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Originally Posted by Nisgeis
Any number after the S<letter> system is a modification. So, SJ-1 is the first modification to the SJ radar set, which increased range.
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Kind of. Any number following the two-letter prefix denoted a factory modification. A lower-case letter denoted a field modification. In reference to WWII radar, SJ-a was a field-modified SJ radar set modified with a PPI screen, and likewise SD-a was an improved version of the original SD (what is known as "improved SD radar" in SH4).