[Elecraft] K3s AFSK frequencies

[n9tf at comcast.net]

I have had really good luck using the 500hz roofing filter and adjusting down to 400Hz with DSP for rag chewing. In contests I will adjust to 350 or even 300Hz, depending on how close signals get bunched together, with very good decode. 
I've also made adjustments to AGC, which have also been an improvement. AGC DCY - soft, AGC SLP - 6, AGC THR - 16. All other AGC settings at default. These settings in my location, seem to work the best for me so far. 
  
Gene, N9TF 
K3S 10057 

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

From: john at kk9a.com 
To: "elecraft" <elecraft at mailman.qth.net> 
Sent: Wednesday, April 13, 2016 8:56:06 AM 
Subject: Re: [Elecraft] K3s AFSK frequencies 

The optimal band width may depend on how crowded the band is. Wide 
filtering may work well for a DXer trying to copy a super weak signal on a 
quiet band. I only use RTTY in contests when the bands are packed and I 
have had great results using very narrow roofing filters. 

John KK9A 


from: Dave Hachadorian 
Tue Apr 12 23:54:57 EDT 2016 

Current thinking is to use a fairly wide filter for RTTY.  The 
software filters that are applied in the sound card are much 
narrower, about 50 Hz wide.  Lately I've been using the 2.7 KHz 
roofing filter, with DSP bandwidth set to about 600 Hz. 


Dave Hachadorian, K6LL 
Yuma, AZ 

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