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Filter Replacement » History » Version 11

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zecke2, 02/19/2016 10:48 PM
We don't sell the kits anymore


Motorola filter replacement

In order to use the phone as a passive uplink sniffer, you will have to remove and replace the RX filters.

To replace filters on Motorola phones you will need:

=== Remove existing baluns ===

First you will need to remove existing balun:

Image(motorola_filter_replacement_step_1_low.jpg, 250px)
Image(motorola_filter_replacement_step_2_low.jpg, 250px)

=== Solder new baluns ===

Clean up the phone and solder HHM1526 and HHM1523C1 on the right places (the black dot goes up):

Image(motorola_filter_replacement_step_3_low.jpg, 250px)
Image(motorola_filter_replacement_step_4_low.jpg, 250px)
Image(motorola_filter_replacement_step_5_low.jpg, 250px)

=== Solder ceramic capacitors ===

Last step is to solder ceramic capacitors 04025A150JAT2A and 04025A220JAT2A:

Image(motorola_filter_replacement_step_6_low.jpg, 250px)
Image(motorola_filter_replacement_step_7_low.jpg, 250px)

=== Credits ===

Thanks to [http://246tnt.com/gsm/rx_filter.html Sylvain] and Peter who made this possible.

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