Simple parabolic antenna production, satellite antenna production
Keywords: satellite antenna
As a satellite, it is not a problem with several parabolic antennas. However, there is not much that I don't do it. I used my leisure time last year (July, July), I did a 1.5M parabolic antenna, successfully received all the simulation programs of 134 ° E and 105.5 ° E, which is still working properly. Here, you will introduce this to the production of this low-cost parabolic antenna.
1. Application Principle: The parabola is the trajectory of the point from the focus and quasi-line, and the parabolic is rotated around its shaft. Parabolic equation: ρ = 2F / (1 + Cosψ) formula F is the focal length, ρ is a vector corresponding to different ψ angles, and ψ is the corresponding angle of the corresponding angle formed by the respective vectors ρ and F. Among them, the ψ ≤ 60 ° ψ intervals is 1 ° or 2 °, 3 ° is not too large, otherwise the necessary parabolic accuracy is low, the focal length F / D can take 0.65mF / d = 0.65 / 1.5 in 0.3-0.4 ≈0.433.
2, main materials: ф6mm steel, cement, sand, stone, cardboard (or other hard metal plate, three-fitted plate), easy pull can shell (or other metal foil), 300mm long steel tube different diameters.
3, make the mold: take a 0.5m × 1.6m hard flat cardboard, the list is taken from 0 °, 1 °, 2 ° ... 60 ° in accordance with F = 0.65m ψ ... 60 ° Substance ρ = 2f / (1 + COSψ) The ρ value is made of a parabolic on the cardboard. The higher the accuracy, the paperboard drawing the parabolic line is fixed on the tri-plate or other metal plate, and the shear is cut along the throwing and retain the convex portion. Looking for two metal tubes around 300mm, one of which can be set to another. The elongated intermediate is saw a 100 mm seam, sandwiched on the top of the top of the parabolate flange, and the top end leaves 200mm as the rotating shaft of the parabolic, the mold is completed.
4, make antenna: find a piece of soil of about 4 m2, excavation with shovel to dig a 0.28m diameter center of 0.28m, surrounded by a shallow parabolic pit, quantity, plus 300mm long steel pipe insert and try to fix tight. Insert the steel pipe on the mold into this tube and freely rotate. Sifting the fine soil with a sieve, the side of the rotation of the mandrel, until it makes a uniform surface. Take out the mold, put the inner steel pipe upwards up to 2.5mm, evenly pace 25mm thick cement concrete on the inner surface of the pit, the proportion is a cement: sand: stone = 1: 2: 3, mix well with water, in order to make the antenna more robust, can be in concrete Buried in the middle of the ф6mm steel bar. Insert the mold, roughly, then use the screened fine sand, cement to mix well with water, should be dilute, evenly spread in the inner surface of the pit, and rotate the mold while adding the mold, until the surface It is more smooth and even. The large pot is along a 30mm × 30 mm of concrete, and ф6mm steel bars can be added to increase rugity. The entire parabolic cover is covered with plastic cloth, pay attention to moisturizing. After 7-15 days, the antennas can be dig out from the pit, and the plastic cloth covered is removed. It is placed on the ventilation and dryness to dry the inner surface. The easy-pull can be cut with a flat large block, (take other metal foil: aluminum foil in the cigarette case, the aluminum foil in the tea box can be cut into small pieces), with 103 glue (other similar coluls ) Attached to the surface of the pot, and the conditional can also be surfacefully sprayed with a white paint. Take three ф6mm steel bars to do a triangular bracket, press F = 650mm to fix the feed on the focus, and the simple parabolic antenna is very successful.
5. Select different antennas diameter 1.2, 1.8, 2.0 Repeat the above 1-4 steps to make different sizes of antenna, pay attention to F / D = 0.3-0.4, and the maximum amount of ψ is mostly. In this less than two months, you will have a big pot of yourself, why not?
6. Receive: Put the high frequency header on the feed source, preset 105.5 ° e Asian 3S central 4 parameters, the connection is completed, and the antenna is standing in the center of the center of the hospital, two people carry the antenna On one side, adjust the elevation angle, then slightly rotate to adjust the azimuth, take the bricks. The image quality is above 4 or more, the sound is clear without any noise, and there are several other sets. Later received 134 ° E Asia Pacific 1A, the sound was very clear, but the individual table images were fly.
7, evaluation: Since the work can be more fine, the advantages: low cost, easy to make, strong resistance (about 180kg). Insufficient: large weight, not easy to move, put high places, changing the star. Hope that the enthusiasts can provide other easy-shaped materials to reduce the weight of the antenna, so that the antenna we do will be more perfect.
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