User's Manual Part 1

see
Figure: 2−18
Operator Manual
Raytheon Marine GmbH
Germany
R
NSC 18
RADAR
2−33
3748DOC020102Edition: 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 = 0.08µs
MED1 pulse = 0.3µs
MED2 pulse = 0.6µs
LONG pulse = 1.2µs
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