Timeline for Why are there so many waveguide feeds (?) near the focus of Cassini's dish antenna?
Current License: CC BY-SA 3.0
8 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Oct 10, 2017 at 15:52 | comment | added | uhoh | I've accepted the answer and I'll go off and do some more reading. I'm still having trouble understanding why five feed horns are used for a given look angle. Usually when using multiple phased emitters to produce a beam, they are in free space and not at the focal point of an imaging system. | |
| Oct 10, 2017 at 14:48 | vote | accept | uhoh | ||
| Sep 15, 2017 at 3:20 | comment | added | Mark Adler | There are four look angles to the side and one on center for the radar. There are five horns for each of the four side look angles. | |
| Sep 15, 2017 at 2:03 | comment | added | uhoh | The real photo is much appreciated, thanks. I'm still scratching my head on the "Why are there so many..." part. Are these 20 or so rectangular windows mostly emitters, or receivers, or a mix of both? Are there so many in order to get some angular segmentation, as in a focal plane array? You may want to take a few days and reply later, the timing is awkward I know. | |
| Sep 14, 2017 at 20:49 | comment | added | Mark Adler | Buh bye Cassini, my first spacecraft. Sniff. | |
| Sep 14, 2017 at 20:45 | history | edited | Mark Adler | CC BY-SA 3.0 |
add images
|
| Sep 14, 2017 at 20:36 | history | edited | Mark Adler | CC BY-SA 3.0 |
clarify
|
| Sep 14, 2017 at 20:28 | history | answered | Mark Adler | CC BY-SA 3.0 |