121 messages in org.openmoko.lists.hardwareRe: GSM-noise "buzz" issue| From | Sent On | Attachments |
|---|---|---|
| Joerg Reisenweber | Aug 5, 2008 8:23 pm | |
| Joerg Reisenweber | Aug 5, 2008 8:26 pm | |
| Joerg Reisenweber | Aug 11, 2008 5:06 am | |
| Ole Kliemann | Aug 11, 2008 9:39 am | |
| Joerg Reisenweber | Aug 12, 2008 3:54 am | |
| Candy Chou | Aug 12, 2008 4:06 am | |
| Andy Green | Aug 12, 2008 4:35 am | |
| Candy Chou | Aug 12, 2008 4:55 am | |
| steve | Aug 12, 2008 9:27 am | |
| Joerg Reisenweber | Aug 26, 2008 5:22 am | |
| Torsten Sievers | Sep 11, 2008 4:35 am | |
| Angus Ainslie | Sep 11, 2008 6:03 pm | |
| Angus Ainslie | Sep 11, 2008 6:12 pm | |
| Andy Green | Sep 12, 2008 12:27 am | |
| Joerg Reisenweber | Sep 12, 2008 6:19 pm | |
| Joerg Reisenweber | Sep 12, 2008 7:32 pm | |
| Angus Ainslie | Sep 15, 2008 8:15 pm | |
| Andy Green | Sep 16, 2008 6:23 am | |
| Angus Ainslie | Sep 16, 2008 7:24 am | |
| Joerg Reisenweber | Sep 16, 2008 2:28 pm | |
| Andy Green | Sep 17, 2008 1:41 am | |
| Joerg Reisenweber | Sep 17, 2008 8:27 am | |
| Andy Green | Sep 17, 2008 8:55 am | |
| Joerg Reisenweber | Sep 17, 2008 10:11 am | |
| Angus Ainslie | Sep 17, 2008 12:00 pm | |
| Andrew Bruno | Sep 17, 2008 1:04 pm | |
| Werner Almesberger | Sep 17, 2008 3:04 pm | |
| Joerg Reisenweber | Sep 17, 2008 5:39 pm | |
| Werner Almesberger | Sep 17, 2008 9:27 pm | |
| Torsten Sievers | Sep 17, 2008 11:00 pm | |
| Uwe Klein | Sep 18, 2008 12:54 am | |
| Andy Green | Sep 18, 2008 1:51 am | |
| Joerg Reisenweber | Sep 19, 2008 10:14 am | |
| Werner Almesberger | Sep 19, 2008 10:58 am | |
| Joerg Reisenweber | Sep 19, 2008 11:17 am | |
| Joerg Reisenweber | Sep 19, 2008 11:35 am | |
| Werner Almesberger | Sep 19, 2008 12:41 pm | |
| Florian Zeitz | Sep 19, 2008 1:23 pm | |
| Werner Almesberger | Sep 19, 2008 1:56 pm | |
| Esben Stien | Sep 19, 2008 2:22 pm | |
| Joerg Reisenweber | Sep 20, 2008 8:33 am | |
| Andy Green | Sep 20, 2008 8:35 am | |
| Joerg Reisenweber | Sep 20, 2008 9:00 am | |
| Andy Green | Sep 20, 2008 9:07 am | |
| Werner Almesberger | Sep 20, 2008 1:13 pm | |
| Werner Almesberger | Sep 20, 2008 1:19 pm | |
| Werner Almesberger | Sep 20, 2008 1:31 pm | |
| Joerg Reisenweber | Sep 20, 2008 2:15 pm | |
| Werner Almesberger | Sep 20, 2008 2:45 pm | |
| Joerg Reisenweber | Sep 20, 2008 3:10 pm | |
| Werner Almesberger | Sep 20, 2008 5:54 pm | |
| Andy Green | Sep 21, 2008 1:13 am | |
| Uwe Klein | Sep 21, 2008 1:47 am | |
| Andy Green | Sep 21, 2008 2:10 am | |
| Uwe Klein | Sep 21, 2008 2:27 am | |
| Andy Green | Sep 21, 2008 2:41 am | |
| Werner Almesberger | Sep 21, 2008 6:29 am | |
| Uwe Klein | Sep 21, 2008 6:36 am | |
| Werner Almesberger | Sep 21, 2008 7:18 am | |
| Werner Almesberger | Sep 21, 2008 7:22 am | |
| Joerg Reisenweber | Sep 21, 2008 3:18 pm | |
| Joerg Reisenweber | Sep 21, 2008 3:55 pm | |
| Joerg Reisenweber | Sep 21, 2008 4:33 pm | |
| Joerg Reisenweber | Sep 21, 2008 4:42 pm | |
| Werner Almesberger | Sep 21, 2008 4:51 pm | |
| Joerg Reisenweber | Sep 21, 2008 6:08 pm | |
| Torsten Sievers | Sep 21, 2008 11:32 pm | |
| Andy Green | Sep 22, 2008 2:34 am | |
