ship’s antennas

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Ship’s Antennas Ship’s Antennas

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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. - PowerPoint PPT Presentation

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Page 1: Ship’s Antennas

Ship’s AntennasShip’s Antennas

Page 2: Ship’s Antennas

Ship’s Antenna Ship’s Antenna ArrangementArrangement

Consist of different transmitter and Consist of different transmitter and receiver antennasreceiver antennas

Page 3: Ship’s Antennas

Ship’s Antenna Ship’s Antenna ArrangementArrangement

Page 4: Ship’s Antennas

Ship’s Antenna Ship’s Antenna ArrangementArrangement

RDF loop

RadarScanner

VHF TX/RX

Navtex RXLoran RX

VHF DSC TX

MF/HF Radio TelephoneVHF T/RX no. 2

DSC RX

E.B. Saturn 35 Radome

VHF DSC RXWatch keeping RX

Page 5: Ship’s Antennas

Radio Wavelengths and Radio Wavelengths and FrequenciesFrequencies

Propagation Speed of Radio waves is Propagation Speed of Radio waves is equal to the speed of light.equal to the speed of light.

Aproximately 300,000 km/secAproximately 300,000 km/secOr 300,000,000 meters/secOr 300,000,000 meters/sec

Page 6: Ship’s Antennas

FormulaFormulaC = f x LambdaC = f x Lambda

C = Propagation speed of radio C = Propagation speed of radio waves(Speed of light)waves(Speed of light)

f = Frequency = Period of cycle. The f = Frequency = Period of cycle. The time it takes for a wave to move time it takes for a wave to move from zero to 360 degreesfrom zero to 360 degrees

Lambda = Wavelength = the distance Lambda = Wavelength = the distance from one wave top to another.from one wave top to another.

Page 7: Ship’s Antennas

Lambda = Wavelength = the distance Lambda = Wavelength = the distance from one wave top to another.from one wave top to another.

f = Period of cycle. The time it takes f = Period of cycle. The time it takes for a wave to move from zero to for a wave to move from zero to 360 degrees360 degrees

Page 8: Ship’s Antennas

Unit of MeasurementUnit of Measurement

HertzHertz

HzHzOr

The Unit used for measuring frequency is HERTZ, Symbolized by Hz

Page 9: Ship’s Antennas

Example 1Example 11 THz (Terra Hz) = 1,000,000,000,000 1 THz (Terra Hz) = 1,000,000,000,000

HzHz1 GHz (Giga Hz) = 1,000,000,000 Hz1 GHz (Giga Hz) = 1,000,000,000 Hz1 MHz (Mega Hz) = 1,000,000 Hz1 MHz (Mega Hz) = 1,000,000 Hz1 KHz (Kilo Hz) = 1,000 Hz1 KHz (Kilo Hz) = 1,000 Hz

Page 10: Ship’s Antennas

Example 2Example 2Ch 70 Ch 70

= = 156.525 MHz 156.525 MHz

= = 156,525 KHz 156,525 KHz

= = 156,525,000 Hz156,525,000 Hz

Page 11: Ship’s Antennas

Example 3Example 3Convert 125 MHz to kHzConvert 125 MHz to kHz

==

125 000 kHz125 000 kHz==

125 000 000 Hz125 000 000 Hz

Page 12: Ship’s Antennas

Example 4Example 4Convert 12.5 MHz to HzConvert 12.5 MHz to Hz

==

12 500 kHz12 500 kHz==

12 500 000 Hz12 500 000 Hz

Page 13: Ship’s Antennas

Find the wavelength for VHF Find the wavelength for VHF ch. 70 (156.525 Mhz)ch. 70 (156.525 Mhz)

L = L = CC f f

L = L = 300,000,000 m/sec.300,000,000 m/sec.156,525,000 Hz156,525,000 Hz

L = 1.92 metersL = 1.92 meters

Page 14: Ship’s Antennas

Find the frequency if Find the frequency if wavelength is 600 meters.wavelength is 600 meters.

f = f = CC L L

f = f = 300,000,000 m/sec.300,000,000 m/sec.600 m.600 m.

f = 500,000 Hzf = 500,000 Hz

Page 15: Ship’s Antennas

Find the wavelength for 2182 Find the wavelength for 2182 kHzkHz

L = L = CC f f

L = L = 300,000,000 m/sec.300,000,000 m/sec.2,182,000 Hz2,182,000 Hz

L = 137.49 mL = 137.49 m

Page 16: Ship’s Antennas

ELFELF 3 Hz – 2 KHz3 Hz – 2 KHz 100000 km – 100 100000 km – 100 kmkm

VLFVLF 3 KHz – 30 KHz3 KHz – 30 KHz 100 km – 10 km100 km – 10 kmLFLF 30 KHz – 300 KHz30 KHz – 300 KHz 10 km – 1 km10 km – 1 kmMFMF 300 KHz – 3 MHz300 KHz – 3 MHz 1 km – 100 m1 km – 100 mHFHF 3 MHz – 30 MHz3 MHz – 30 MHz 100 m – 10 m100 m – 10 mVHFVHF 30 MHz – 300 30 MHz – 300

MHzMHz10 m – 1 m10 m – 1 m

UHFUHF 300 MHz – 3 GHz300 MHz – 3 GHz 1 m – 10 cm1 m – 10 cmSHFSHF 3 GHz – 30 GHz3 GHz – 30 GHz 10 cm – 1 cm10 cm – 1 cmEHFEHF 30 GHz – 300 30 GHz – 300

GHzGHz1 cm – 1 mm1 cm – 1 mm

Table of WavelengthsTable of Wavelengths

Page 17: Ship’s Antennas

F2-layer

Day

D-layer

Night

F1-layerE-layer

Page 18: Ship’s Antennas

TX RXDirect Wave

Reflected Wave

VHFVHF

Page 19: Ship’s Antennas

TX RX

Reflected Wave

Ground Wave

MFMF

Page 20: Ship’s Antennas

TX

HFHF

8 Mhz 16 Mhz

Page 21: Ship’s Antennas

TX

E- Layer’s EffectE- Layer’s Effect

E - Layer

F - Layer

DAY

Page 22: Ship’s Antennas

TX

E- Layer’s EffectE- Layer’s Effect

E - Layer

F - Layer

NIGHT

Page 23: Ship’s Antennas

TX

E- Layer’s EffectE- Layer’s Effect

E - Layer

F - Layer