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.).
Next: Yagi Antennas Design Parameters. The Yagi-Uda antenna or Yagi Antenna is one of the most brilliant antenna designs. It is simple to construct and has a high gain, typically greater than 10 dB. The Yagi-Uda antennas typically operate in the HF to UHF bands (about 3 MHz to 3 GHz), although their bandwidth is typically small, on the order of a few percent of the center frequency.