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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>I was getting TX hum about a year ago on
the APRS dedicated rig. Turned out to be a failed power supply. Switched it
to the other supply that runs the HF rig and it was fine. The bad supply had a
filter go bad. Voltage was fine so no obvious failure.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>73, ---Ken W2KB<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
aprssig-bounces@lists.tapr.org [mailto:aprssig-bounces@lists.tapr.org] <b><span
style='font-weight:bold'>On Behalf Of </span></b>Patrick Green<br>
<b><span style='font-weight:bold'>Sent:</span></b> February 27, 2006 14:36<br>
<b><span style='font-weight:bold'>To:</span></b> <st1:PersonName w:st="on">TAPR
APRS Mailing List</st1:PersonName><br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [aprssig] Problems with
hum on TX audio.</span></font><o:p></o:p></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='margin-bottom:12.0pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>Yes, that's now on the
list to try. Also going to put the radio and TNC both on battery power
since the hum is 60 hertz.<br>
<br>
73 de Pat --- KA9SCF.<o:p></o:p></span></font></p>
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<p class=MsoNormal><span class=gmailquote><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'>On 2/27/06, <b><span style='font-weight:bold'>w0ep</span></b>
<<a href="mailto:w0ep@frii.com">w0ep@frii.com</a>> wrote:</span></font></span><o:p></o:p></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><br>
<br>
Is it possible to try the 2200 with the microphone, just to<br>
key it up and see if you get the hum? That might remove<br>
the cable and/or TNC from the equation.<br>
<br>
<br>
<br>
<br>
<br>
<br>
_______________________________________________ <br>
aprssig mailing list<br>
<a href="mailto:aprssig@lists.tapr.org">aprssig@lists.tapr.org</a><br>
<a href="https://lists.tapr.org/cgi-bin/mailman/listinfo/aprssig">https://lists.tapr.org/cgi-bin/mailman/listinfo/aprssig</a>
<o:p></o:p></span></font></p>
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