[Elecraft] Tight Skirts...

[Eric Swartz - WA6HHQ, Elecraft]

We designed the KDSP2 to improve ultimate SSB filter ultimate rejection 
in the K2.

The KDSP2, with its brick wall SSB filter settings, when cascaded after 
the KSB2 filter, totally eliminates any residual leakage from strong 
signals outside the passband. It also tightens the net filter shape 
factor. The ultimate rejection is 60-75 dB on the xtal filter, which 
means a strong residual off freq. signal will not activate the K2's AGC, 
allowing the DSP to do its job without signal degradation.

This is how I run my K2 and I hear no difference with strong off 
frequency signal blow-by between it and the other $3K+ rigs we have in 
the lab.  :-)

73, Eric  WA6HHQ


Larry Phipps wrote:
> Sounds like the age old debate in the hifi world about the "sweet" sound 
> of tube amplifiers vs. the "hard" sound of clearly superior modern solid 
> state amps.
> 
> Preferences aside about slopes and shape factors... I'd like to have 
> MUCH better ultimate rejection... and a true rf clipper would be a nice 
> addition, especially when using QRP.
> 
> Larry N8LP