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