[akdavis]

Originally Posted by Redwine

Completelly agree, but a battleship, or even a cruiser, or a land hill have a big surface....

Any way, we can live if the SD dont reach the exact real life behaviour, after all it is game, and cant be perfect.

My point is, may be... only may be, we must not to squeeze our brain attempting to "completelly" eliminate the surface contacts.

I think so.... we must be hapy, with the file above, we can recover the radar contacts using the V1.2 file instead the v1.1 !!!

I think we do need to squeeze our brains because 1. SD radar did not return a bearing and would not be useful for plotting surface contacts and 2. if SD radar is returning surface contacts at the ranges it could detect aerial contacts, it will far, far outperform SJ radar.

Here are some other stats I found:

DESCRIPTION AND USES:Long-wave aircraft warning sets. SD-a, SD-1, and SD-2 are installed on submarines and give range only. SD-3, for small auxiliaries, supplies range and bearing. All sets are equipped with "A" scopes, and have provisions for IFF (identification) connections.

PERFORMANCE:SD-a, SD-1 and SD-2, with antenna at 40' above water, have a reliable maximum range of 15 miles on medium bombers at 10,000' altitude. SD-3, with antenna at 80 ft. has a reliable maximum range of 25 miles on a medium bomber at 10,000'. Range accuracy is ± 500 yards. Bearing accuracy of SD-3 is ± 10°.

I suspect this data might be closer to real performance. Also bear in mind that all these stats are likely for the later versions of SD radar.

Here is data on the later SV radar (do we even have that in-game?) for comparison to SD early/late that it superceded:

Description.-An 8 cm. aircraft warning radar for use on submarines to supersede the SD.
SV-1 has instantaneous automatic volume control, fast time constant. Also uses SS indicating unit.

Number of operators.-One

Weight installed.-3,400 lb.

Power suppIy. 6 kva, 115 volts, 60 cps, 1 phase.

Maximum reliable range. (miles):
Bombers, at 30,000 ft 7.5
Bombers, at 10,000 ft 10
Fighters, at 10,000 ft 12
Battleships 12.5
Cruisers 15
Destroyers 10
Submarines, surfaced 7.5

Resolution: Range (yd.) 5.7 Bearing (deg.) 5

Accuracy: SV SV-1 Range (yd.) +-(50+0.1%). 15+-1%. Bearing (deg.) +-2. 1/2.

Minimum range (yd.) 400. 400.

Indication and data output:
Range: SV uses SJ-1 indicator (5 inch A scope with 10, 30 mi. ranges). SV-1 uses SS range indicator (3 inch A scope 10, 30 mi. ranges).
Bearing: SV-1 uses SS bearing indicator (3 inch B scope with 4,000 yd. range).
P.P.I.: 5-inch scope. Provision for four radar repeaters.
Ranges: 4, 10, 40 miles on SV; 4, 10, 20, 80 miles on SV-1
Other: Provisions for IFF trigger and display.

Antenna specifications:
Total weight (lb.) 500 including pedestal but not torque tube.

Feed: Wave guide.

Reflector:
Type Slotted csc2 parabola.
Size 2 ft. high x 4 ft. wide.

H.P. beam width:
Horizontal - 5.5 degrees.
Vertical - 60 degrees.
Polarization - Horizontal.
Gain (db) - 30.
Scan - 360 degrees at 0 to 6 r.p.m. by motor. D-c motor control.

Transmitter specifications:

Frequency (Mc.) 3400-3700.
R-f Source - Magnetron.
R-f Lines - Wave guide.
Pulser type - Nonlinear coil.
R-f peak power (kw) - 500.
R-f average power - SV-0.2; SV-1-0.15.(kw).
Pulse rates (pps) - SV-300 +-5%; SV-1-300 +-5%.
Pulse length (micro sec) - 1.