[Elecraft] K3S Shift Setting for WSJTX

[Tom-KQ5S]

Thanks Joe.  Mike, W9MDB, sent me a procedure using WSJTX to determine the
cutoff points.  I  arrived at exactly what you are saying.  I am using 1500
and find that I can copy JT9 out to 3000 and if a stronger signal out to
about 3300.



73,
Tom - KQ5S

On Tue, Jul 4, 2017 at 7:25 AM, Joe Subich, W4TV <lists at subich.com> wrote:

>
> I am using a width of 4 khz and using the radio in split mode.
>>
> Width of 4 KHz is useless with a 2800 Hz SSB filter.  You do not
> need (and can't use) more than 3000 - 3300 Hz.
>
> The default shift of 1500 (for DATA A) will provide relatively
> flat audio response from 300 Hz to 2800 Hz with Width at 3000 Hz.
> If you move the shift to 1700 the "flat area" of the audio pass-
> band will be about 300 to 3000 Hz.
>
> Remember, with a 2800 Hz filter the maximum bandwidth is 2800 Hz
> between the -3 dB points.  Setting a wider DSP filter is not going
> to make the flat are any wider it will only allow you to see more
> of the filter skirts.  If you really need the full 4 KHz get an
> AM (6 KHz) or FM (13 KHz) filter.
>
> 73,
>
>    ... Joe, W4TV
>
>
> On 7/2/2017 3:50 PM, Tom-KQ5S wrote:
>
>> Hope this is not a dupe.  I sent it over an hour ago and nothing showed
>> up.
>>
>> I am trying to tweak my WSJTX setup.  What is the recommended shift for
>> the
>> K3S while running WSJTX?  I have the 2.8 khz SSB filter installed.  I am
>> using a width of 4 khz and using the radio in split mode.
>>
>>
>> 73,
>> Tom - KQ5S
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