Project

General

Profile

Filter Replacement » History » Version 10

nion, 02/19/2016 10:48 PM

1 1 luka12345
== Motorola filter replacement ==
2 1 luka12345
3 10 nion
In order to use the phone as a passive uplink sniffer, you will have to remove and replace the RX filters.
4 9 nion
5 1 luka12345
To replace filters on Motorola phones you will need:
6 1 luka12345
7 1 luka12345
 * [http://search.digikey.com/scripts/DkSearch/dksus.dll?vendor=0&keywords=HHM1526 HHM1526]
8 1 luka12345
 * [http://search.digikey.com/scripts/DkSearch/dksus.dll?vendor=0&keywords=HHM1523C1 HHM1523C1]
9 1 luka12345
 * [http://search.digikey.com/scripts/DkSearch/dksus.dll?vendor=0&keywords=04025A150JAT2A 04025A150JAT2A]
10 1 luka12345
 * [http://search.digikey.com/scripts/DkSearch/dksus.dll?vendor=0&keywords=04025A220JAT2A 04025A220JAT2A]
11 1 luka12345
12 6 zecke2
As the shipping cost for such a small-quantity order is relatively high, a complete component kit is
13 6 zecke2
 available for online order from http://shop.sysmocom.de/products/osmocombb-filter-kit
14 5 laforge
15 5 laforge
16 2 luka12345
=== Remove existing baluns ===
17 2 luka12345
18 2 luka12345
First you will need to remove existing balun:
19 2 luka12345
20 2 luka12345
[[Image(motorola_filter_replacement_step_1_low.jpg, 250px)]]
21 2 luka12345
[[Image(motorola_filter_replacement_step_2_low.jpg, 250px)]]
22 2 luka12345
23 2 luka12345
=== Solder new baluns ===
24 2 luka12345
25 2 luka12345
Clean up the phone and solder HHM1526 and HHM1523C1 on the right places (the black dot goes up):
26 2 luka12345
27 2 luka12345
[[Image(motorola_filter_replacement_step_3_low.jpg, 250px)]]
28 2 luka12345
[[Image(motorola_filter_replacement_step_4_low.jpg, 250px)]]
29 2 luka12345
[[Image(motorola_filter_replacement_step_5_low.jpg, 250px)]]
30 2 luka12345
31 3 luka12345
=== Solder ceramic capacitors ===
32 2 luka12345
33 4 luka12345
Last step is to solder ceramic capacitors 04025A150JAT2A and 04025A220JAT2A:
34 2 luka12345
35 2 luka12345
[[Image(motorola_filter_replacement_step_6_low.jpg, 250px)]]
36 2 luka12345
[[Image(motorola_filter_replacement_step_7_low.jpg, 250px)]]
37 2 luka12345
38 2 luka12345
=== Credits ===
39 2 luka12345
40 8 stuge
Thanks to [http://246tnt.com/gsm/rx_filter.html Sylvain] and Peter who made this possible.
Add picture from clipboard (Maximum size: 48.8 MB)