Extremely light HF antenna ----- HF Antenna

Eight wooden antenna distributor (dual-scheduled antenna), YAGI Antenna DIY Keywords: eight wood antenna production Many people have been in a successful production to the antenna, because since the orientation of an array is successful, why not do double row orientation antenna? Yes! We are going to be a huge The ambition, moving towards the goals that I want to achieve, so our technology will increase, which is also the spirit of amateur radio players. As long as you have completed the first unit's experiment 144MHz 983 wooden antenna, then you have to make a double-scheduled antenna, which is never a hard thing. As long as you have a dispenser, you want to do a few rows of orientation. As shown, the two rows are combined, and the middle must have a dispenser, and the distance between the two-arranged orientation antenna is about 80% to 90% long, and the dispenser is 75 ohms at both ends of the dispenser. The cable is equal to the cable. Precautions: The length of the two ends of the dispenser is preferably a quarter-wavelength of odd-numbered electronics. When you calculate the physical quarter wave length (the quarter-wavelength algorithm) of the first unit), Also use this length to calculate the length of the quarter wavelength on the electron, come to the length of the 5 ohm coaxial cable. For example: antenna frequency is 144MHz, its quarter wave length is 0.5 meters (physical), and the 75 ohm coaxial cable specification I use is RG-59, while RG-59 rate factors are 0.66 (75) The ohm coaxial cable specification has many species, and the rate factor is different. Please refer to the factory specifications), so I have to multiply the 0.5 meter just calculated again, so ask for a quarter of the electronic. The wavelength is 0.33 meters. Suppose I need the cable from the antenna's power supply point to the T-connector length of 1.98 meters, this length is just a quarter of the four-way wavelength, is an even number, and we Don't even even, we are odd, so we add the length to 2.3 meters (this length is a quarter wave length), which makes it an odd times, such efficiency is the best.

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