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Filter Replacement » History » Version 12

zecke2, 02/19/2016 10:49 PM
We don't sell the kits anymore

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h2. Motorola filter replacement
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In order to use the phone as a passive uplink sniffer, you will have to remove and replace the RX filters.
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To replace filters on Motorola phones you will need:
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* "HHM1526":http://search.digikey.com/scripts/DkSearch/dksus.dll?vendor=0&keywords=HHM1526
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* "HHM1523C1":http://search.digikey.com/scripts/DkSearch/dksus.dll?vendor=0&keywords=HHM1523C1
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* "04025A150JAT2A":http://search.digikey.com/scripts/DkSearch/dksus.dll?vendor=0&keywords=04025A150JAT2A
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* "04025A220JAT2A":http://search.digikey.com/scripts/DkSearch/dksus.dll?vendor=0&keywords=04025A220JAT2A
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h3. Remove existing baluns
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First you will need to remove existing balun:
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{{thumbnail(motorola_filter_replacement_step_1_low.jpg, size=250)}}
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{{thumbnail(motorola_filter_replacement_step_2_low.jpg, size=250)}}
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h3. Solder new baluns
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Clean up the phone and solder HHM1526 and HHM1523C1 on the right places (the black dot goes up):
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{{thumbnail(motorola_filter_replacement_step_3_low.jpg, size=250)}}
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{{thumbnail(motorola_filter_replacement_step_4_low.jpg, size=250)}}
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{{thumbnail(motorola_filter_replacement_step_5_low.jpg, size=250)}}
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h3. Solder ceramic capacitors
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Last step is to solder ceramic capacitors 04025A150JAT2A and 04025A220JAT2A:
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{{thumbnail(motorola_filter_replacement_step_6_low.jpg, size=250)}}
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{{thumbnail(motorola_filter_replacement_step_7_low.jpg, size=250)}}
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h3. Credits
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Thanks to "Sylvain":http://246tnt.com/gsm/rx_filter.html and Peter who made this possible.
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