David,

Yes, you need the 6kHz filter for ESSB. The 2.8kHz filter will strip it down to 2.8kHz.

73,
Don W3FPR

On 1/29/2016 8:07 PM, David Ahrendts wrote:
Am I correct that you do not achieve 4.0 kHz ESSB (widest TX with the K3S) 
without selecting the 6.0 kHz crystal filter for SSB TX? Just want your 
affirmation. :—)


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