Docbooks for various parts of OsmocomBB
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<?xml version="1.0" encoding="UTF-8"?>
<!--
ex:ts=4:sw=4:sts=4:et
-*- tab-width: 4; c-basic-offset: 4; indent-tabs-mode: nil -*-
-->
<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd" [
]>
<book>
<bookinfo>
<revhistory>
<revision>
<revnumber>0.0.1</revnumber>
<date>12 December 2011</date>
<authorinitials>z</authorinitials>
<revremark>Initial</revremark>
</revision>
</revhistory>
<title>Motorola C1XX Filter Replacement</title>
<copyright>
<year>2011</year>
</copyright>
<legalnotice>
<para>This work is licensed under a Creative Commons Attribution 3.0
Unported License. To view a copy of this license, visit <ulink
url="http://creativecommons.org/licenses/by-sa/3.0/">http://creativecommons.org/licenses/by-sa/3.0/</ulink>
or send a letter to Creative Commons, 559 Nathan Abbott Way, Stanford,
California 94305, USA.</para>
</legalnotice>
</bookinfo>
<!-- Main chapters-->
<chapter>
<title>Motivation</title>
<para>The motivation to replace the baluns is to change the sensitivity of the RX path. TODO</para>
</chapter>
<chapter>
<title>Requirement</title>
<para>You will need to buy HHM1526, HHM1523C1, 04025A150JAT2A, 04025A220JAT2A (one each), patience,
soldering iron, tools, patience. Double check with the wiki page where you found this document.</para>
</chapter>
<chapter>
<title>Replacement</title>
<section>
<title>Step 1</title>
<para>Remove the two existing baluns.</para>
<figure><title>Step 1</title>
<mediaobjectco><imageobjectco>
<areaspec id="area_step1" units="calspair">
<area linkends="balun_1" coords="1000,2000 8800,6100" id="balun_1"/>
<area linkends="balun_2" coords="2000,2700 8800,6100" id="balun_2"/>
</areaspec>
<imageobject>
<imagedata fileref="images/motorola_filter_replacement_step_1_low.jpg" width="12cm" />
</imageobject>
<calloutlist>
<callout arearefs="balun_1" id="link_balun_1">
<para>The black (sometimes silver) component is the GSM900 balun. Remove it from the PCB.</para>
</callout>
<callout arearefs="balun_2" id="link_balun_2">
<para>The black (sometimes silver) component is the DCS1800 balun. Remove it from the PCB.</para>
</callout>
</calloutlist>
</imageobjectco>
</mediaobjectco>
</figure>
</section>
<!-- Section 2 -->
<section>
<title>Step 2</title>
<para>The balun should now be removed and you should see the traces.
</para>
<figure><title>Step 2</title>
<mediaobjectco><imageobjectco>
<areaspec id="area_step2" units="calspair">
<area linkends="s2_balun_1" coords="1000,5500 8800,6100" id="s2_balun_1"/>
<area linkends="s2_balun_2" coords="2000,6200 8800,6100" id="s2_balun_2"/>
</areaspec>
<imageobject>
<imagedata fileref="images/motorola_filter_replacement_step_2_low.jpg" width="12cm" />
</imageobject>
<calloutlist>
<callout arearefs="s2_balun_1" id="s2_link_balun_1">
<para>The RX path for GSM900 without the balun.</para>
</callout>
<callout arearefs="s2_balun_2" id="s2_link_balun_2">
<para>The RX path for DCS1800 without the balun.</para>
</callout>
</calloutlist>
</imageobjectco>
</mediaobjectco>
</figure>
</section>
<!-- Section 3,4 show the balun packaging and first solder attempt -->
<!-- Section 5 place new balun's -->
<section>
<title>Step 5</title>
<para>Place the new balun's on the PCB.</para>
<figure><title>Step 5</title>
