[Elecraft] Re: K3 Beta Firmware Release -- MCU Revision 2.19

[wayne burdick]

Hi Buck,

This information didn't make it to the rev C manual. It will be in the 
next revision:

* * *

Narrow DSP Filter Types

For bandwidth settings of 100 Hz or lower, the K3’s DSP normally uses a 
type of filter that minimizes ringing: the Finite Impulse Response or 
FIR filter.

If you don’t mind a small amount of ringing, you can select Infinite 
Impulse Response or IIR filters for these bandwidths, which have 
steeper skirts. Locate the CONFIG:FLx BW menu entry, then tap 7 until 
you see IIR ON. Both main and sub receivers will use the same setting.

* * *

73,
Wayne
N6KR


On Jul 22, 2008, at 7:49 PM, K4IA at aol.com wrote:

> In a message dated 7/22/2008 8:37:37 P.M.  Eastern Daylight Time,
> n6kr at elecraft.com writes:
> * IIR DSP FILTER ON/OFF  SELECTION now applies to both main and sub
> receivers. (IIR  filter on/off is selected by tapping the ‘7’ switch
> while in  the
> FLx BW menu entry. IIR filters apply only to 100 Hz and  narrower DSP
> bandwidths. They have slightly more ringing than  the default FIR
> filters.)
>
> Can you explain more about this. I don't  see a reference to IIR DSP 
> FILTER
> in the manual.  And, why would I want to  chose a filter with slightly 
> more
> ringing?
>
> k4ia
> "Buck" K3  #101
> Fredericksburg, VA
>
>
>
>
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