BI1VNV A finished 70cm band Yagi antenna with approximately 10-15 elements typically has a gain of around 14 dB, while a parabolic reflector needs to be designed for at least 18 dB… I'll search online for some formulas and calculate the gain using the formula: G (dBi) = 10 * log{4.5 * (D/λ0)}2} However, when calculated in reverse, the diameter would need to be 2.6 meters. If it's a 2-meter band antenna, a finished 5- or 10-element Yagi antenna would have a gain of approximately 9 dB. A parabolic reflector would also need to be designed for at least 15 dB. This calculation results in a diameter of 5.3 meters. This doesn't take into account the antenna efficiency, which is not 100%. Therefore, the size needs to be larger. I feel that two or four-element arrays are more resistant to wind and damage.🤣(By the way, this formula was found online; I'm not sure if it's correct. If anyone who understands this can check and explain it, I would be very grateful.)
闽ICP备2021006864号-7
闽公网安备35020602002794号
互联网举报中心