OVERVIEW:  The MR-90 aka Orekh aka FRONT DOME radar is a shipborne guidance tracker/illumination radar operating in the NATO H/I- band (IEEE X-Band).

DETAILS:   The FRONT DOME  radar is the illumination radar for the  SA-N-7 “Gadfly” SAM. It is a pulse-Doppler radar with continuous-wave illumination.    Each designator uses a different frequency and provides one channel of fire-control. Up to three designator channels can be used used simultaneously against individual high-threat targets.	It can track two targets if in close proximity to each other.	


Specifications:

	Frequency:	8-10 GHz (approx) (I-band (NATO))
	PRF:		??
	Pulse width:	??
	Power: 		 ?? kW (peak)
	Scan Limits:	0-70 ° elevation.
	Range:		40 nm.  30 meter minimum altitude.
			
NOTES:  IOC 1983.  Used aboard Russian and PRC `Sovremenny' class destroyers ,  Indian `Delhi' class destroyers and `Talwar' class frigates.

SOURCES: "MR-90 “Front Dome” - Radartutorial." Grundlagen Der Radartechnik. Accessed May 11, 2022. https://www.radartutorial.eu/19.kartei/11.ancient4/karte022.en.html. ; 
"Uragan." Encyclopedia Astronautica. Accessed May 11, 2022. https://www.astronautix.com/u/uragan.html. ;  Jane's Radar and Electronic Warfare Systems 2002-2003 "Front Series Missile Guidance Radars, dtd 02 July 2001; Friedman, The Naval Institude Guide to World Naval Weapons Systems 1997-98, pg. 336. ; "Radar and Electronic Warfare Systems Handbook Issue 1." Defence News, Analysis, Data and Market Forecasting | Shephard. Accessed May 14, 2022. https://handbooks.shephardmedia.com/view/197110285/54/


