Satellite antenna feedforward, feedback correcting feedback inverting and amateur production, The use of satellite antennas
Keywords: Satellite antenna feedforward correction, feedback correct supply feeder inversion and amateur production
Satellite antenna feedforward correction, feedback correcting feedback inverting and amateur production
I. Brief introduction of satellite antenna characteristics (see Figure 1)
1. The AGB axis of the feedback antenna is OG, the focus is f, the satellite wave is focused to the F point through the AGB reflection, and the elevation angle of the measurement is 90 ° minus AB and the plane angle.
2. The axis of the AEG and GHB of the feedward antenna is also OG. However, AEG is a fed forward and GHB is a feedback transcend, so the feedward correction ratio is small, and the feedback transition is mainfast correction. That is, you often say that the vocal angle is generally 22 °.
3. When the AEG of the feedward antenna is received, its elevation angle is 22 ° lower than the AGB of the feedforward antenna, and the GHB of the feedward antenna is 22 ° compared to the AGB of the feedforward antenna.
Second, the antenna amateur production (see Figure 2)
The author's antenna is made of aluminum pot cover (some people make it a few layers of patches into natural arcs, and some people use them directly, as long as the signal is good). When the lid is installed on the L-shaped bracket, the pot surface AB is parallel to it, so that the angular is more accurate. F is its focus, BF is parallel to CG, and the spacing of BC and FG when installing high frequency heads. The angle of the bracket L is generally 65 ° -75 °. When the high frequency head mounting line is positive to the pot, and the high-frequency head center line is partially opposed to the pot heart (O ').
The focus of the homemade antenna is the most difficult, some people are focusing on the sun, that is, let the pots facing the sun. The hand is light in front of the pot, and the light spot is the focus. But pay attention to this will have two focus, one of which is positive focus. The adjustment method is to positively press the pot, and then press the pot, let the light spots and L shaped, so that the spot satisfies the distance between the FG equal to the BC, and makes BF parallel to CG, you can install high frequency heads. NS.
Another method is to know the satellite or elevation angle, align the pot to the satellite, pick up the receiver, and hold the high frequency head when the stars move, move in the direction (pay attention to it, do not have too much shaking) .
The above two methods can basically determine the high frequency head position. The strongest set of signals on the satellite when the star is received (pay attention to whether the size of the pot you do is in line with the strong small requirements of the satellite wave paravertion), the polarization angle, the elevation and the azimuth should be pre-adjusted, then Enter the received data, turn left and right, and then adjust the angle, and will generally receive the signal. If there is no, it will take the high frequency head to move before the pot, combine the azimuth, and adjust it slowly.
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