[Kenwood] ts850 rf feedback

[W7lr@aol.com]

I am using a TS850 MC60 mike and PK232MBX for rtty.  With the cable plugged 
into the TS850 acc2 jack from the TNC, there is rf feedback when trying to 
use the mike on ssb.  The only cure to use ssb is to unplug the cable from 
acc2.  I tried ferrite beads and shielding on the cable to no avail.  When I 
qso VK4SJ and mentioned the rf feedback problem she asked if I were using a 
TS850 and a MC60 mike before she knew my setup - it must be a common problem! 
 She said the only cure was to throw away the MC60 mike.  Without the rtty 
cable plugged in, the TS850 audio quality is outstanding and I very often 
receive comments on how good it is.  I looked in the service manual and it 
appears that the TS850 already has adequate bypass capacitors on the acc2 
connections.  I looked in the Kenwood archives and didnt see any discussion 
of this problem.  Is there any cure other than unplugging the cable or 
throwing the mike away?  73 Bob W7LR in MT          w7lr@aol.com