[Elecraft] K3 Filter Advice

[Joe Subich, W4TV]

> I think narrow digitals like PSK 31 work well with cw 
> filters like 400 or 200 Hz.  Anyone have a preference?  
> For Rtty, are the cw filters too narrow?  

The "200 Hz" filter is definitely too narrow for RTTY 
which really needs about 270 Hz to properly pass both 
tones.  The 250 Hz (really about 370 Hz), 400 Hz (about 
430 Hz) and 500 Hz (about 480 Hz in my radios) are all 
good for RTTY.  

Given the relatively small difference among the 500, 
400, and 250 Hz filters there is no reason to have 
more than one of them.  My choice was the 500 Hz plus 
the 200 Hz for very crowded conditions on CW. 

73, 

   ... Joe, W4TV 
 



> -----Original Message-----
> From: elecraft-bounces at mailman.qth.net 
> [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Fred Wolf
> Sent: Tuesday, October 28, 2008 11:26 AM
> To: elecraft at mailman.qth.net
> Subject: [Elecraft] K3 Filter Advice
> 
> 
> I have just completed my K3 Kit, S/N 01817, and installed the 
> stock 2.8 kHz filter and the 8-pole 2.1 kHz filter.  Thinking 
> these would handle my SSB needs for the beginning.  I plan to 
> also operate Rtty and digital modes, and I wonder if there 
> are suggestions for the best filters.  I think narrow 
> digitals like PSK 31 work well with cw filters like 400 or 
> 200 Hz.  Anyone have a preference?  For Rtty, are the cw 
> filters too narrow?  Any advise is welcomed.
>  
> Fred Wolf
> N9WF at sbcglobal.net
>