Historical scope markings:
Indication and data output:
Range: 5-inch A-scope with range step and dial. Main Sweep: 60,000 yd. Expanded Sweep 20,000 yds. Precision sweep on 40,000 yds. 1,500 yds. either side of mark.
PPI: A 5-inch PPI is provided with SJ-a and SJ-1
Ranges: 8,000, 20,000, 80,000 yd. 160,000 yd. delayed sweep.
Other: Provisions for IFF indication are present.
http://www.maritime.org/radio-sj.htm