I have both those filters, 2.7 and 2.8 and am able to crank the width to 4KHz. Also using WSJT-X and am able to adjust/widen the screen to 4KHz for both modes, works great!

73 Dwight NS9I

On 4/21/2014 9:52 AM, Joe Subich, W4TV wrote:

The only real concern for using the K3 with WSJT-X (JT65 and
JT9 simultaneously) is to make sure you get either the FM or
AM (13 KHz or 6 KHz) roofing filter so you can widen the RX
bandwidth to the full 4.2 KHz.  With a 2.7 or 2.8 KHz filter
you will be limited to one mode or the other and switching
between the two.

73,

   ... Joe, W4TV


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