Transcript 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
VHF DSC RX
Scanner
E.B. Saturn 35
Radome
DSC RX
VHF T/RX no. 2
MF/HF Radio Telephone
RDF loop
VHF DSC TX
Loran RX
Navtex RX
VHF
TX/RX
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
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.
f = Period
of cycle. The
time
it takes
for
Lambda
= Wavelength
= the
distance
from
wave
top to from
another.
a one
wave
to move
zero to 360
degrees
Unit of Measurement
Hertz
Or
Hz
The Unit used for measuring frequency is HERTZ,
Symbolized by Hz
Example 1
1
1
1
1
THz (Terra Hz) = 1,000,000,000,000 Hz
GHz (Giga Hz) = 1,000,000,000 Hz
MHz (Mega Hz) = 1,000,000 Hz
KHz (Kilo Hz) = 1,000 Hz
Example 2
Ch 70
=
156.525 MHz
=
156,525 KHz
=
156,525,000 Hz
Example 3
Convert 125 MHz to kHz
=
125 000 kHz
=
125 000 000 Hz
Example 4
Convert 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 kHz
L=C
f
L = 300,000,000 m/sec.
2,182,000 Hz
L = 137.49 m
Table of Wavelengths
ELF
3 Hz – 2 KHz
100000 km – 100 km
VLF
3 KHz – 30 KHz
100 km – 10 km
LF
30 KHz – 300 KHz
10 km – 1 km
MF
300 KHz – 3 MHz
1 km – 100 m
HF
3 MHz – 30 MHz
100 m – 10 m
VHF
30 MHz – 300 MHz
10 m – 1 m
UHF
300 MHz – 3 GHz
1 m – 10 cm
SHF
3 GHz – 30 GHz
10 cm – 1 cm
EHF
30 GHz – 300 GHz
1 cm – 1 mm
E-layer
F1-layer
D-layer
Night
F2-layer
Day
VHF
TX
Direct Wave
RX
Reflected Wave
MF
Reflected Wave
Ground Wave
TX
RX
HF
8 Mhz
16 Mhz
E- Layer’s Effect
F - Layer
E - Layer
DAY
E- Layer’s Effect
F - Layer
E - Layer
NIGHT
E- Layer’s Effect
F - Layer
E - Layer