[Elecraft] Filters for K3

[Don Wilhelm]

Dave and all,

Your observation is exactly the reason I use HI and LO CUT for SSB.  
Typically one only needs to decrease HI CUT and the center frequency 
takes care of itself.  When the HI CUT gets so low that intelligibility 
is beginning to decay, a slight change upward in LO CUT can improve 
things, but normally LO CUT is a "set and forget" control for SSB - mine 
normally stays at 0.15, 0.20 or 0.25.
Try it and I would wager that most of you struggling with the WIDTH and 
SHIFT for SSB will never go back.

73,
Don W3FPR

David Gilbert wrote:
> I agree that shifting the FC is very important when using narrow filters 
> on SSB.  For a while Inrad was selling 1.5 KHz 8-pole filters for really 
> narrow SSB and I bought a pair for my K3.  They work great as long as I 
> drop the FC down to 1.05 KHz. 
>
> In extreme cases I've even narrowed the DSP filter down to as low as 1.1 
> Khz and shifted FC to about 0.95, but that only works for some voices.
>
> Which brings up another observation I've made ... for any given WIDTH, 
> the optimum FC for best intelligibility will be different depending upon 
> the characteristics of the voice you are trying to copy.  I can go an 
> entire contest without changing the WIDTH, but I often adjust the SHIFT 
> to dig out a difficult one.
>
> 73,
> Dave   AB7E
>   
>