Greg, 

> The pinout is the same. You can take a hand mic from a 
> TS-870, 570 whatever and plug it into the K3 and it works fine.

Not true ... for example, the TS-570 manual says: 
  Compatible microphones include the MC-43S, MC-47, MC-60A, 
  MC-80, MC-85, and MC-90.

The MC-60A, MC-80, and MC-85 are all electret mics or have a 
built in preamplifier that requires power on pin 5 of the mic 
connector and a blocking capacitor in the microphone lead.  None 
of them will work with the K3 without modification.  The TS-870 
and TS-2000 have a similar list of "compatible" microphones. 

73, 

   ... Joe, W4TV 
 

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