<mediaobjectco><imageobjectco>
<areaspec id="area_step5" units="calspair">
<area linkends="s5_balun_1" coords="1700,2800 8800,6100" id="s5_balun_1"/>
<area linkends="s5_balun_2" coords="2700,3100 8800,6100" id="s5_balun_2"/>
</areaspec>
<imageobject>
<imagedata fileref="images/motorola_filter_replacement_step_5_low.jpg" width="12cm" />
</imageobject>
<calloutlist>
<callout arearefs="s5_balun_1" id="s5_link_balun_1">
<para>Place the HHM1523C1 (GSM 900) here</para>
</callout>
<callout arearefs="s5_balun_2" id="s5_link_balun_2">
<para>Place the HHM1526 (DCS 1800) here</para>
</callout>
</calloutlist>
</imageobjectco>
</mediaobjectco>
</figure>
</section>
<!-- Section 7 -->
<section>
<title>Step 7</title>
<para>Place capacitors</para>
<figure><title>Step 7</title>
<mediaobjectco><imageobjectco>
<areaspec id="area_step7" units="calspair">
<area linkends="s7_cap_1" coords="900,6900 8800,6100" id="s7_cap_1"/>
<area linkends="s7_cap_2" coords="2200,7900 8800,6100" id="s7_cap_2"/>
</areaspec>
<imageobject>
<imagedata fileref="images/motorola_filter_replacement_step_7_low.jpg" width="12cm" />
</imageobject>
<calloutlist>
<callout arearefs="s7_cap_1" id="s7_link_cap_1">
<para>Place one 22 pF (04025A220JAT2A) cap here.</para>
</callout>
<callout arearefs="s7_cap_2" id="s7_link_cap_2">
<para>Place one 15 pF (04025A150JAT2A) cap here.</para>
</callout>
</calloutlist>
</imageobjectco>
</mediaobjectco>
</figure>
<note><title>Different circuit</title><para>Sometimes the input (at the bottom of the balun)
is not with caps in series and a resistor in parallel. Instead it might be without the resistors
in parallel and resistors in series. Remove the resistors and place 2x the appropriate cap in
series (22 pF for GSM90, 15 pF for DCS1800).
</para></note>
</section>
</chapter>
<appendix id="step1">
<title>High Resolution Step 1</title>
<mediaobject><imageobject>
<imagedata fileref="images/motorola_filter_replacement_step_1_low.jpg" width="18cm" />
</imageobject></mediaobject>
</appendix>
<appendix id="step2">
<title>High Resolution Step 2</title>
<mediaobject><imageobject>
<imagedata fileref="images/motorola_filter_replacement_step_2_low.jpg" width="18cm" />
</imageobject></mediaobject>
</appendix>
<appendix id="step3">
<title>High Resolution Step 3</title>
<mediaobject><imageobject>
<imagedata fileref="images/motorola_filter_replacement_step_3_low.jpg" width="18cm" />
</imageobject></mediaobject>
</appendix>
<appendix id="step4">
<title>High Resolution Step 4</title>
<mediaobject><imageobject>
<imagedata fileref="images/motorola_filter_replacement_step_4_low.jpg" width="18cm" />
</imageobject></mediaobject>
</appendix>
<appendix id="step5">
<title>High Resolution Step 5</title>
<mediaobject><imageobject>
<imagedata fileref="images/motorola_filter_replacement_step_5_low.jpg" width="18cm" />
</imageobject></mediaobject>
</appendix>
<appendix id="step6">
<title>High Resolution Step 6</title>
<mediaobject><imageobject>
<imagedata fileref="images/motorola_filter_replacement_step_6_low.jpg" width="18cm" />
</imageobject></mediaobject>
</appendix>
<appendix id="step7">
<title>High Resolution Step 7</title>
<mediaobject><imageobject>
<imagedata fileref="images/motorola_filter_replacement_step_7_low.jpg" width="18cm" />
</imageobject></mediaobject>
</appendix>
</book>