"SJ" and "SD" radar - what does it stand for?

[Raptor1]

Originally Posted by Able72

Wow, some of you guys know more history about military equipment than a sane human being should

Being a sane human must be boring then...

Anyway, Nisgeis, I think your right about the S standing for Search and the other letter standing for the model number, but the earliest type of US Shipborne Search Radar used in WWII was called the CXAM (Though I think the CXAM-1 was more widespread), which was introduced before the S models, What did that stand for?