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John D Salt

Of the FC radars associated with S-60, SON-4 and SON-9 are towed equipments copied from US lend-lease kit, and seem to look pretty smilar, but SON-50 is vehicle mounted.

http://users.sch.gr/dlabaditis/TH/radars/index.htm says:

SON-4, “Whiff”, SCR-584 copy. “Dish is placed on the back of the roof. Wheel arches running the full width of the caravan near the rear of the caravan”.

SON-9, “Fire Can”. “Different dishes: 5,7,10 spokes & solid. Dish is placed on the front of the roof. Cut-out type wheel arches right at the rear of the caravan.”

SON-50 (RPK-1), “Flap Wheel”, picture shows a solid dish radar on top of a truck body on what looks like an Ural-375 chassis. Googling RPK-1 gets several piccies.

https://www.militaryfactory.com/armor/detail.asp?armor_id=163 says the towing vehicle for S-60 and associated FC equipment was Ural-375.

All the best,