ship’s antennas
DESCRIPTION
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 PresentationTRANSCRIPT
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Ship’s AntennasShip’s Antennas
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Ship’s Antenna Ship’s Antenna ArrangementArrangement
Consist of different transmitter and Consist of different transmitter and receiver antennasreceiver antennas
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Ship’s Antenna Ship’s Antenna ArrangementArrangement
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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
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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
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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.
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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
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Unit of MeasurementUnit of Measurement
HertzHertz
HzHzOr
The Unit used for measuring frequency is HERTZ, Symbolized by Hz
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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
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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
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Example 3Example 3Convert 125 MHz to kHzConvert 125 MHz to kHz
==
125 000 kHz125 000 kHz==
125 000 000 Hz125 000 000 Hz
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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
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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
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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
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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
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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
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F2-layer
Day
D-layer
Night
F1-layerE-layer
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TX RXDirect Wave
Reflected Wave
VHFVHF
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TX RX
Reflected Wave
Ground Wave
MFMF
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TX
HFHF
8 Mhz 16 Mhz
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TX
E- Layer’s EffectE- Layer’s Effect
E - Layer
F - Layer
DAY
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TX
E- Layer’s EffectE- Layer’s Effect
E - Layer
F - Layer
NIGHT
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TX
E- Layer’s EffectE- Layer’s Effect
E - Layer
F - Layer