121 Electronic projects

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6 Antenna efficiency Antenna efficiency is of particular importance in all communications systems. If the efficiency of an antenna drops to 50%, the maximum radiated signal also drops resulting in a consequent loss of range. It would be rare indeed to find any system that is 100% efficient and antennae are no exception. However, antenna losses are well documented and, consequently, the effective isotropic radiated power (EIRP) figure for a system is usually calculated with reference to known efficiency figures.

Frequency of transmission. e. depth sounding or Doppler speed log. Angle of incidence of the propagated beam. The closer the angle to vertical the greater will be the energy reflected by the seabed. 1 A linear graph produced by plotting absorption loss against frequency. 4% at 15°C. 1 Attenuation and choice of frequency The frequency of the acoustic energy transmitted in a sonar system is of prime importance. To achieve a narrow directive beam of energy, the radiating transducer is normally large in relation to the wavelength of the signal.

Other operation detail is as shown in the diagram. What is not indicated on the display is the change of pulse length and period as selected by range. 14). All the selected modes display data as a window insert on top of the echo sounder NAV mode display. There are four display-mode areas. ᭹ ᭹ ᭹ ᭹ OS DATA mode. Indicates own ship position, GPS derived course, time and a digital display of water depth. DBS mode. Provides a draft-adjusted depth mode for referencing with maritime charts. LOGBOOK mode.

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