Cave satellite receiving antenna production, Satellite Antenna
Keywords: pot cover satellite receiving antenna production
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Pot cover satellite receiving antenna production
Many friends want to receive high-power live satellite TV with as little antennas, plus some users who are subject to small antennas to watch due to restrictions on installation space. How many places can buy the minimum ku antenna also has 0.45m, so he started to make a small antenna, starting to pick up in the enthusiast. This small antenna often makes it with a cooking pot, or with a steel plate, aluminum plate to patterize the shape of the small antenna. It is true that the burning friends who have made the antennas with a pot are really popular, and this approach is also popular among the Internet. Homemade antenna soil, each has a thousand autumn, but it is uncomfortable with excellent production and practical. The main purpose of knocking antennas with a pot or metal sheet is not in order to save money, but to see if the antenna minimize the caliber, challenge the limit, from the production of antenna surface, antenna size, focal length, antenna efficiency The understanding of knowledge, and it is also a pleasure. Be
The author collected nearly 20 different pots, and also made a few small antennas with aluminum plates. The maximum diameter is 60 cm, the smallest is 29cm, mostly the enamel cooking pot, others are aluminum pot. In the experiment of many pot covers, we have drawn a few experience and select several practical antennas and everyone to communicate, or you can use it as a reference. Several pot covers with homemade antennas are shown in Figure 1 - Figure 8. Figure 1 The enamel pot diameter is 296 mm, only one strengthening ring on the lid, the surface is very smooth, the depth of the pot is 26mm, more flat, use this pot to receive a pot of 138 and 146, a pot of two stars, efficiency Very high, unfortunately, the market is not easy to buy; the antenna of Figure 2 is homemade, a diameter of 300mm, an antenna surface refers to the 350mm feedback antenna of Taiwan, takes a horizontal surface, select 1 - 2mm aluminum plate The homemade mold is made, and its receiving efficiency is better than the pot cover of Figure 1. Its disadvantages are to make molds, manual knocking, time-consuming effort; Figure 3 is 320mm in the aluminum link of Figure 3; Figure 4 is 1 - 2 mm The aluminum plate is made in the homemade mold, which is 320 mm, which is of course more efficient than Figure 2, which is related to the effective reception area of the antenna, which is the same as shown in Fig. 2; FIG. 5 is aluminum having a diameter of 320 mm Cover or enamel pancreen is a mini pot cover of 230mm in diameter, intended to challenge the limit of the minimum diameter of the antenna; Figure 6 is an enamel pot cover with a diameter of 380 mm; Figure 7 is an enamel pot cover having a diameter of 324 mm, which is easy Buy, and efficiency is second only to the pot cover of Figure 1, the efficiency is also good; Figure 8 is an aluminum pot cover of 600 mm in diameter, the diameter is large, but the efficiency can only reach the level of the Zhongwei 0.45m antenna, and the material is thin, easy to deform It is not advisable. The choice of the pot cover is mainly used to receive the programs of the high-power Ku band. Since it is used when the fed antenna is used, its focus is not in the center of the pot, so the surface of the pot is required to be flat, such as the surface of the surface, its efficiency It must be very low, such as a 0.6m feedward antenna, which is only about 6.5cm in the depth of the pot. The surface of the 0.6M antenna of the imported surface is more flat, and the depth of the pot is about 5.5 - 6cm. The usual pot cover has 3 - 6 circles, used to enhance the strength of the lid, the better the over-surface of the circle, the better, if there is a clear level, it is not appropriate, because this will make the signal unable to reflect to high frequency Head feed on the source disk. It is also important to note that the pot surface should be smooth and smooth, and the material is thick. As for the size of the pot, it is recommended to be better between 28-35cm, and the pot is greatly efficient, but it will lose its own meaning, and if the surface is wrong, its efficiency will be counterproductive. In the experiment, one diameter of 45 cm has a pot that is less efficient than the 35cm enamel pot, which is the reason why the surface is very similar. This paper recommends the three pot cover and Figure 2 Homemade antenna, formerly troubles, buy it, the latter fee, but the antenna is good. Regarding the focal length of the LNB and antenna, the calculation formula employed by the feedback antenna is the depth of the antenna radius to the center point of the 4-fold anti-central point to the pot, such as an example of a commonly used 1.5M antenna, its radius is 75cm The depth of the pot is 25cm, the focal length A, the radius y = 75, the antenna depth H is 25, and the formula A = 752 ÷ (4 × 25) = 56.25 (cm), due to the design of each manufacturer's antenna Similarly, the production process is not exactly exactly, so the focal length is only an approximation. The author did not find the focal length calculation formula when using the "pot cover antenna" to receive the KU program, so it can only be patiently looking for the best focal length of the antenna, which is time consuming. And during this time, we have also found that after the focal length of different pots is adjusted, "elegance" when receiving the same satellite is different. Looking