[Elecraft] K3 filter ringing at 50Hz

[Ted Roycraft]

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 
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Elecraft at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>
>