The importance of antennas and how they are made. Performance and power delivery.
A radio equipment is as good as its antenna. It is a maxim of communications by VHF or BLU. And taking into account that these teams are fundamental nautical emergencies, having the proper antenna requires discarding those economic sticks which only adorn the gunwale of the boat without greater utility.
An antenna is a set of wire or brass pipes, receivers of radio waves coming from all directions, and they connect to the VHF through a coaxial cable and a connector or plug, sometimes welded to coax or other pressed him.
Some antennas have a series of welded copper elements one after another in collinear order: the more of these there are, the greater the radiated power. And higher installation, increase the reach to the horizon.
The decibel or dB is a measure used to indicate the profit and the increase in the power output of the VHF antenna. For example, 3 dB equals twice the output power; 6 dB, on the other hand, equal to 4 times that power. Other antennas, manufactured with radiating elements of spirals of copper of variable width, have a power output of 6 dB, poermite listen to great distances. A quality antenna focuses radio waves that are lost up on a low trajectory in the direction of the horizon up to 18 miles.
But if you replace an antenna of the whip of one handheld VHF with another of three meters in height with its connectors adapter corresponding, you will need a remarkable improvement in scope and power.
The performance of an antenna that is tell the delivered power – is done with a special instrument called a SWR or Standing Wave Ratios. When the measure yields a 3:1 performance is bad, when the measure is 1, 5:1 or less, is very good.
At the time of buying an antenna for fishing, know these measurement values and the materials used in their construction, they ensure a good choice.
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