[Elecraft] K3 and WSJT-X Split operation.

[Jim Brown]

Hi Frank,

Something seems not right. The output stage of many (most?) computer 
sound cards is usually also used to drive headphones, and typically 
provide at least a volt, which is approximately line level for consumer 
devices, and output Z is usually fairly low (<500 ohms).  In the audio 
world, inputs are, by convention, high impedance (>10K). Did the radio 
designer screw up and stick a low value resistor across the line input?

My general advice is to run the computer sound card about 6 dB below 
clip, because it is common for distortion to rise by 10 dB with that 6 
dB difference in output level. How much drive does that rear panel Line 
In need?

73, Jim K9YC

On 12/5/2017 5:50 PM, donovanf at starpower.net wrote:
> I have the same problem with inadequate audio from my sound card
> when I use the rear panel Line In connector. But it works great if
> I use the front panel microphone connector.