[Elecraft] K3: Is Width of Notch-Filter adjustable in some reasonable amount?

[Joe Subich, W4TV]

 > Instead of using a notch filter, how about narrowing the DSP filter
 > width to select the signal that you want.

The problem is that both solutions occur *after* the A/D converter in
the radio!  One wants to get rid of the "big signal" or the multitude
of moderate signals before they saturate the ADC (or activate HAGC)
in order to maintain maximum sensitivity for the weak signals.

73,

    ... Joe, W4TV


On 9/23/2013 1:40 PM, Don Wilhelm wrote:
> Bob,
>
> Instead of using a notch filter, how about narrowing the DSP filter
> width to select the signal that you want.
> Look on the waterfall for the audio frequency of the signal of interest
> and adjust the SHIFT to that center frequency, then narrow the width to
> isolate that signal.
>
> It is much more effective in reducing the strong unwanted signals than
> attempting to notch them.
>
> 73,
> Don W3FPR
>
> On 9/23/2013 12:22 PM, KD7YZ Bob wrote:
>> On Monday Zilmer used a Straight-Key to send:
>> -------------Original Comment-------
>>> I didn't word that quite right....  CW = continuous carrier.  It's
>>> very good for SW BC carriers, but not intended for broader signals
>>> like power supply gudge.
>> nah, ya got it right ... there's a bunch of PSK-like tones as well as a
>> few spaced WSPR signals .... especially in the early morning. At that
>> time, for me, and on a 300 foot DP, they are really annoyingly strong. I
>> can neatly notch most, but the roughly 200Hz width would be neat if I
>> could make it wider or narrower ... like a surgical removal of
>> CW/Narrow-PSK modes/ WSPR
>>
>> was just wondering. My K3 does so many things, most of them I haven't
>> discovered. Found nil in the manual; had to ask here "just in case".
>>
>>
>
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