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 | |
| 59 later messages | ||
| Subject: | Re: GSM-noise "buzz" issue | |
|---|---|---|
| From: | Angus Ainslie (angu...@gmail.com) | |
| Date: | Sep 11, 2008 6:03:38 pm | |
| List: | org.openmoko.lists.hardware | |
On Tuesday 26 August 2008 14:22:54 Joerg Reisenweber wrote:
We found it's pin4 of JK4401 and only this pin that causes GSM-EMI-noise issue. We placed a ferrite bead to this pin, and it stops noise. Alas this isn't a viable rework, as it is extremely fragile and doesn't fit into case. See < http://people.openmoko.org/joerg/GSM_EMI_noise/noise_stopped_by_athena_rew ork/>
We tried to find another way to place a bead in this rail, first result (without bead yet), see < http://people.openmoko.org/joerg/GSM_EMI_noise/noise_stopped_by_cut_pin4/> This rework at least stops noise and should fit into case. It breaks function of headset mic and hold-button, but keeps function of headphones. We try to find a way to restore function of mic and button, based on this rework.
I will keep you updated. Please note all this IS NO RECOMMENDATION FOR A REWORK, and we can't answer any questions yet beyond what I've reported above.
cheers jOERG
Hi,
Even thought this is not not a recommended rework I started on it. I (wrongly) assumed by just removing the connector that it would fix the noise issue. It doesn't.
I'm assuming that is because pin 3 and 5 need to be shorted. I've been trying to find the pinout for JK4401 but no luck yet. Is it
1-3-5 5-3-1 plugin end -> or 2-4-6 6-4-2
Does anyone have a pin-out ?
Angus
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