1L118 and 1L117 Are modernised versions of the P37 BAR LOCK being sold for Air Traffic Control purposes - the company (Lianozovo Electromechanical Plant) will also upgrade your old P-37 to the modern electronics. They include Western SSR/IFF rather than the old 600 MHz soviet system. Interestingly the 1L117 has reverted to the P-20 Token V-beam height finding method and hence the back aerial is tilted at 45 degrees.

VARIANTS OF THE SERIES

US CODENAME	NATO CODENAME	PROJECT NAME	PROTOTYPE DESIGNATION	SERVICE DESIGNATION	INDUSTRIAL DESIGNATION
	Bar Lock A		P-35
			P-35M
	Bar Lock B		P-37
	Bar Lock C		P-37M
	Bar Lock D		P-37
					1L117
		Lira-1			1L118
				Anna

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