Не знаю когда точно эти радары поставили на "семерки". Очередные модификации "С-радаров" у них уже были "в строю" с 1942г. 10-сантиметрового диапазона, 1-4 мегаГц. Могли обнаружить НК в 15 милях и ПЛ в 5 милях. Вооружали ими "малые корабли". Эсминец малым кораблем сложно обозвать, но на чертежах эсминцев(эскортных), как видно, они присутствуют.
Вот коротенько, оригинал:
S-Band Navy Search
After the 10 cm experimental breadboard demonstration, the Navy requested an S-band search radar for shipboard and airborne applications. Under the leadership of Ernest Pollard, the 50 kW SG shipboard set was given sea trials in May 1941, followed by the ASG version for large patrol aircraft and Navy blimps. With a gyro-stabilized mount, the SG could detect large ships at 15 miles and a submarine periscope at 5 miles. About 1,000 of these sets were built. ASG was designated AN/APS-2 and commonly called "George"; some 5,000 of these were built and found to be very effective in submarine detection.
A compact version of the SG for PT boats was designated the SO. These were introduced in 1942. Other variants were the SF, a set for lighter warships, the SH for large merchant vessels, and the SE and SL, for other smaller ships. The Navy also adopted versions of the Army's SCR-584 (without the M-9 unit but with gyro-stabilizers) for shipboard search radars, the SM for Fleet carriers and the SP for Escort carriers. None of these were produced in large quantities, but were highly useful in operations.
The BTL developed the SJ, an S-Band supplement for the SD meter-wave radar on submarines. The antenna for the SJ could sweep the horizon to about 6 miles with good accuracy. Late in the war, the improved SV increased detection ranges to 30 miles.