| Andy Green | Sep 22, 2008 2:46 am | |
| Uwe Klein | Sep 22, 2008 5:37 am | |
| Werner Almesberger | Sep 22, 2008 5:41 am | |
| Andy Green | Sep 22, 2008 5:47 am | |
| Uwe Klein | Sep 22, 2008 5:52 am | |
| Joerg Reisenweber | Sep 22, 2008 6:34 am | |
| Uwe Klein | Sep 22, 2008 6:54 am | |
| Andy Green | Sep 22, 2008 7:03 am | |
| Andy Green | Sep 22, 2008 7:10 am | |
| Andy Green | Sep 22, 2008 7:21 am | |
| Uwe Klein | Sep 22, 2008 8:12 am | |
| Joerg Reisenweber | Sep 22, 2008 9:04 am | |
| Joerg Reisenweber | Sep 22, 2008 9:14 am | |
| Uwe Klein | Sep 22, 2008 9:18 am | |
| Joerg Reisenweber | Sep 22, 2008 9:48 am | |
| Andy Green | Sep 22, 2008 9:49 am | |
| Joerg Reisenweber | Sep 22, 2008 11:09 am | |
| Werner Almesberger | Sep 22, 2008 3:41 pm | |
| Andy Green | Sep 22, 2008 4:02 pm | |
| Werner Almesberger | Sep 22, 2008 4:11 pm | |
| Andy Green | Sep 23, 2008 2:29 am | |
| Werner Almesberger | Sep 28, 2008 7:38 pm | |
| Andy Green | Sep 29, 2008 12:53 am | |
| Florian Zeitz | Sep 29, 2008 9:20 am | |
| Andy Green | Sep 29, 2008 9:51 am | |
| Florian Zeitz | Sep 29, 2008 10:08 am | |
| Joerg Reisenweber | Sep 29, 2008 11:34 am | |
| Werner Almesberger | Sep 30, 2008 5:48 pm | |
| Joerg Reisenweber | Sep 30, 2008 8:34 pm | |
| Torsten Sievers | Oct 9, 2008 12:25 am | |
| shaw...@gmail.com | Oct 12, 2008 5:03 pm | |
| Joerg Reisenweber | Oct 12, 2008 5:18 pm | |
| 21 later messages | ||
| Subject: | Re: GSM-noise "buzz" issue | |
|---|---|---|
| From: | Joerg Reisenweber (joe...@openmoko.org) | |
| Date: | Sep 20, 2008 3:10:42 pm | |
| List: | org.openmoko.lists.hardware | |
Am Sa 20. September 2008 schrieb Werner Almesberger:
But that's something you'll have to solve anyway. Otherwise, even the nicest CMU200 will be of little use.
Well it's a little different to run a certified GSM-phone on a CMU200 which itself is at -80dBm, or to run a selfmade 2W-oscillator ;-) Though the result is the same from a technical point of view.
Basic guidelines:
Good principles for sure.
All connectors to outside of housing SHOULD have EMI-filters [[edit: as close as possible to component]] on all lines
Shouldn't the EMI filters rather be where the signals enters the cage ?
Actually these "quick-and-dirty" specs require both. It's arguable whether we can save one of them. The spec was done to *guarantee* a clean buzz-free design, rather than with BOM in mind ;-)
*) that's one of the points why it's more reasonable to have a separate cage.
Hmm, makes the mechanical setup more complex, though.
Marginally. We could have another tin-wall inside the current can, forming two separate compartments.
We don't want the need for EMI-block on lines that aren't related to audio, but run to same cage.
Shouldn't they be filtered anyway, lest we contaminate other signal paths, e.g., hyper-sensitive GPS ?
Hm, guess I don't get it. Idea is to block all RF from entering can. Clock-harmonics and the like are a completely different story, and also the clock frequency itself could create noise if a clocked component is placed inside audio can, not only it's harmonics.
/j
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