I had a hearing test a year, or two ago. I looked at the test results
and selected a frequency, looking for good response in both ears. I
then adjusted the K3 beat note to that frequency, which put the
frequency of the beat tone in the sweet spot for my ears... It also in
general got most stations I was working at that frequency.
It made a noticeable difference for the better in weak signal decoding
for CW for me... YMMV.
73s and thanks,
Dave (NK7Z/NNR0DC)
https://www.nk7z.net
ARRL Technical Specialist
ARRL Volunteer Examiner
ARRL OOC for Oregon
On 9/22/18 4:40 AM, Drew AF2Z wrote:
When you've got a weak signal peaked in a narrow filter or APF, that's
the time you'd like to optimize the pitch. Adjusting the VFO/RIT for a
different pitch is not really an option at that point.
You're right though, PITCH as implemented is mainly meant to pick your
favorite tone and pretty much stick with it; not for trimming up
individual signals like you would with AF/RF gain.
73,
Drew
AF2Z
On 09/22/18 07:11, Nr4c wrote:
Come on!!!
I adjust the “pitch” to suit my hearing. The pitch of the incoming
station is adjusted by the VFO! The “Spot” button will get you close
to Zero-Beat. A little XIT will separate you from others who Zero-Beat
him in a pile-up.
Sent from my iPhone
...nr4c. bill
On Sep 22, 2018, at 6:39 AM, Drew AF2Z <[email protected]> wrote:
Yes, the K3 cw pitch is easy to set tailor for hearing response and
speaker/headphone response; at least easier than the K2. For my K2 I
had written down the filter calibrations for a number of different
pitches so that I could change them on the fly while operating; I
recall it took less than a minute to dial one of them in...
But if you want to adjust the pitch to suit current band conditions,
filter width and wpm speed of the station you are trying to copy, the
K3 is not easy at all.
Let's assume that for any combination of these variables there is
some optimum CW pitch between 300 - 800 Hz. How do you find that
pitch for a particular CW signal? There is no easy way because
whenever you push the PITCH button you can no longer hear the station
your are trying to optimize. You would have to try every pitch
selection individually, 300, 310, 320, etc., and somehow remember
which was the best. Obviously, not a practical way to dial in the
optimum value.
73,
Drew
AF2Z
On 09/21/18 22:02, Erik Basilier wrote:
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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