So now I've managed to mess up the quote ?With regard to the radar, I have managed to do a bit more digging. The first proposal for a Frequency Scanning Radar is made by ASRE in 1957 and was for a 30ft x 30ft rotating array with a peak transmitter power of 2.5MW. The NIGS arrays were fixed and there would have been four per ship. Based on an ASWE report from 1961, they would have actually been 20ft wide and 15ft high (I was wrong again) with 88 phase changers, 88 frequency scanners and a feed line with 88 outputs. They would have been able to handle a peak power input of 2.5MW. R&D work seems to slow down with abandonment of NIGS but does not completely stop, in 1963 a report is commissioned from someone at Leeds University to look at high power ferromagnetic phase shifters. Later, in 1968 a large (6ft x 6ft based on photos) stacked phase shifting planar array is built and used to test mechanical and electrically controlled ferrite phase shifters. My radar knowledge is weak but the concept seems to have moved on and is now described as Phase Scanning. A peak power upto 4MW is referenced for this design.
My guess there is that the Navy was examining its' options and trying to figure out exactly what it wanted from a cruiser and from its' guided missiles.Why where the Navy looking at essentially 3 different systems at the same time (Sea Slug with 985, R.F with Trackwell, Bristol Blue Envoy with 984 & TIAs)