[Elecraft] K3/K3S: How to adjust SSB receive bandwidth up to 4.0 kHz

[Bill Frantz]

While working in this part of the firmware, could 4K receive 
passband be made to work with the 13KHz FM filter as well?

Thanks, Bill AE6JV

On 5/12/16 at 10:03 AM, n6kr at elecraft.com (Wayne Burdick) wrote:

>The K3's SSB receive passband can be widened to as much as 4.0 
>kHz if you have a 6.0 kHz crystal filter. This is useful for 
>ESSB in particular. However, there's a minor problem with the 
>present firmware that requires a workaround (for now).
>
>The trick is that you have to have LO/HI CUT selected rather 
>than SHIFT/WIDTH. If you select LO/HI CUT, then NORMalize the 
>passband, you can adjust HI CUT to as high as 4.00, and the 
>DSP's bandwidth will be set up accordingly.
>
>If you have WIDTH/SHIFT selected, you may only be able to get 
>the DSP's bandwidth up to 3.50 kHz, even though the display 
>says 4.00.

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