radar performance calculator slide chart
Date: Copyright 1962
Inventory Number: 2004-1-0019
Classification: Slide Rule
Dimensions:0.3 × 25.4 × 11.4 cm (1/8 × 10 × 4 1/2 in.)
in sheath: 0.4 × 26.3 × 12.8 cm (3/16 × 10 3/8 × 5 1/16 in.)
Bibliography:Papers of Charles Grover Smith (10/28/1888-06/28/1969)
DescriptionClear plastic rule with 5 horizontal cardboard slides, each with separate scales. in paper sheath.
On one side, the five corresponding lines are marked A-E, while on the opposite side they are marked 1-5.
A(bottom): Re, Effective Range, -NM. logarithmic scale 1-1000. This is a fixed scale on the plastic frame.
B(top): V, Closing velocity, ft/sec. logarithmic scale 20-10.000
B(bottom): Tf, Frame Time, seconds. inverse logarithmic scale, 100-0.05
C(top): Operator Factor. Inverse logarithmic scale 1.0 - 0.05
D(top): [Rho], Range Correction Factor. logarithmic scale 0.4-1.6. This is a fixed scale on the plastic frame.
D(bottom): [Rho], Two scales: On the left, Range Correction Factor. logarithmic 0.4 - 1.6; On the right, Single Look Probability %. inverse logarithmic 100-0. These are fixed scales on the plastic frame.
E(top): Detection Range, NM. logarithmic scale, 5-500.
E(bottom): Semi-Active Range, NM. inverse logarithmic scale 100-1. This is a fixed scale on the plastic frame.
top edge: False Alarm Probability. Inverse
1(top): PT, Transmitter Peak Power. Inverse logarithmic scale, 100MW to 1W.
1(bottom): GT, Transmit Antenna Gain, dB. Linear scale 0-50.
2(top): GR Receive Atenna Gain, dB. linear scale 50-0.
2(bottom): d Transmitter Duty Cycle. Logarithmic scale, 0.001 - 1
3(top): [lambda] Wave Length, cm. inverse logarithmic scale, 1000 - 0.1
3(bottom): F Noise Figure - dB. linear scale, 30 to -20.
4(top): L System Loss -dB. Linear scale, 0-20
4(bottom): Time on Target -sec. logarithmic scale, 10^-7 to 10
5(top): Two scales. Left: PRF(pps) or Predetection Bandwidth (cps). inverse logarithmic scale 10.000 - 1; Right: n - Number of Pulses Integrated. logarithmic scale 1 - 5000
5(bottom): [sigma] Target Cross Section, Sq.Meters. logarithmic scale 0.01 - 10.000
bottom edge: R Range NM. logarithmic scale, 5 - 500.