[Elecraft] Good Low Cost Audio to USB Interfaces For Digital Modes

[Jim Brown]

On 3/24/2012 2:48 PM, Pierfrancesco Caci wrote:
> Interesting. If it has more gain, isn't it more likely to saturate,
> given that the radio has a Line level output? Your suggestion seems
> counterintuitive to me, I must be missing something.

The words "Line Level" are pretty elastic. In the consumer audio world, 
that means a PEAK value of 1V. In the pro audio world, it means a peak 
value of 10-20V. Also, early production K3s (the first couple of years, 
which i have) have a design error that caused the output transformers to 
create distortion if you ran the Line Out much above about 10. That 
means that to keep the distortion low you need to keep the output below 
about 100 mV peak, which is sort of marginal to drive the Numark.

The simple network I described introduces both some attenuation and the 
desired equalization, and the result is that if you run the K3 Line Out 
fairly low nothing gets overloaded.

73, Jim K9YC