degree/sec tracking
			


NOTES:  Used in MiG-25PD.
 

SOURCES: Mladenov, Alexander. Soviet Cold War Fighters. Fonthill Media, 2017, location 3868;(Kindle ed.) 

