[Elecraft] [K3] Modification day for SN 01195

[Bill W4ZV]

Nick-WA5BDU wrote:
> 
> K3DSPLPF --- Active audio LPF to reduce artifacts in the audio chain, 
> add daughter board to DSP board
> 
> <SNIP>
> 
> I was most interested in the lowpass filter.  I'm no golden ear, but 
> possibly the power of suggestion made me think I heard some of the 
> harshness others described.  I found myself cranking the bandpass way 
> down toward the low end.  At least preliminarily, I think I do notice 
> the improvement in the quality of the sound (I work CW) with the LPF 
> installed.
> 

http://www.elecraft.com/order_form_parts.htm

K3DSPUPGD   	 Improves low freq RX/TX audio response below 300 Hz, and adds
a Low Pass Filter (LPF) that rolls off RX audio above 4 kHz.

K3DSPLPF   	 Small LPF add on SMD board for earlier K3 DSP boards that adds
a Low Pass Filter to roll off RX audio above 4 kHz. This is already included
on the K3DSPUPGD (above)

I believe it's the DSP mod which improves audio response at the low end. 
The DSPLPF rolls off audio artifacts above 4 kHz.  

I use low pitch settings of 300-440 Hz and have considered both mods but
haven't yet decided it's worthwhile.  Without having two units (one with and
one without) to compare, it's tough to know whether I'd notice any
difference.

73,  Bill

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