[Elecraft] K3: CW weak signal

[Ted Roycraft]

Hi Ken,

For narrow DSP filter bandwidths (100 Hz or less I think) you have the 
option of using a FIR filter (default) or an IIR filter.  IIR filters 
can "ring" which sounds like it might be what you are experiencing.  
That may be your problem - that you are using an IIR filter.  You can 
toggle between the FIR and IIR filters by a CONFIG command; CONFIG->FLx 
BW  (then tap 7).  (See page 55 of the K3 manual under FLx BW.)    Hope 
that helps.

73, Ted, W2ZK

Kenneth Waites wrote:
> When on low bands, weak signal, rf gain cranked up, narrow CW bandwidth, I get a bit of continuous howling effect from the white noise/QRN that is about the same audio freq as the signal I am copying.
>  
> I have .2 khz, 5 pole -.94 crystal.
>  
> I have always just ignored it, turning rf gain down helps a bit - very critical.  But I started thinking maybe others have found some good techniques to minimize this.  As I write this I think I may experiment with the boost I give for this crystal.  Wondering if 8 pole crystals sound diferent.
>  
> Any suggestions?
>  
> Ken K5WK
>  
>  
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