[Elecraft] K3: Choosing which filters to buy

[G4ILO]

Shane White wrote:
> 
> Not having much CW experience and my current radio only using a 2.7KHz
> wide filter for CW (Rx only), I'm not sure which narrow filter to equip
> the K3 with. What's recommended for someone who will only use CW
> intermittently and not for contesting?
I would go for the 500Hz filter. I'm not sure that it is worth the extra for
the 400Hz, especially if your needs (like mine) are not all that demanding.
As has been pointed out, you have the DSP if you need narrower bandwidths.
But it does make a difference - nearby signals suddenly vanish when I get to
the 500Hz point.



> 2. Can users distinguish the difference between the 2.7KHz 5 pole filter
> and the 2.8KHz 8 pole filter when using the K3? I understand the skirts of
> the 8 pole filter's passband will be steeper but is this noticeable?
> 
I'd be interested to know that as well. I guess someone would have to
install both in the radio at the same time to see if there was a difference
(assuming that was possible and didn't confuse the firmware.) Has anyone
tried it?

When looked at on Spectrogram the 5-pole filter response bulges out on one
side at about 30dB down. A couple of people noticed it. But, again, you have
the DSP providing most of the selectivity, so it probably depends more on
how fussy you are and how willing to spend the extra bucks.

-----
Julian, G4ILO  K3 s/n: 222 K2 s/n: 392
G4ILO's Shack: www.g4ilo.com
KComm for K2/K3: www.g4ilo.com/kcomm.html
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