[Elecraft] K3 Filter questions

[k.igor at comcast.net]

I am pretty sure the DSP filter is effective only  if it is narrower than the roofing filter. In your setup the DSP filter is pretty much  turned off. Please, don't forget, the crystal filters in K3 are ROOFING filters, they are protecting next IF stages and the DSP from strong near by signals, improving dynamic range . The main filtering is done in DSP. There is white paper on the matter somewhere on Elecraft web site (by Eric S). 



73, 

Igor, N1YX 



----- Original Message -----


From: "Dave Hachadorian" <k6ll at arrl.net> 
To: "Elecraft Reflector" <elecraft at mailman.qth.net> 
Sent: Tuesday, March 27, 2012 12:52:51 PM 
Subject: Re: [Elecraft] K3 Filter questions 

I used the 1.8 for the entire WPX SSB contest, with a DSP width 
of 2.1 KHz.  It sounded great.  I never messed with any of the 
settings for the entire contest.  To get this combination of 
DSP=2.1 and crystal=1.8, one has to install the 1.8 filter as if 
it were a 2.1, so it switches in at DSP=2.1.  This installation 
setup is most easily done using the K3 Utility.  In practice, 
normalize, then use high cut until the filter switches in.  To 
me, the audio sounds best using that technique.  WPX SSB is 
traditionally the worst-case QRM-fest, and the 1.8 filter was 
just the ticket for dealing with it. 

Dave Hachadorian, K6LL 
Yuma, Arizona 


>From experience, I had both the 2.1 and 1.8 fitted and by 
>judicious use of 
the Hi Cut/Lo Cut adjustment I find the 1.8 far better in 
practice. 

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