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Admin
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Everything posted by Admin
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,,, the simplest UWB antenna, Sputnik antenna...
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,,,for offset antenna...
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,,,you have two options...with the center phase where the focus of the offset parabola is placed..!!!
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For now, I think it will stay the way it is...!!!
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Marcello, it doesn't make sense to work in two positions..."Wifi extender antenna for long distance (10 km)"+"4G Repetear/Amplifier"...!!! I'm going to delete one of them, so decide which one to stick with...!!!
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,,, could be a solution but better wait until I do the simulation for the desired frequency...!!!
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,,, but what frequency do you want to work on ...?
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I think this solution would be good...https://yandex.ru/video/preview/?text=Wifi extender antenna for long distance (10 km)&path=wizard&parent-reqid=1640579748980487-3609367412323145088-man1-6175-man-l7-balancer-8080-BAL-633&wiz_type=vital&filmId=9712634466127784192 ,,,or something like this...
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,,, to put in the focus of a parabolic offset...Pacman Epicyclod
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It looks like this antenna is pretty good...
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Vova, do you have any dimensions to this ... ???
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I think that's the best... ,,,and here is the file.cst
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,,,the distance between the vibrator and the reflector as well as the other dimensions must be reviewed...!!!
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,,, a simulation with the above dimensions (given by me)...
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,,,if Guanella adaptation is correct, it can be even better... ,,,framed in red are dimensions in medium wavelengths...
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Gregorian Antenna – symmetrical reflector...
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Coaxial cables with an impedance of 50 ohms (Ω) are used to connect the transceiver to the antenna. The most common cables are RG 58 and RG 213:The RG 58 cable is used for use, which has a diameter of 5 mm and the losses it introduces are insignificant, due to the small length of the cable. One detail that you MUST keep in mind is that a cable must be equal in length to multiples of ½λ to properly transfer the impedance of the antenna. If the length is different then the cable will work as an impedance transformer. In this case, a properly tuned antenna will have a high SWR at the transceiver output. The shortening factor (k) has a special importance in the calculation of the cable length. It differs depending on the dielectric of the cable. -shortening factor(k) -Solid Polyethylene (PE): 66 %
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,,, it depends on what kind (type) of cable it is ... in any case it is not a 75 ohm impedance cable ... !!!
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,,, Shabra,how to get a commercial Kathrein vibrator...???
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Do you understand what I mean?
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,,,Shabra,try to put the plate in the focus of the parabole grid...!!!
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,, the secondary reflector from the grid antenna is for either vertical or horizontally polarization ... you need a secondary reflector with circular polarization...!!!
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,,, another configuration ...
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Or the same ATVKD-15/21-39 (TV antenna “wave channel”, decimeter range, 15-element, channels 21-39):
