[Elecraft] K2-Bias Resistor When Using Mic Connector Pin 1 for Soundcard Input

[Geert Jan de Groot]

On 07/04/2023 23:48, elecraft-request at mailman.qth.net wrote:
> I'd like to connect a sound card output to a K2 mic connection. Does
> this bias resistor need to be removed when I connect the sound card
> output?

Electret microphones, like the MH2, MH3, MH4 require a bias voltage to 
function. On the K2, this is done by "adding a 5K6 resistor between pin 
1 and 6". That also works on the K3, but the K3 also has an option in 
the menu to set enable a bias resistor in the rig - if you do that, you 
don't need the physical resistor but you need to remember to do the setting.

Personally, I worry about the chance of doing this wrong (either bias 
for a soundcard or a dynamic microphone, or forgetting the bias on an 
electret) and hence said 5K6 bias resistor is in the microphone plug. If 
I plug in an electret microphone, it will get bias, if I plug on 
something else, I don't need to worry, and this will work on K2 and K3, 
w/o any menu setting changes.

Geert Jan