[Elecraft] K2 and K3 Microphone Input Impedance

[George & Jan]

John,
I would not select a radio on the input impedance of the microphone input!
It is not critical at all - should be at least 10 times the microphone 
impedance.

Pro-Audio from as far back as the antique Western Electric unbalanced 
systems of the 40s tend to be in the range of 1 k to 10 k. Mostly depends on 
what the designer wants to emphasize. Lower would tend to reduce noise 
pick-up. Higher would tend to load the mic less thus improving S/N. Probably 
neither value is significant.

George
AI4VZ

-----Original Message----- 
Was there a compelling reason for having different termination values, 10k
vs. 1k, between transceiver model lines?