How to choose and buy a well-known brand antenna for receiving terrestrial television and radio signals in the sea
How to choose an omnidirectional TV antenna on a ship
The high-quality reception of terrestrial analog and digital signals in the open sea in order to provide ship communications, television and other types of communications with the outside world makes the highest demands on the appropriate receiving equipment, in particular marine omnidirectional antennas. The task of equipping movable objects with television equipment is of great importance in connection with Continue reading
Over the past 15 years, means of satellite Internet access have been rapidly developing on the high seas, beyond the reach of coastal communication networks.
For yachts and small vessels, dial-up became the first available – connection via satellite phones Globalstar, Inmarsat Mini-M, Iridium, Thuraya.
The cost of communication was high, the speed was measured not in megabytes, but in kilobits per second. Later VSAT compact (with a diameter of half a meter) antennas appeared, working with various Ku-band satellites; channel capacity reached 1 Mb / s, with the ability to transfer large volumes. Apart from a slight signal delay due to the large distance from the terminal to the satellite, Internet browsing Continue reading
Probably many people know that television satellites are in a geostationary orbit, which is a circular orbit located above the Earth’s equator (0 latitude), on which, an artificial satellite rotates around the planet with an angular velocity equal to the angular velocity of the Earth’s rotation around its axis, and constantly dwells on the same point on the earth’s surface. The satellites are located on the so-called polar arc (photo 1) at an altitude of approximately 36,900 km above sea level, the satellite’s altitude is not chosen randomly, but based on calculations of centrifugal force so that the satellite does not fall to the ground and does not fly into open space. So, a rotary antenna is a motorized antenna, designed in such a way that when moving it describes exactly the same arc as the one on which the satellites in space are located. Due to the Earth’s gravitational force and the centrifugal force that counteracts it, the satellites are stationary relative to the earth’s surface, so it’s enough to install a device (motor) to move the antenna along the given satellite Continue reading