Timeline for Satelite dish modified for Wi-Fi (Signal Elevation Question)
Current License: CC BY-SA 3.0
6 events
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| Feb 23, 2020 at 20:12 | comment | added | always_learning | @tomnexus - thank you for pointing that out. I deleted that comment and re-posted a corrected version. And... I had never considered that an offset dish had a secondary purpose of using the least metal for a given reflective area. I thought it was only to get the arm and LNB shadow out of the reflective area. ty | |
| Feb 23, 2020 at 20:08 | comment | added | always_learning | @Radovan Garabík - have you got a reference for the 100 cm and upwards, and for the f/D rule of thumb? ty | |
| Feb 23, 2020 at 20:01 | comment | added | tomnexus | @always_learning You have a space so he might not see your @. In my experience Ku band receiving dishes are always offset, and under 1.2 metres. Some are elliptical and project to a circle when viewed down the beam, this uses the least metal for area. Some are much narrower, say 80 cm wide and 40 cm high, this is just enough to select between satellites, while not trying to have as much gain. Earth station antennas will probably be centre fed, cassegrain with a subreflector, and probably 5-10 metres diameter. I've never seen a single side arm, centre fed TVRO dish. | |
| Jun 27, 2017 at 6:49 | comment | added | Radovan Garabík | "Ku band satellite TV dishes are always offset feed, whatever their shape." - not quite true, dishes from 100cm upwards are increasingly more often prime focus, especially old ones. As a rule of thumb, f/D for offset dishes tends to be 0.6 or 0.7, for prime focus ones about 0.35. | |
| Jun 24, 2017 at 7:55 | history | edited | tomnexus | CC BY-SA 3.0 |
added 305 characters in body
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| Jun 24, 2017 at 7:50 | history | answered | tomnexus | CC BY-SA 3.0 |