1 | <?php |
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2 | $seiten_id = 'telefunkent40w'; |
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3 | $version = '$Id'; |
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4 | $titel = 'Telefunken T 40W'; |
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5 | |
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6 | require '../../lib/technikum29.php'; |
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7 | ?> |
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8 | |
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9 | <h2><?php print $titel; ?></h2> |
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10 | |
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11 | <div class="box center"> |
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12 | <div id="rel"> |
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13 | <img id="offen" src="/shared/photos/kommunikationstechnik/telefunken_t40w/offen.jpg" |
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14 | alt="Telefunken T40W: A photography of the inner life" /> |
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15 | <img id="zu" src="/shared/photos/kommunikationstechnik/telefunken_t40w/geschlossen.jpg" |
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16 | alt="Telefunken T40W: A photography of the closed device" /> |
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17 | <img id="beschriftung" src="/shared/photos/kommunikationstechnik/telefunken_t40w/beschriftung.en.png" |
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18 | alt="Telefunken T40W key: Labels of the amplifier stages, tubes, etc." /> |
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19 | </div> |
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20 | <div id="controls"> |
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21 | <noscript>Please switch on <b>javascript</b> in your browser |
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22 | to see the animation.</noscript> |
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23 | <div class="cols"> |
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24 | <div class="leftcol"> |
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25 | <input type="button" value="Abspielen" id="slider-button1" /> |
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26 | <div class="slider" id="slider01"> |
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27 | <div class="left"></div><div class="right"></div> |
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28 | <img src="/shared/js/slider/img/knob.png" width="31" height="15" /> |
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29 | </div> |
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30 | </div><!--left--> |
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31 | <div class="rightcol"> |
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32 | Use the slider to gain insight into the device or click |
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33 | on "start animation". |
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34 | </div><!--right--> |
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35 | <div class="clear"></div> |
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36 | </div><!--cols--> |
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37 | </div><!--controls--> |
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38 | </div> |
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39 | |
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40 | <p>The Telefunken broadcasting device Type 40W (year of manufacture 1929) is build |
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41 | aesthetically appealing. At that time, technology was comprehensible even for |
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42 | (educated) laymen. On the other hand, the operation was not very comfortable: |
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43 | The volume had to be adjusted by combining the antenna matching (the turn-switch |
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44 | on the left) and the feedback (turn-switch on the right). When the feedback was |
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45 | increased too much, the broadcasting reciever became an "jamming transmitter".</p> |
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46 | |
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47 | <div class="box center"> |
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48 | <img src="/shared/photos/kommunikationstechnik/telefunken_t40w/unterseite.jpg" |
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49 | width="750" height="388" alt="Telefunken 40W underside" /> |
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50 | </div> |
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51 | |
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52 | <p>The device looks good from below, too. It's built on a pressed paper sheet |
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53 | instead of a sheet chassis. Electrical connections are partially realized by |
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54 | rivet strip conductors. Not until the 1950s, that method was implemented again, |
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55 | leading to the printed circuit boards.</p> |
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56 | |
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