[Elecraft] K3 Filter IMD numbers

[Julian G4ILO]

I take it from the comments so far that these are pretty good. :) As
someone who knows more about PHP than IMD, could you give us the "for
dummies" version?

As someone whose main interests will be QRP PSK31 and CW, not serious
contesting, which if any of these narrower filters would I benefit
from?

Also, there doesn't seem to be a lot to choose between the 2.7kHz 5
pole and the 2.8kHz 8 pole filter. I'm assuming that the former is the
standard filter - what benefit would actually be observed using the
latter?

-- 
Julian, G4ILO K2 s/n: 392  K3 s/n: ???
G4ILO's Shack: www.g4ilo.com
Ham-Directory: www.ham-directory.com


On 9/13/07, Eric Swartz - WA6HHQ, Elecraft <eric at elecraft.com> wrote:
> Here you go! These are recent measurements from our lab.
>
> Filter            20kHz  10kHz  5kHz  2kHz
> 200 Hz, 5 pole    100+   100+   100+   95
> 250 Hz, 8 pole    100+   100+   100+   95
> 400 Hz, 8 pole    100+   100+   100+   95
> 500 Hz, 5 pole    100+   100+   100+   94
> 1 kHz, 8 pole     100+   100+   100    94
> 2.7 kHz, 5 pole   100+   98      92    n/a
> 2.8 kHz, 8 pole   100+   100     93    n/a
>
> These are typical numbers and may vary a couple of dB from radio to
> radio or filter to filter.
>