Hello Michael,
I like the characteristics of the passive filter used on the KAF2, so I
removed the components and used them to build the same circuit which I
placed at the output of my KDSP2 module. I am using KI6WX's 2.5 kHz
bandwidth mod, and am very pleased with the results. However, as John
himself stated, you should be sure to place switch S1 on the KAF2 into
the 'Bypass' position when using Spectrogram to make measurements, to
avoid the additional rolloff.
73, Dale WA8SRA
Linden, Mike (BRC-Hes) wrote:
I plan on building my KSB2 to KI6WX's 2.2 kHz crystal filter bandwidth
specifications (which is now the current Elecraft bandwidth). Should I shift
the KAF2's low-pass filter roll-off higher in frequency when I build it to
account for the increased bandwidth of the KSB2, or will the low-pass
roll-off be adequate as is?
Thanks, Michael N9BDF
K2 #4137
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