I just finished the installation of the KAF2 audio filter into K2 S/N 1116.
I had purchased the K2 last year used and already built. I also upgraded the
firmware from rev 1.04d to rev 2.04.
All went smoothly, although I did lose the sidetone and it wasn't due to
selecting the wrong source as in a previous post. Based on a suggestion by
Ron AC7AC I re-seated the U6 chip in the socket and that seemed to work OK.
(Thank you for your very fast support, Ron).
I chose the KAF2 over the DSP filter since I operate primarily CW and still
want to keep the receive current as low as possible. I am very happy with
the performance of the filter. The clock is nice too!
One additional note. On page 12 of the KAF2 manual there is a reference to
a filter design book by Art Williams. I am privileged to be working with
Art right now in the design of filter-based DSL modem testing products. He
will be releasing the latest version of his book very shortly.
Since the subliminal message keeps flashing "buy more Elecraft stuff for the
K2" I will have to think about what option to get next.
73,
John W2XS
K2 #1116 with KSB2, KNB2, KAF2, KAT2, KBT2, FDIMP
KX1 #15 with KXAT1, KXPD1, KXB30
BL1
BL2
HexKey #113
DL1
N-gen
XG1
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