GSM buzz

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GSM buzz which only the person you are talking to can hear has been an issue with the GTA02.  It has been discussed in several posts on the community mailing list. One early one is here [http://lists.openmoko.org/nabble.html#nabble-td1509627|a1509627]. There is a fix for it, but it requires highly technical hardware skills.  The big-C_rework_SOP_rc2.pdf, which describes the soldering required to fix the buzz, can be found here [http://people.openmoko.org/joerg/GSM_EMI_noise/] as can a user's post of their result, from here [http://anyotherkey.googlepages.com/c]. 
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{{Languages|GSM buzz}}
  
OpenMoko has a program offering the big-C rework for owners of the model A5 and A6 FreeRunners in [http://sdgsystems.com/estore/cart.php?target=product&product_id=269&category_id=17 the United States] and [http://www.handheld-linux.com/wiki.php?page=Buzz-Rework the EU]. Please see [http://lists.openmoko.org/pipermail/community/2009-June/049106.html the mailing list announcement] for more details.
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An annoying buzz which only the person you are talking to can hear has been an issue with the [[Neo FreeRunner]]. This defect is found in the versions A5 and A6 of the FreeRunner. The buzz will occur if these models are used with some radio cells which operate at a certain frequency. According to a German distributor it occurs for about 2% of all users.[http://pulster.de/d__om__OpenMoko_Freerunner991.htm] It has been discussed in several posts on the community mailing list. An early one is here: [http://lists.openmoko.org/nabble.html#nabble-td1509627|a1509627]. There is a fix for it, but it requires highly technical hardware skills. The file [http://people.openmoko.org/joerg/GSM_EMI_noise/big-C_rework_SOP_rc2.pdf big-C_rework_SOP_rc2.pdf], which describes the soldering required to fix the buzz, can be found here [http://people.openmoko.org/joerg/GSM_EMI_noise/] as can a user's post of their result, here [http://anyotherkey.googlepages.com/c]. 
  
Additionally Openmoko has support those offering a diy and encourage hardware volunteers. Fix it / buzz fix parties have been taking place.
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Previously Openmoko had a program offering the big-C rework for owners of the FreeRunner in the United States and the EU. The Distributor '''Golden Delicious''' (see [[Distributors]]) will continue providing this service privately inside the EU. Furthermore some users are organizing [[BuzzFixParty|Buzz Fix Parties]] where you can get your device fixed. The A7 model includes the Big-C rework by default.
  
There is still a problem though, as the wired mic causes buzz [http://lists.openmoko.org/nabble.html#nabble-td2509041]
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Note that the "Big C" buzz fix only fixes the internal microphone; a wired headset mic will still cause buzz [http://lists.openmoko.org/nabble.html#nabble-td2509041].  A bluetooth headset may be one solution.
  
A bluetooth headset may be one solution.
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[[Category:Neo FreeRunner solved GSM buzz problems| ]]
 
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[[Category:GTA02| ]]
== See also ==
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* [[Neo_FreeRunner_Hardware_Issues#Poor_Audio_Quality_.28FIXED.29|Hardware Issues]] - detailed discussion of problem and solutions.
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* [http://www.handheld-linux.com/wiki.php?page=Buzz-Rework handheld-linux.com] - Providers of the GSM buzz fix in the EU.
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*[[http://sdgsystems.com/ sdgsystems.com] - Providers of the GSM buzz fix in the United States.
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{{Languages|GSM}}
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[[category:GSM]]
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Latest revision as of 13:51, 20 December 2011


An annoying buzz which only the person you are talking to can hear has been an issue with the Neo FreeRunner. This defect is found in the versions A5 and A6 of the FreeRunner. The buzz will occur if these models are used with some radio cells which operate at a certain frequency. According to a German distributor it occurs for about 2% of all users.[1] It has been discussed in several posts on the community mailing list. An early one is here: [2]. There is a fix for it, but it requires highly technical hardware skills. The file big-C_rework_SOP_rc2.pdf, which describes the soldering required to fix the buzz, can be found here [3] as can a user's post of their result, here [4].

Previously Openmoko had a program offering the big-C rework for owners of the FreeRunner in the United States and the EU. The Distributor Golden Delicious (see Distributors) will continue providing this service privately inside the EU. Furthermore some users are organizing Buzz Fix Parties where you can get your device fixed. The A7 model includes the Big-C rework by default.

Note that the "Big C" buzz fix only fixes the internal microphone; a wired headset mic will still cause buzz [5]. A bluetooth headset may be one solution.

Personal tools

GSM buzz which only the person you are talking to can hear has been an issue with the GTA02. It has been discussed in several posts on the community mailing list. One early one is here [1]. There is a fix for it, but it requires highly technical hardware skills. The big-C_rework_SOP_rc2.pdf, which describes the soldering required to fix the buzz, can be found here [2] as can a user's post of their result, from here [3].

OpenMoko has a program offering the big-C rework for owners of the model A5 and A6 FreeRunners in the United States and the EU. Please see the mailing list announcement for more details.

Additionally Openmoko has support those offering a diy and encourage hardware volunteers. Fix it / buzz fix parties have been taking place.

There is still a problem though, as the wired mic causes buzz [4]

A bluetooth headset may be one solution.

See also