[Elecraft] FW: New customer message on December 14, 2018 at 02:22 AM

[Bill W4ZV]

"3.Are the audio filter options needed - would they enhance CW operation?? "

JMHO but I have a contrarian opinion on the KAF2.  I installed one but
resold it after several months of use.  I do a lot of weak signal work on
160 and have probably tried about every audio filter known to man.  The ONLY
one which actually helped me was the Audio Peak Filter (APF) first
implemented in Yaesu's FT-1000D as an analog circuit.  Elecraft, Icom and
others have now made digital clones of APF in their newer rigs (e.g. K3,
KX3, etc).  Besides APF, I don't believe there is a better audio filter than
your natural ear/brain combination.  I've often fooled myself into thinking
others helped but when I switched them off, I found there was no real S/N
improvement to my ears.  

Another issue I disliked about the KAF2 was the RFI generated by the clock. 
If the clock was enabled, there was a "chuff chuff chuff" sound in the audio
that was quite annoying (not to mention clock drift, the complexity of
setting time, etc).

Here are a few audio mods that I've made to my K2:

1.  TF3MA's sidetone mod.  This cleans up the sidetone to a more pure
sinusoid, allowing better zero-beating by ear.  Without it, I found it easy
to zero beat on a spurious product.  The improvement also does not fatigue
my ears as much as before during extended operating.  This one is definitely
worth doing in my opinion.

2.  TF3MA's LF audio cutoff mod.

3.  JG1XLZ's KSB2 audio quality mod.  (not needed for CW).

I don't have time to find links for these but you should be able to find
them in a keyword search.  They are all free and simple to install once you
have the parts.

73,  Bill  W4ZV



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