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[RFI] RFI in MC60 Microphone

To: <rfi@contesting.com>
Subject: [RFI] RFI in MC60 Microphone
From: Brad Johnson" <bradj1@cswnet.com (Brad Johnson)
Date: Sun, 28 Jan 2001 21:53:14 -0600
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I have used my Kenwood MC 60 mic with four different radios -- TS 440, =
TS 450, TS 950, and TS 2000. Two things are consistent -- good audio and =
rfi problems. I solved problems before with rf chokes on mic cord, but =
this one a different animal...rfi introduced when I touch the mic stand. =
Removing base plate from mic stand eliminates problem...removed =
batteries, no effect, played around with bypass caps, but either didn't =
get them in correct place or they aren't effective. Currently in process =
of changing antenna feed system ( from ladder line to balun outside =
shack) but I also want to attack problem at mic. I know several people =
have had problems with rfi and MC 60's and I have been searching the net =
for specific modifications, but without luck. If anyone has dealt with =
this successfully, or can direct me to mods I would appreciate it.

73,

Brad
AA5CH

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<DIV><FONT face=3DArial size=3D2>I have used my Kenwood MC 60 mic =
with&nbsp;four=20
different radios -- TS 440, TS 450, TS 950, and&nbsp;TS 2000. Two things =
are=20
consistent -- good audio and rfi problems. I solved problems before with =
rf=20
chokes on mic cord, but this one a different animal...rfi introduced =
when I=20
touch the mic stand. Removing base plate from mic stand eliminates=20
problem...removed batteries, no effect, played around with bypass caps, =
but=20
either didn't get them in correct place or they aren't effective. =
Currently in=20
process of changing antenna feed system (&nbsp;from ladder line&nbsp;to =
balun=20
outside shack) but I also want to attack problem at mic. I know several =
people=20
have had problems with rfi and MC 60's and I have been searching the net =
for=20
specific modifications, but without luck. If anyone has dealt with this=20
successfully, or can direct me to mods I would appreciate =
it.</FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>73,</FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>Brad</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>AA5CH</FONT></DIV></BODY></HTML>

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