Amaters 2M wave 4 unit box wireless production ----- fm antenna

Keywords: FM antenna, 2 meter wave antenna Be Amaters are amateur radio enthusiasts to study radio communication technology, and conduct technical exchanges, training and race tools. This article describes the box wireless wireless wireless communication for 2M wave communications (CUBICAL quad antenna). With an antenna rotator and azimuth controller effectively contact the amateur radio enthusiast. The box antenna has the advantages of strong direction, high gain, easy matching, and easy-to-produce, and now introduces the production of 4 unit box antennas at 145MHz. As shown in FIG. 1, the block antenna is composed of an leading vibrator, active vibrator, and reflective vibrators. The size of the vibrator and the spacing size are marked on the graph, and the unit is mm, considering the wind resistance and making it easy, the author uses a commercially available aluminum alloy strip to make a vibrator. The oscillator is equivalent to Figure 2, opening one end of the box and drills a few small holes to adjust the circumference of the entire frame. The intermediate is supported by epoxy strips, so a leading to the vibrator is done. Similarly, another direct residue and reflection vibrator can be produced. As shown in Figure 3, the active vibrator is fixed to the epoxy strip on the intermediate opening, and the feeder is connected as a feed point. Be Be The antenna crossbar employs a commercially available aluminum alloy square tube of 25mmm25mm, and the crossbar is about 1.2m. The connection of each vibrator and the crossbar can first secure the epoxide strip on a small square, and then secure the square tube on the crossbar. The feedstock of the active vibrator of the antenna can be connected directly to 50 ohm runners without any matching. Attention must be paid to the placement of the source vibrator feedback (Figure 4). Radio enthusiasts are placed in the direction shown in Fig. 4 (b) for 2M band. After the wireless installation is completed, it can be adjusted, only need to increase or decrease the length of the active vibration and the length of the vibrator to make SWR = 1 in the upper transmitter and the standing wave ratio.

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