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Filter Replacement » History » Version 9

nion, 02/19/2016 10:48 PM
add background information on filter replacement

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== Motorola filter replacement ==
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In order to use the phone as a passive uplink sniffer or even as a BTS, 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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 * [http://search.digikey.com/scripts/DkSearch/dksus.dll?vendor=0&keywords=HHM1526 HHM1526]
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 * [http://search.digikey.com/scripts/DkSearch/dksus.dll?vendor=0&keywords=HHM1523C1 HHM1523C1]
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 * [http://search.digikey.com/scripts/DkSearch/dksus.dll?vendor=0&keywords=04025A150JAT2A 04025A150JAT2A]
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 * [http://search.digikey.com/scripts/DkSearch/dksus.dll?vendor=0&keywords=04025A220JAT2A 04025A220JAT2A]
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As the shipping cost for such a small-quantity order is relatively high, a complete component kit is
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 available for online order from http://shop.sysmocom.de/products/osmocombb-filter-kit
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=== Remove existing baluns ===
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First you will need to remove existing balun:
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[[Image(motorola_filter_replacement_step_1_low.jpg, 250px)]]
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[[Image(motorola_filter_replacement_step_2_low.jpg, 250px)]]
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=== 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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[[Image(motorola_filter_replacement_step_3_low.jpg, 250px)]]
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[[Image(motorola_filter_replacement_step_4_low.jpg, 250px)]]
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[[Image(motorola_filter_replacement_step_5_low.jpg, 250px)]]
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=== Solder ceramic capacitors ===
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Last step is to solder ceramic capacitors 04025A150JAT2A and 04025A220JAT2A:
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[[Image(motorola_filter_replacement_step_6_low.jpg, 250px)]]
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[[Image(motorola_filter_replacement_step_7_low.jpg, 250px)]]
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=== Credits ===
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Thanks to [http://246tnt.com/gsm/rx_filter.html Sylvain] and Peter who made this possible.
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