[Elecraft] K3 #1456 - data modes setup

[Jim Brown]

On Thu, 28 Aug 2008 10:51:57 -0400, Joe Subich, W4TV wrote:

> As long and Line Out 
>remains below roughly 1V peak (about .8V RMS) distortion levels 
>will be minimal.  

Not quite. Because most of the distortion is caused by the 
transformer, distortion rises rapidly with decreasing frequency 
(that's the nature of transformers at the limits of their ratings). 
If you're running RTTY at narrow bandwidths, using 2.2 kHz tones, 
and paying attention to the AGC considerations noted below, you're 
not likely to have problems at this level. But if you're running 
PSK31 with a typical wideband filter, the low frequency components 
(static, noise, other signals) could produce enough distortion to 
degrade operation of the PSK decoder (in the computer sound card). 

>The specific Line Out setting will depend on your particular 
>AGC settings.  If AGC is off, an S9 signal (XG1/XG2, etc.) 
>will generate 1V peak with Line Out as low as 3 or 4. 

Yes.

Jim Brown K9YC