Ships Antennas

Ships Antenna Arrangement Consist of different transmitter and receiver antennas

Ships Antenna Arrangement

Ships Antenna ArrangementRDF loopRadarScannerVHF TX/RXNavtex RXLoran RXVHF DSC TXMF/HF Radio TelephoneVHF T/RX no. 2DSC RXE.B. Saturn 35 RadomeVHF DSC RXWatch keeping RX

Radio Wavelengths and FrequenciesPropagation Speed of Radio waves is equal to the speed of light.Aproximately 300,000 km/secOr 300,000,000 meters/sec

FormulaC = f x LambdaC = 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 degreesLambda = Wavelength = the distance from one wave top to another.

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

Unit of MeasurementHertzHzOrThe Unit used for measuring frequency is HERTZ, Symbolized by Hz

Example 11 THz (Terra Hz) = 1,000,000,000,000 Hz1 GHz (Giga Hz) = 1,000,000,000 Hz1 MHz (Mega Hz) = 1,000,000 Hz1 KHz (Kilo Hz) = 1,000 Hz

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

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

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

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

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

Find the wavelength for 2182 kHzL = C f L = 300,000,000 m/sec. 2,182,000 HzL = 137.49 m

Table of Wavelengths

ELF3 Hz 2 KHz100000 km 100 kmVLF3 KHz 30 KHz100 km 10 kmLF30 KHz 300 KHz10 km 1 kmMF300 KHz 3 MHz1 km 100 mHF3 MHz 30 MHz100 m 10 mVHF30 MHz 300 MHz10 m 1 mUHF300 MHz 3 GHz1 m 10 cmSHF3 GHz 30 GHz10 cm 1 cmEHF30 GHz 300 GHz1 cm 1 mm

Day

Direct WaveReflected WaveVHF

Reflected WaveGround WaveMF

HF8 Mhz16 Mhz

E- Layers EffectE - LayerF - LayerDAY

E- Layers EffectE - LayerF - LayerNIGHT

E- Layers EffectE - LayerF - Layer