The 50-50 grind is the first grind trick that most skaters learn, and is a great basic skateboard trick to learn. The 50-50 grind is where the skater grinds the ledge or rail with both trucks. The nice thing about the 50-50 is that you can learn to do it on a curb, which is a pretty safe and easy place to practice.
dBi is decibels relative to isotropic radiator which means that the radiator (an antenna, usually) sends the signal equally strong in all directions, including above and below. Such a radiator would have 0 dBi.(I have yet to see an antenna like that -- it may exist only in math theory.).Bi is decibels relative to isotropic radiator which means that the radiator (an antenna, usually) sends the signal equally strong in all directions, including above and below. Such a radiator would have 0 dBi. (I have yet to see an antenna like that -- it may exist only in math theory.).
A letter following the dB indicates the reference antenna: * Gain specified in decibels-isotropic (dBi) indicates how the antenna performs as compared to an isotropic radiator. An isotropic radiator is a theoretical antenna that radiates equally in all directions (including up and down).* Gain specified in decibels-dipole (dBd) indicates how the antenna performs as compared to a dipole antenna. A dipole antenna has a 2.14 dBi gain over an isotropic radiator.Any dBi figure may be converted to dBd by subtracting 2.14. Be careful when comparing antenna gains that both values are in the same unit. Whip antenna gains are often specified in dBi, while other antennas are often specified in dBd. dipole antenna has a 2.14 dBi gain over an isotropic radiator. Any dBi figure may be converted to dBd by subtracting 2.14. Be careful when comparing antenna gains that both values are in the same unit. Whip antenna gains are often specified in dBi, while other antennas are often specified in dBd.