[Elecraft] K3 microphone wiring ?

[Don Wilhelm]

Barry,

I believe the K3 comes permanently wired for the Elecraft microphones, 
and that means there is a resistor between 5 volts and pin 1 (AF).  If 
one wants to use a microphone that would object to having that voltage 
present on pin 1, a series DC blocking capacitor should be used.

My reasons to support those conclusions are the fact that Lyle said the 
K3 mic is wired just like it would be in the K2 with all jumpers wired 
straight across, coupled with the fact that the MH2 microphone is again 
being offered for use with the K2 and K3 - if it did not require the 
resistor, I would expect to see a change in the microphone numbering 
designation.

73,
Don W3FPR

Barry McWilliams wrote:
> Thanks for the additional information in the FAQ about microphones.
> But I still have a question.
> 
> The wiring for the K2 MD-2, MH-2 microphones and the Heil headset has 5V 
> applied to pin 1 through a 5.6k resistor.
> 
> Will the K3 be able to supply 5V on pin 1 through a 5k resistor via a 
> jumper or some sort of configuration option?  If not, I don't think the 
> current Elecraft microphones will work properly.
> 
> Thanks,  Barry (WK2S)