[Elecraft] K3 1.0 KHz filter for CW - Needed?

[K4IA at aol.com]

And - remember you can set the filter to engage at a different DSP  width.  
Since the roofing filter has a fairly wide skirt you might want it  to engage 
earlier.   For example, I have my 500hz filter engage when  the DSP is at 
750hz.  That way, I get the roofing advantage earlier but can  still hear signals 
in the DSP passband.

Alternatively you might want the  roofer to engage later.  I can see not 
engaging the 1khz filter until you  got the DSP down below 1khz.  
 
Buck
k4ia 
K3# 101


In a message dated 1/12/2009 5:22:38 P.M. Eastern  Standard Time, 
n5ge at n5ge.com writes:
On Mon, 12 Jan 2009 08:37:21 -0700, you  wrote:

>I recently added this filter to my K3 to go with the 2.7 KHz  and 500 Hz
>filters it already has.  These are roofing filters so  there is a
>question of whether or not they're needed - or even if they  make a
>difference you can hear.
> 
>I've spent time tuning  the bands (mostly 40) with my filter width set to
>1.1 KHz and 1.0 KHz,  listening to the difference as the crystal filter
>is engaged.  Is it  needed?  I'd usually no.  Does it make a difference?
>Most  definitely!
> 
>I greatly prefer to operate with the 1.0 KHz filter  engaged.  I can keep
>my DSP bandwidth wider while still rejecting  noise from 2 KHz away.  The
>overall level of grunge in the receiver  goes down when the crystal
>filter kicks in.  I used to run with the  DSP set to about 700 Hz to get
>the overall sound I wanted.  With the  crystal filter, I can open the DSP
>to 1000 Hz and get the same or more  rejection of signals several KHz
>away.  
> 
>- Keith  N1AS -
>- K3 711 -

With the selectivity the K3 has the 1k filter  opens up just enough to
allow you not to miss weak stations while moving the  vfo up and down
the band.  That's what I use it for.

Tom,  N5GE


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