[Elecraft] [K2] poor IMD on barefoot K2, even at low power

[Julian, G4ILO]

Don Wilhelm-4 wrote:
> 
> Oleg,
> 
> With the K2, you should have zero ALC bars illuminated - reduce your 
> audio input level until the ALC bar does not illuminate.
> Are you using SSB mode?  If so, have you set the menu SSBC parameter
> to1:1?
> You can set up the RTTY filter set (turn RTTY=ON in the secondary menu), 
> and you will have a dedicated mode for soundcard data modes.  The 
> advantage is that the compression setting is independent of that used 
> for SSB.
> 

In DATA (RTTY) mode it is perfectly OK to have one ALC bar illuminated. I
believe that the K2s use a "soft" ALC in this mode, similar to the K3. When
set up this way my 10W K2 actually produces lower IMD (-34dB at 5W) than my
K3 at the same power level, and the ALC maintains the power level to that
requested across a wide range of audio frequencies.

On the other hand, I have found it almost impossible to measure IMD reliably
using sound card software. I measured it using the KK7UQ IMD meter.

-----
Julian, G4ILO. K2 #392  K3 #222.
* G4ILO's Shack - http://www.g4ilo.com
* KComm - http://www.g4ilo.com/kcomm.html
* KTune - http://www.g4ilo.com/ktune.html

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