There's a process in the owners manual for adjusting dB loss compensation for 
the roofing filters. You can see it with the k3 utility

On September 18, 2015 4:57:39 PM EDT, "Joe Subich, W4TV" <li...@subich.com> 
wrote:
>
>Jamie,
>
>What is the offset (FL# FRQ)?
>
>What is the PITCH in the K3S vs. MARK in your RTTY software?
>
>73,
>
>    ... Joe, W4TV
>
>
>On 9/18/2015 3:30 PM, James C. Hall, MD wrote:
>> Working with my newly constructed K3S today, I noticed that receiving
>through the FL4 crystal filter (400 hz, 8-pole) was noticeably
>suppressed. Through the FL3 (1.8 kHz) filter, an RTTY signal would be
>nice and strong with good S-meter indications. Going to 400 Hz the
>signal would nearly be lost and I could not decode it. Going to FL5
>(250 Hz), the S-meter would pick up again with strong signals.
>>
>> There's not much to check on the Config menu except the FL4 GN and
>it's at max (8 db) - not much change.
>>
>> Is there something else I should do to deal with this ?
>>
>> 73, Jamie
>> WB4YDL
>>
>> Sent from my iPad
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