[Elecraft] K3s rear mic connector and shure SM58.

[Jim Brown]

On 10/3/2017 11:50 AM, Stewart wrote:
> Is anyone using a Shure SM58 mic with their K3s?

The SM58 is a poor choice for ham radio because of its bass boost. It 
should work if it's wired correctly, but it will be too bassy.

> If so are you using a preamp? My O'scope shows that the mic and cable 
> are good but level is pretty low.

No preamp is needed. Follow manual for menu setting for Mic Gain to High.

>
> I don't get anything with the mic connected to the rear mic jack. 
> Config is set to rp l , bias off. I tried mic gain from 0 - 100. 

My guess is that the cable is not wired to mate with the K3. Study the 
pin-out in the K3S manual. From the balanced mic, connect one of the 
signal wires to Mic In, the other signal wire to Mic Return, and the 
cable shield to the chassis.

73, Jim K9YC