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Ship’s Antennas

Ship’s Antennas. Ship’s Antenna Arrangement. Consist of different transmitter and receiver antennas. Ship’s Antenna Arrangement. Ship’s Antenna Arrangement. Watch keeping RX. Radar Scanner. VHF DSC RX. E.B. Saturn 35 Radome. DSC RX. VHF T/RX no. 2. MF/HF Radio Telephone. RDF loop.

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Ship’s Antennas

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  1. Ship’s Antennas

  2. Ship’s Antenna Arrangement • Consist of different transmitter and receiver antennas

  3. Ship’s Antenna Arrangement

  4. Ship’s Antenna Arrangement Watch keeping RX Radar Scanner VHF DSC RX E.B. Saturn 35 Radome DSC RX VHF T/RX no. 2 MF/HF Radio Telephone RDF loop VHF DSC TX Loran RX VHF TX/RX Navtex RX

  5. Radio Wavelengths and Frequencies • Propagation Speed of Radio waves is equal to the speed of light. • Aproximately 300,000 km/sec Or 300,000,000 meters/sec

  6. Formula C = f x Lambda C = Propagation speed of radio waves(Speed of light) f = Frequency = Period of cycle. The time it takes for a wave to move from zero to 360 degrees Lambda = Wavelength = the distance from one wave top to another.

  7. Lambda = Wavelength = the distance from one wave top to another. f = Period of cycle. The time it takes for a wave to move from zero to 360 degrees

  8. Unit of Measurement Hertz Or Hz The Unit used for measuring frequency is HERTZ, Symbolized by Hz

  9. Example 1 1 THz (Terra Hz) = 1,000,000,000,000 Hz 1 GHz (Giga Hz) = 1,000,000,000 Hz 1 MHz (Mega Hz) = 1,000,000 Hz 1 KHz (Kilo Hz) = 1,000 Hz

  10. Example 2 Ch 70 = 156.525 MHz = 156,525 KHz = 156,525,000 Hz

  11. Example 3 Convert 125 MHz to kHz = 125 000 kHz = 125 000 000 Hz

  12. Example 4 Convert 12.5 MHz to Hz = 12 500 kHz = 12 500 000 Hz

  13. Find the wavelength for VHF ch. 70 (156.525 Mhz) L = C f L = 300,000,000 m/sec. 156,525,000 Hz L = 1.92 meters

  14. Find the frequency if wavelength is 600 meters. f = C L f = 300,000,000 m/sec. 600 m. f = 500,000 Hz

  15. Find the wavelength for 2182 kHz L = C f L = 300,000,000 m/sec. 2,182,000 Hz L = 137.49 m

  16. Table of Wavelengths

  17. E-layer F1-layer D-layer F2-layer Night Day

  18. TX RX VHF Direct Wave Reflected Wave

  19. TX RX MF Reflected Wave Ground Wave

  20. TX HF 8 Mhz 16 Mhz

  21. TX E- Layer’s Effect F - Layer E - Layer DAY

  22. TX E- Layer’s Effect F - Layer E - Layer NIGHT

  23. TX E- Layer’s Effect F - Layer E - Layer

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