[Elecraft] K3 filter ringing at 50Hz

[Ted Roycraft]

Sorry, it's "tap 7" instead of "tap 1".

Ted

Ted Roycraft wrote:
> If you have selected the IIR filter using CONFIG:FLx BW - tap 1 (instead 
> of the default FIR filter), you are more likely to experience ringing 
> with narrow DSP filters.  See page 24 (Narrow DSP Filter Types) of the 
> K3 Owner's manual.
>
> 73, Ted, W2ZK
>
> K2MK wrote:
>   
>> I was wondering if anybody else has noticed this or is it just me. With 3.30 
>> firmware I am noticing some ringing on CW with the DSP bandwidth at 50Hz. It 
>> clears up at 100Hz. I don't remember hearing this with earlier firmware. I 
>> haven't tried reloading older firmware.
>>
>> I considered that this was a function of my listening to a lot of weak 
>> stations in noisy band conditions this past month while chasing DXpeditions. 
>> But today I have been on 20 meters in the CA QSO party. The band is quiet 
>> and the signals are strong but the ringing is still there at 50Hz. My narrow 
>> xtal filter is the 5 pole 200Hz filter and I am making these assessments 
>> with NR off and RX EQ flat.
>>
>> 73,
>> Mike K2MK 
>>
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