16 JAN 44
NSTR - Nothing Significant To Report. Repairs to superstructure continue. Anyone aboard Princeton this day didn’t know it but as they gazed out at the activity in the Southeast Loch and Pearl Harbor’s channel, they were witnessing the movement of multiple vessels that would play significant roles — Enterprise already had a gloried record — in what would be the largest naval campaign in history:
“At 1235 U.S.S ENTERPRISE got underway and stood out. At 1415 U.S.S. BELLEAU WOOD, U.S.S. COWPENS, U.S.S. ESSEX, and U.S.S. INTREPID got underway and stood out.”
Nerd Alert! Recall the photo of Princeton and our discussion of the superstructure damage on 1/11/44. Princeton possessed the SC-2 and the SG Microwave radars. I would ask that you glance briefly at the information below, if only to digest the range capability of Princeton’s radars. I think this may be helpful in understanding the coordination, communication and response to enemy threats in the days, months and battles to come.
SC, SC-1, SC-2 and SC-3 Long Wave Search for Destroyers and Larger
SC-2 on Destroyer [inset: receiver-indicator].
DESCRIPTION AND USES:
Long wave search sets, installed on destroyers and larger ships to search for planes and surface vessels and for control of interception. All sets have an "A" scope, provision for IFF connections, and work with a gyro-compass repeater. SC-2 and SC-3 also have PPI scopes, remote PPI's, and built-in BL and BI* antennas.
PERFORMANCE:
With antennas at 100', SC and SC-1 (without preamplifier) have a reliable maximum range of 30 miles on medium bombers at 1,000' altitude. With preamplifier, SC-1's range is extended to 75 miles -- the same as that of SC-2 and SC-3. Range accuracy of SC is ± 200 yards; later models have an accuracy of ± 100 yds. bearing accuracy of SC and SC-21 is ± 5°; of SC-2 and SC-3, ± 3°. There is no elevation control on any of the sets, but height can be estimated roughly from positions of minimum signal strength.
TRANSPORTABILITY:
Shipment includes spares for each set. If separate generator is needed, it is included in shipment. Not air transportable.
INSTALLATION:
Both SC and SC-1 have 5 components weighing a total of 1800 lbs. SC-2 has 6 components weighing a total of 3,000 pounds. Weights and dimensions of antenna assemblies are 450 lbs. 6'111/2" x 8'6" for SC and SC-1; 478 lbs. 4'6" x 15' for SC-2 and SC-3. Antennas should be mounted as high as possible, preferably 100 feet or more, above other superstructures.
PERSONNEL:
One operator per shift is minimum on all 3 sets.
POWER:
SC and SC-1 require primary power of 1500 watts at 115 volts, 60 cycles. SC-2 and SC-3 require 2500 watts at 115 volts, 60 cycles. All sets use ship's power of 115 volts, 60 cycles; transformer, if ship's power is 440 volts AC or 220 volts AC; motor generator if ship's power is DC.
SG Microwave Search Set for destroyers and Larger
SG on Destroyer.
DESCRIPTION AND USES:
Microwave search set installed on destroyers and larger ships to search for enemy surface ships, to coordinate attack by surface vessels, and to aid in navigation. Furnishes range and bearing on PPI and "A" scopes. SG has provisions for IFF (identification) connections, and equipment is being supplied for connecting to remote PPI's.
PERFORMANCE:
Reliable maximum range is 15 miles on large ships; with antenna height of about 100 feet. Range accuracy is ± 100 yds. Azimuth accuracy: ± 2°.
TRANSPORTABILITY:
Complete shipment includes spares and testing equipment, and is crated in 15 units weighing about 4289 lbs. Largest package is 13'4" x 12" x 10" and weighs 359 lbs. Heaviest package (1425 lbs.) is 28" x 41" x 80".
INSTALLATION:
SG has 5 components weighing approximately 2200 lbs. Heaviest unit (1180 lbs.) is the transmitter-receiver -- 737/8" x 34" x 223/8". Antenna, which weighs 350 lbs. with pedestal and measures 44" x 491/2" in diameter, should be mounted as high as possible, preferably more than 100 feet above water and above adjacent superstructure.
PERSONNEL:
One man per shift is minimum requirement.
POWER:
Primary power required is 115 volts, 60 cycles: 2.8 KVA. Source is ship's main line.
Thank you for your time and attention!
NNNN
(NNNN is the Basic Military Message indicator that means “end-of-message” … please make a note of it. :-)
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