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<DIV><FONT size=2 face=Arial><SPAN class=078073308-24022013>Hi
All,</SPAN></FONT></DIV>
<DIV><SPAN class=078073308-24022013><FONT face=Arial><SPAN
class=468582402-23022013></SPAN></FONT> </DIV>
<DIV>
<DIV><FONT size=2 face=Arial><SPAN class=468582402-23022013>I use Hermes by
using External 10MHz clock.</SPAN></FONT></DIV>
<DIV><SPAN class=468582402-23022013></SPAN><SPAN class=468582402-23022013><SPAN
class=468582402-23022013><FONT face=Arial><FONT size=2>Recently I noticed
receiving CW tonality abruptly changed in a very very short period.<SPAN
class=078073308-24022013> It's very
subtle.</SPAN></FONT></FONT></SPAN></SPAN></DIV>
<DIV><SPAN class=468582402-23022013><FONT size=2 face=Arial><SPAN
class=468582402-23022013></SPAN></FONT></SPAN> </DIV>
<DIV><SPAN class=468582402-23022013><FONT size=2 face=Arial><SPAN
class=468582402-23022013><SPAN class=078073308-24022013>Then
I hooked a probe of an oscilloscoe on JP20 to see the shapes of
the clock, when External or Internal.</SPAN></SPAN></FONT></SPAN></DIV>
<DIV><SPAN class=468582402-23022013><FONT size=2 face=Arial><SPAN
class=468582402-23022013><SPAN class=078073308-24022013>The differecne
between the both is quite apparent, the output level of
two transistor's wave shapping circuit for External clock is
low.</SPAN></SPAN></FONT></SPAN></DIV>
<DIV><SPAN class=468582402-23022013><FONT size=2 face=Arial><SPAN
class=468582402-23022013><SPAN
class=078073308-24022013></SPAN></SPAN></FONT></SPAN> </DIV>
<DIV><SPAN class=468582402-23022013><FONT size=2 face=Arial><SPAN
class=468582402-23022013><SPAN class=078073308-24022013>By sharing this
phenomenon with Phil, VK6APH, I changed the value of R141 from original 100
ohms to 51 ohms.</SPAN></SPAN></FONT></SPAN></DIV>
<DIV><SPAN class=468582402-23022013><FONT size=2 face=Arial><SPAN
class=468582402-23022013><SPAN class=078073308-24022013>The result is OK, the
level is almost same as External clock's one.</SPAN></SPAN></FONT></SPAN></DIV>
<DIV><SPAN class=468582402-23022013><FONT size=2 face=Arial><SPAN
class=468582402-23022013><SPAN
class=078073308-24022013></SPAN></SPAN></FONT></SPAN> </DIV>
<DIV><SPAN class=468582402-23022013><FONT size=2 face=Arial><SPAN
class=468582402-23022013><SPAN class=078073308-24022013>According to the
schematics of Hermes as well as BOM, R141 is 100 ohms, but in my case it doesn't
work properly.</SPAN></SPAN></FONT></SPAN></DIV>
<DIV><SPAN class=468582402-23022013><FONT size=2 face=Arial><SPAN
class=468582402-23022013><SPAN
class=078073308-24022013></SPAN></SPAN></FONT></SPAN> </DIV>
<DIV><SPAN class=468582402-23022013><FONT size=2 face=Arial><SPAN
class=468582402-23022013><SPAN class=078073308-24022013>If you use External
clock, check the value of R141 and see the clock shape of JP20 at
JP20 if an oscilloscope is available.</SPAN></SPAN></FONT></SPAN></DIV>
<DIV><SPAN class=468582402-23022013><FONT size=2 face=Arial><SPAN
class=468582402-23022013><SPAN
class=078073308-24022013></SPAN></SPAN></FONT></SPAN> </DIV>
<DIV><SPAN class=468582402-23022013><FONT size=2 face=Arial><SPAN
class=468582402-23022013><SPAN class=078073308-24022013>If there is a difference
compared with Internal clock shape, I recommend you to change the value of R141
to 51 ohms.</SPAN></SPAN></FONT></SPAN></DIV>
<DIV><SPAN class=468582402-23022013><FONT size=2 face=Arial><SPAN
class=468582402-23022013><SPAN
class=078073308-24022013></SPAN></SPAN></FONT></SPAN> </DIV>
<DIV><SPAN class=468582402-23022013><FONT size=2 face=Arial><SPAN
class=468582402-23022013><SPAN
class=078073308-24022013>73,</SPAN></SPAN></FONT></SPAN></DIV>
<DIV><SPAN class=468582402-23022013><FONT size=2 face=Arial><SPAN
class=468582402-23022013><SPAN class=078073308-24022013>Tokio
Endo</SPAN></SPAN></FONT></SPAN></DIV>
<DIV><SPAN class=468582402-23022013><FONT size=2 face=Arial><SPAN
class=468582402-23022013><SPAN
class=078073308-24022013>JA1CCA</SPAN></SPAN></FONT></DIV>
<DIV>
<DIV><FONT size=2 face=Arial><SPAN
class=468582402-23022013></SPAN></FONT> </DIV>
<DIV><FONT size=2
face="ＭＳ Ｐゴシック"></FONT> </DIV></SPAN></DIV></SPAN></DIV></BODY></HTML>