Indicator Resolution; Short Range Displays - Telephonics RDR-1600 Pilot's Manual

Weather Operations (Cont.)

6.5.9 Indicator Resolution

The resolution of the indicator depends on the number of display bits on the
screen. A typical screen matrix is composed of 256 bits horizontally by 256
bits vertically. The display resolution is equal to 1/256 times the display
range as shown in Table 6.5.9-1. The lower the range, the better the
resolution.
Table 6.5.9-1. Minimum Distinguishable Target Separation
Range (nm) Miles
2.0 0.008
5.0 0.02
10.0 0.04
20.0 0.08
40.0 0.16
80.0 0.31
26 RDR-1600 Pilot's Guide
Resolution
Feet Meters
48 14.8
122 37.0
243 74.1
486 148.2
972 296.3
1884 574.1
TM106101(8/01)

6.5.10 Short Range Displays

The RDR-1600 allows the selection of full-scale ranges of 1.0 nm and
0.5 nm in Search Modes.
These unique short range selections are especially useful during
approaches and surveillance operations, because it keeps the target from
getting lost in the clutter at the vertex of the display.
When operating in either short range mode, certain features become
unavailable. They are: Moving Map with Waypoints, BeaconTrac and
Beacon Identification. All other modes are still accessible.
Figure 6.5.10-1. Short Range Display
In the weather mode, the RDR-1600 is unable to ascertain radar returns
from close in. On the short range displays, the RDR-1600 paints a red arc
in this range to depict the dead band area, as shown in Figure 6.5.10-1.
RDR-1600 Pilot's Guide
TM106101(8/01)
Weather Operations (Cont.)
27