Bom fim de semana a todos..<br> Durante uma pesquisa sobre os rádios Jingtong envontrei a mensagem que volu colocar aqui. É util para quem năo quer ser icomodado com o beep no arranque do Rádio.<br><br><div style="margin-top: 12px;" align="right">
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<h1 style="margin-bottom: 3px;"><a href="http://radiosyelectronica.terapad.com/index.cfm?fa=contentNews.newsDetails&newsID=19512&from=list" rel="bookmark">Modding el Jingtong JT 208</a></h1>
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<span class="tip">Sunday, 20 May 07 - 07:30 PM (GMT +01:00)</span><br>
<span class="tip">By Fraser Cairns in <a href="http://radiosyelectronica.terapad.com/index.cfm?fa=contentNews.news&directoryId=5855">Radios VHF</a></span>
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<p>Modding the Jingtong JT208 annoying start up tone<br><img alt="" src="http://radiosyelectronica.terapad.com/resources/4266/assets/images/Jingtong/Jingtong.JPG" align="top" border="0" height="154" width="200"><br></p>
<p><br>Here is the faboulous jt-208 transceiver (136-174 mhz) and it's
mod to cancel or reduce that annoying tone coming up at startup. <br></p>
<p>First of all, this beep removing operation is a little bit delicated
so is required a good practice with smt component
soldering/desoldering. Do not attempt to do it if you have never opened
any electronic device. <br></p>
<p><img alt="" src="http://radiosyelectronica.terapad.com/resources/4266/assets/images/Jingtong/jingtong%20mod%202.jpg" align="middle" border="0" height="183" width="200"><br></p>
<p>About the opening of the case you can refer to this <a href="http://www.users.on.net/%7Eendsodds/dissem.htm">link.</a> <br></p>
<p>Once you have removed the cover, you have to desolder the 2 ground
link that solder together the 2 board of the transceiver. Then, look at
the other side of the keyboard , you will see near the mic and the
speaker hole, a little smt transistor, which is used to amplify the
beep signal coming from the pin 12 of the micro. Between that
transistor and the mic there are an smt capacitor and a resistor . <br></p>
<p>That capacitor bring the beep signal coming from cpu to the audio
stage.To reduce the tone volume you have to substitute that capacitor
with one of 5Kpf better if smt package. <br></p>
<p><img alt="" src="http://radiosyelectronica.terapad.com/resources/4266/assets/images/Jingtong/jingtong%20mod1.jpg" align="middle" border="0" height="150" width="200"><br></p>
<p>Be carefull in desoldering and soldering, use the minimal necessary
temperature to not brake the link. If you completely remove the
capacitor you will never hear any beep even from keyboard pressing.
After that, carefully reinsert the 2 connectors that link together the
two boards and re-solder the ground link to both side. <br></p>
<p>Re-assemble everything together with care, following the instuction given from the same link given above. <br></p>
<p>Now try it, if you think it's still too hi, you can use any other capacitor value between 1k and 10 kpf (Low- Hi volume beep).<br>Good luck.</p>
<br><br>73´s <br>Paulo Mendes - CT2HQT<br>