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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:

motorola_filter_replacement_step_1_low.jpg motorola_filter_replacement_step_2_low.jpg

Solder new baluns

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

motorola_filter_replacement_step_3_low.jpg motorola_filter_replacement_step_4_low.jpg motorola_filter_replacement_step_5_low.jpg

Solder ceramic capacitors

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

motorola_filter_replacement_step_6_low.jpg motorola_filter_replacement_step_7_low.jpg

Credits

Thanks to Sylvain and Peter who made this possible.

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