Posted by
K7TV on
Sep 22, 2018; 2:02am
URL: http://elecraft.85.s1.nabble.com/Choice-of-CW-pitch-tp7645246.html
The ease of changing CW pitch in the K3 is indeed a great asset in setting
things up for best copy, and I have found myself using it quite a few times.
The immediate reason to change pitch has usually been a perception that with
the existing setting, the best copy pitch does not exactly coincide with the
CW tuning indicator (another great CW asset of the K3), or with the peak DSP
filter response. Many times this has led me to change the pitch setting by a
small amount, whether my general preference du jour is for a low or higher
pitch. To make such an adjustment I like to set a wide DSP bandwidth and
slowly tune through a received signal. The apparent loudness doesn't stay
constant, nor does it follow a smooth variation that I attribute to my own
hearing response. Instead I hear peaks within range of piches that would be
reasonable for CW, that I attribute to the speaker and its surroundings. (I
would say that since I went to the SP3, there is less of this variation, but
no matter how good the speaker, there will always be such variations because
objects around the speaker cause reflections. Phones will always be the
better approach....) Rather than adjusting the pitch to some value
considered ideal based no prior considerations, I set it for a peak in the
accoustical response of the particular speaker and its surroundings. Then
going back to normal DSP selectivity I generally find better agreement
between perceived loudness and centering the received signal in the
passband, at least until I move things around in the shack...
73,
Erik K7TV
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