[Elecraft] K2: KAF2 Versus 2.2 kHz KSB2

[Don Wilhelm]

Michael,

I am using the 2.2 kHz filter on my KSB2 with the KAF2 and have noticed no
problems with the low pass filter.  There is a very slight difference in the
upper end of the audio when I measure the filters with Spectrogram (KAF2 in
vs. KAF2 removed), but it is not enough to cause me any concern and may even
be an advantage in actual on-the-air listening because it cuts some of the
high frequency hiss without reducing intelligibility.

73,
Don W3FPR

----- Original Message ----- 

>   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?
>