Radar bacic components

Radar systems comprise three basic components:
A transmitter and a receiver unit, also called a transceiver, an antenna, also known as a scanner, and a display unit.
In many radar units the transceiver is located in the scanner.
Radar signals travel along the “line of sight”.
Therefore the detection of targets depends on the height of the radar scanner and the height of the target.
Marine radars operate either on the X-band frequency (9000 MHz), or on the S-band frequency (3000 MHz).
A shorter wavelength allows the use of smaller antennas, therefore on most small boats the radar used are in the X-band frequency.
However, S-band radar has an advantage – it can penetrate precipitation to a better degree, and therefore can detect targets which may be obscured in heavy rainfall.