Hi Bruce.
The RCA HAA units had a 3-ton truck set up with a 53-Set and receiver, along with a couple of switchboard systems and a bunch of multiphone??? equipment. Not sure what that latter stuff is, but I think the premise of the vehicle was to coordinate incoming target information and distribute it to the HAA batteries in the vehicles area of control.
I think the 53-Set was strictly a made in England item, but could Canadian companies have still been given orders to make kits for it, to fulfill requirements for the Canadian Army? They could still have labeled the kits as Canadian make.
Just guessing out loud.
David
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