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:

• HHM1526
• HHM1523C1
• 04025A150JAT2A
• 04025A220JAT2A

Remove existing baluns¶

First you will need to remove existing balun:

Solder new baluns¶

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

Solder ceramic capacitors¶

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

Credits¶

Thanks to Sylvain and Peter who made this possible.