Raytheon NSC 18, User Manual

Page: 51 / 84

see
Figure: 2 − 18
Operator Manual
Raytheon Marine GmbH
Germany
R
NSC 18
RADAR
2 − 33
3748DOC020102 Edition: 14.JAN.2005
2.3.1.9 Pulse width selection
The pulse width toggle field allows selection of the desired transmitter pulse
width for the current range scale selected. If there is no pulse width toggle field,
this indicates that it is not available for the range currently being used.
Selecting this toggle field allows the pulse length to be switched e.g. from short
pulse to medium pulse and vice versa to optimize target discrimination with
respect to the selected range.
NOTE
Use of a longer pulse improves target reception but, at the same time,
increases clutter returns.
When a shorter pulse is used, reception of some weaker targets will
decrease, but clutter will also decrease, resulting in better target detection.
The available pulse width selections for the NSC display are illustrated in
Figure: 2
− 18.
SHORT pulse = 0.08 µ s
MED1 pulse = 0.3 µ s
MED2 pulse = 0.6 µ s
LONG pulse = 1.2 µ s
10Kw transceiver
6 ft. antenna
Information
A longer pulse width means;
more power, stronger targets returns but also more disturbances.
Long pulses are necessary in high ranges to detect small targets
more effectively.
Figure: 2 − 18 NSC pulse width