Keywords: portable 7MHz antenna production
Portable 7MHz antenna
Looking at the fossil antenna with the middle of the middle of the 10 watts, I am so envious, thereby also born to DIY's wishes for a portable antenna for the 7MHz band, especially because of the recent movement into the community I want to pull the antenna of one in one in the one-half of the wavelength. Diy a small portable antenna is getting more and more strong, and you will do it. It is preliminaryly, the antenna is divided into two three parts of the upper and lower part, and the above is vertical vibrator, and the following includes the sensitivity coil and the spiral coil. Do not shield the rejuvenation section, which considers the addition of the sensitivity coil to participate in the launch, improve the antenna efficiency, and the other is that it is easier to make. Next, a piece of bamboo pole is used in the lower part, and of course, it will be better to use by PVC management, but this diameter PVC tube. Its strength is not satisfactory, considering the often carrying flow, or the bamboo rod is relatively strong, but the bamboo festival raised on the bamboo pole is required to make a sleek sleek. Spiral coils and sensitivity coils are wound by a lacquered wire of 1.0 mm in diameter. The plumber is more thin in the bamboo rod. At 1 cm of the levip end, a pistol is drilled with a pistol by a pistol, and the enamel line is connected from the hole, the wire and the vertical vibrator are connected, followed by surrounding 70 on the bamboo rod, preferably every 10 One head is pumped, after 70, then take a pistol to drill a hole at the side of the line, pass the remaining enameled wire from the hole to fix the sensitivity coil portion. The rest of the lacquer line is rolled around 25 turns on the bamboo rod, then relax, re-count, see if it is 25, if not, make up the 25 包 线 线 线 1.25 meters, and make the enamel line line The bamboo rod is uniform, and the fixed line portion is fixed. Vertical vibrators use a 1.2-meter-long television trolley antenna, and the root is fixed to the bamboo rod of the sensitivity coil end, and is connected to the sensitivity coil, and the tie rod antenna is made into a detachable separation of the bamboo rod portion, mainly In order to facilitate carry. As for how to fix the tie rod antenna on the bamboo pole, each person is made according to their own situation, and I believe it is not difficult. However, pay attention to two points, first, the rod antenna and bamboo rod should be kept vertically, second, pay attention to the insulation of bamboo rods, otherwise, bamboo rods will affect the SWR of the antenna after the rain is wet. The specific production of the antenna is shown in the drawings. According to the antenna made according to the drawings data, its standing wave (SWR) is transferred to about 2.0, but if you want to adjust the SWR to 1.5 or less, then you need to constantly in the transmitter and antenna. Run back and forth, even the placement position (angle) of the antenna or the adjustment of the tie rod part is a mid-mime, and the unexpected effect is received. Finally, the adjusted antenna is cosmetic, and the long-projunction of 3 ~ 5mm wide, use a circle of pressing a circle to wrap the whole bamboo rod, which, can fix the sciral coil No move, two can make the antenna look more beautiful. Of course, due to the existence of the painting line on the bamboo pole, instant post may be not very compiled with the bamboo pole, but don't tighten, use the electric hair to heat the immediate post, instant post will "heat", tightly wrapped in bamboo pole As for what color is used, each person has a hobby of people, and there is no impact on the intrinsic quality of the antenna. I use this antenna, and the antenna is placed on the balcony outside the second floor, the vibrator is 104 cm, online test SWR = 1.5, using AW03H power only 5 watts of small machine, successfully and BG4UVH, BG6ABF, Ba6bi QSO, especially the QSO for BG4UVH, Zhejiang Haimen, at the time, the machine was 80C plus three-band poured V antenna, output power 30W, received his signal to 59+, and BG4UVH also gave me RS 55 ~ 57 Signal report. The actual effect is exciting. I also hope that everyone will participate in the test. Li Wei (BD6BM), Chaohu City Library, Anhui Province, 2005, March 28, 2005
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