OVERVIEW:  The TROUT CHEEK aka Feniks-M aka MG-10  is an active/passive submarine sonar
 operating in the high sonar frequency band.

DETAILS:  Derived from the WWII-era German "Balcon" array.  The Feniks is a modernization of the earlier Phoenix sonar used in WHISKEY-class submarines, updated with an automatic target tracking mode (Kola) and increased sensitivity.  It uses a Hercules MG-15 as the active sonar component of the system.

Specifications (estimated, based on AN/BQR-2) :
	Frequency: 	0.5-15 kHz
	Range, passive:	15-20 nm (v. snorkeling submarine)

			
NOTES:  IOC 1959 (MG-10); early 1960's (MG-10M).  Called SHARK TEETH when deployed on early Soviet nuclear submarines. Reportedly similar in capability to the American AN/BQR-2.  


SOURCES: Friedman, The Naval Institute Guide to World Naval Weapons Systems 1997-98, pg. 604, 622 ; "At the forefront of the underwater confrontation: submarine hydroacoustics. From the beginning of the cold war to the 70s." Top War. Last modified August 7, 2020. https://en.topwar.ru/173865-na-ostrie-podvodnogo-protivostojanija-gidroakustika-podlodok-ot-nachala-holodnoj-vojny-do-70-h.html.
