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<DIV><SPAN class=971104403-25112007><FONT face=Arial color=#0000ff size=2>Found
it - Switch mode power supply noise</FONT></SPAN></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial
size=2>----------------------------------------------------------------------------</FONT></DIV>
<DIV><FONT face=Arial size=2>Andrew Rich VK4TEC</FONT></DIV>
<DIV><FONT face=Arial size=2><A
href="mailto:vk4tec@people.net.au">vk4tec@people.net.au</A></FONT></DIV>
<DIV><FONT face=Arial size=2><A
href="http://www.tech-software.net/">http://www.tech-software.net</A></FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<BLOCKQUOTE dir=ltr style="MARGIN-RIGHT: 0px">
<DIV class=OutlookMessageHeader dir=ltr align=left><FONT face=Tahoma
size=2>-----Original Message-----<BR><B>From:</B> Andrew Rich
[mailto:vk4tec@people.net.au]<BR><B>Sent:</B> Sunday, 25 November 2007 12:16
PM<BR><B>To:</B> Aprssig<BR><B>Cc:</B> ozaprs<BR><B>Subject:</B> ICOM 706 MKii
G Packet experience.<BR><BR></FONT></DIV>
<DIV><SPAN class=877001002-25112007><FONT face=Arial
size=2>Gudday</FONT></SPAN></DIV>
<DIV><SPAN class=877001002-25112007><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=877001002-25112007><FONT face=Arial size=2>I thought I would
share this experience - others may be able to help.</FONT></SPAN></DIV>
<DIV><SPAN class=877001002-25112007><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=877001002-25112007><FONT face=Arial size=2>I bought a
KPC3 for 1200 baud to use outboard with the ICOM 706 Mk
iiG</FONT></SPAN></DIV>
<DIV><SPAN class=877001002-25112007><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=877001002-25112007><FONT face=Arial size=2>Seemed to work
well enough - using the "data" port on the ICOM 706. I seemed to be copying
most packets on ISS and PCSAT.</FONT></SPAN></DIV>
<DIV><SPAN class=877001002-25112007><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=877001002-25112007><FONT face=Arial size=2>I then migrated to
AGWPE sound card and I noticed that it was not copying packets
100%.</FONT></SPAN></DIV>
<DIV><SPAN class=877001002-25112007><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=877001002-25112007><FONT face=Arial size=2>I had a look on
the Sound Card tuning aid and I saw something odd.</FONT></SPAN></DIV>
<DIV><SPAN class=877001002-25112007><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=877001002-25112007><FONT face=Arial size=2>It looked like
1200/2200 but was sort of riding on a low frequency sine wave, in that the
packet tones where not symetrical about zero volts.</FONT></SPAN></DIV>
<DIV><SPAN class=877001002-25112007><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=877001002-25112007><FONT face=Arial size=2>OK, time to drag
out the CRO. Sure enough saw the same thing on the CRO.</FONT></SPAN></DIV>
<DIV><SPAN class=877001002-25112007><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=877001002-25112007><FONT face=Arial size=2>Time to try
something different - the "phones" connection on the front panel - perfect
nicely balanced packet.</FONT></SPAN></DIV>
<DIV><SPAN class=877001002-25112007><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=877001002-25112007><FONT face=Arial size=2>Fiddled with the
9600 / 1200 baud lines and settings in the ICOM 706. Not much
joy.</FONT></SPAN></DIV>
<DIV><SPAN class=877001002-25112007><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=877001002-25112007><FONT face=Arial size=2>Before I dig
deeper (service manual), anybody seen similar ?</FONT></SPAN></DIV>
<DIV><SPAN class=877001002-25112007><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=877001002-25112007><FONT face=Arial size=2>I wondered why my
SATGATE was not hearing as much.</FONT></SPAN></DIV>
<DIV><SPAN class=877001002-25112007><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=877001002-25112007><FONT face=Arial size=2>Seems the outboard
TNC was more tolerant of the mucked up waveform ?</FONT></SPAN></DIV>
<DIV><SPAN class=877001002-25112007><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=877001002-25112007><FONT face=Arial size=2>Cheers
</FONT></SPAN></DIV>
<DIV><SPAN class=877001002-25112007><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=877001002-25112007><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial
size=2>----------------------------------------------------------------------------</FONT></DIV>
<DIV><FONT face=Arial size=2>Andrew Rich VK4TEC</FONT></DIV>
<DIV><FONT face=Arial size=2><A
href="mailto:vk4tec@people.net.au">vk4tec@people.net.au</A></FONT></DIV>
<DIV><FONT face=Arial size=2><A
href="http://www.tech-software.net/">http://www.tech-software.net</A></FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
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