for a shortcut to the focus, on the predecessored feedback antenna, remove the pot surface, hold the pot, place the position of the original audio, move forward, find the best focal length and elevation, measurement record Down. According to these data, the bracket can be fixed on the bracket, and this method will be used to avoid the blind look, saving a lot of time. The installation method uses a pot cover as antenna, which is suitable for flying, because its elevation is high, borrowing the sky, the occupied space is small, easy to fix, thereby improving the stability of the antenna. When the material selection and production of the bracket can be considered according to different placement positions and the selection of materials, several production methods and related size data are described below: 1. The bracket of the use of the shelf angle steel to make an antenna is characterized by the selection. Easy to purchase, this angle steel is all strip holes, just use screws to make debugging is very convenient, and easy processing. After the size is set, the store can be cut, and Fig. 9 provides the focal length and position of the LNB and the pot cover, where the size shown in Figure 9 is only for reference, because the focal length is different when using different pot cover. The installation size and elevation angle are also different. Figure 10 The pot surface is 35 cm, selects 30 × 30 mm angle steel, and each angle steel is connected with a 6mm screw, the chassis is made into a T-shaped, and do three three-point feet under the angle steel. The height of the feet is 10-15mm, which is very smooth on the ground or on the table cabinet. It is used to secure the pot and adjust the front end of a corner steel with the elevation angle and the front end angle steel. use. The hinge is fixed, and the rear end is fixed to a rear angle steel, so the upper and lower moving changes are very light and flexible, and the entire base bracket makes it very simple. After the size is cut, it can be combined. The intensity of this triangular base structure Sufficient, easy to move, can be placed inside and outside the balcony, and this antenna in use will be used. 2, choose the bracket made by PVC, see Figure 12
This material is used to make a bracket, which is characterized by convenient access, and is simple to process. It is very convenient to make mobility and commissioning, suitable for placing in the balcony, all PVC tubes are connected to PVC three-way or elbow, PVC dedicated adhesive, and can be loaded at three o'clock in T-shaped The upper three 10 - 15mm foot feet, making it more stable when placed on the ground, in the joints that need to be adjusted, such as elevation angle and focal length, etc., the expansion screws of M6 can be cleaved in the elbow of the joint, and the specific method is: Remove the expansion tube on the expansive screw, a 3.2 mm through hole on the tail of the screw, open a 3.2 mm pair of perforations on the PVC elbow, fixed with M3, see Figure 13, this antenna The lack of beauty is a large room or the balcony space. Be
3, the shape of the table lamp holder reference lamp and microscope, select the stent of the indoor antenna of the open circuit, and remove the original tie rod antenna, with its base and elevation adjustment. There are several options for this bracket finished product, just consider whether its elevation adjustment is light and flexible, beautiful appearance. This type of bracket has a plastic housing, which is very light, and it is easy to turn over, it is easy to turn it back, unstable, and must add a piece of iron to increase its own weight. Most of this screw that adjusts the elevation angle is mostly plastic, it is easy to slip teeth, and must be replaced with a metal screw. For the convenience of debugging elevation angle, it can increase the rubber skin on both sides of the screw, such as a car tire, etc., to increase its friction, so that the elevation screw receives 80%, and does not decline when it is changed by hand, this style The bracket is very small and flexible. It is well done like a craft, suitable for placing on the table cabinet or the window sill of the indoor roof window, which is shown in Figure 14. This bracket is particularly simple, with very few self-cultivation, decomposition map, see Figure 15. (1) The antenna fixed bracket uses a steel strip of 20mm wide, 500mm, thickness of 1-2 mm, bends at 180 mm, and there are some radians on both sides, which are used to fix antenna and high frequency head, and the bracket in the figure Adopt two steel strips. (2) Strengthen the strip, when the antenna is debugged, measure the distance from the high frequency head clamp, with a 10mm metal strip, the thickness is at 0.8-1mm, one end is fixed on the high frequency head clamp, and the other end is fixed On the pot, mainly in order to prevent the rocking of the high frequency head, the reinforcing strip in the figure is made of organic glass, and the bending iron is warmed by the soldering iron. Be
Figure 16 is a self-strait lamp antenna bracket with rubber wood. Be
4, using steel plate making brackets to use this method, the characterization of making the debugging distance, the elevation angle is particularly convenient, because the method of opening the strip hole and multi-point circular hole in each adjustment site is simple and strong, convenient, but The structural parts need to be self-made, time-consuming, and outside the balcony can be used, and the shape is shown in Fig. 17, and the exploded view refers to Fig. 18. See next page Next
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