reference antenna การใช้

• First the reference antenna's performance is measured using high accuracy measurement facility.
• Sometimes rather than measure the performance of the reference antenna theoretical methods are used.
• The second antenna is a reference antenna, which points rigidly at the first antenna.
• That ratio would be equal to G if the reference antenna were an isotropic radiator.
• In a common usage scenario a reference antenna would be used as a transfer standard.
• Reference antennas are built with particular care taken to make them simple, robust and repeatable.
• In this case the reference antenna is built to have a high degree of repeatability in its radiation pattern and efficiency.
• The reference antenna is usually the theoretical perfect isotropic radiator, which radiates uniformly in all directions and hence has a directivity of 1.
• That field strength is compared to the field strength found using a so-called " reference antenna " at the same distance receiving the same power in order to determine the gain of the antenna under test.
• The highly directive nature of both the daytime antenna array ( six towers, with high efficiency ) and the nighttime antenna array ( nine towers, with standard efficiency ) means that the apparent power towards Houston is greatly in excess of the licensed power, about the equivalent of 857, 000 watts days and 197, 000 watts nights ( when compared to the 1, 000 watt non-directional reference antenna for this class of station, Class B ).