[Elecraft] K3: honest question re Audio Peak Filter

DOUGLAS ZWIEBEL dougzzz at gmail.com
Thu Dec 31 13:24:29 EST 2009


RE: Audio Peak Filter requests

A number of folks have asked for this, including some who have not
commented here.  Many of these guys obviously used a "audio peak
filter" before, found it useful, and now miss it.

As before, I have no issues with any requests, as long as they are
user-selectable as OPTIONS and not mandatory.

But I have to ask why for this one.  It has been my experience that
one uses an audio peak filter when the IF filtering is inadequate...it
is "another layer" of support (rejecting "unwanted" signals).  But hey
guys...the stock K3 goes down to a 50hz bandwidth...at IF and AF (if I
understand the DSP correctly).  Fifty HERTZ!

I think that is a just as narrow (if not much narrower) and with as
steep skirts (if not steeper) than you will ever find on the Audio
Peak Filtering on any past or current radio.

Not only can you narrow down the DSPs to 50hz, but you can also set
the "pitch" to whatever you like.  Doesn't that do the same thing
(only better)?

QUESTIONS: Are you sure that you actually need this?  Have you tried
the method cited above?  Why/how would an audio peak filter be
"better" or a further enhancement?

Thanks and Happy New Year!
de Doug KR2Q
PS...recently I posed another such comment on a different topic and I
got some very good answers which taught me at least one new trick...so
this is definitely not a sarcastic question.


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