Jim Morris wrote: > Dave Clark wrote: > > >> Can you correlate the buzzing to your signal level? IIRC, most phones >> will increase transmit power as needed to overcome noise. If the noise >> is caused by RFI from the GSM radio, increased power would tend to >> increase the interference. >> > > I have a very low signal here one bar at most, I haven't tried it where there > is good reception, as > I can't really use it as a phone yet. However with that clue I'll try it ASAP > in an area where I get > better reception. > > FWIW my other Cell phones also get very low reception here, but don't have > any noise. > > I hope if this is a H/W problem we can get it fixed even after the warranty > expires as it definitely > makes the phone a brick otherwise. > I know GSM transmissions can present significant interference on audio equipment - if my phone (any GSM phone) is on my desk, I can hear periodic static in my computer speakers as the phone "checks in" with the cell tower - it sounds like three quick, buzzes in about 1 second. This happens a couple times an hour.
When it receives a call, I get a steady buzz starting 1 to 3 seconds before the phone rings, and continuing until I hang up. I would imagine that ALL cell phone hardware would have to deal with this audio interference, and since I don't hear it in many other phones, I'm pretty sure it can be filtered out with some sort of audio processing. Incidentally, the speaker-phone feed back could probably be resolved with the same filter. _______________________________________________ support mailing list support@lists.openmoko.org https://lists.openmoko.org/mailman/listinfo/support