Karsten Eppert(DK4AS) wrote:
I am in doubt about the optimum CW-pitch. I think I remember from the
old days, that the human ear has the best "built in" filter around 1000
Hz, so I thought, CW-crystal filters should have a pitch around 1000 Hz.
Many commercial units seem to have 800 Hz, the standard K2 has a
suggested pitch of 600 Hz.
1. why is that so?
Many people seem to feel that the ear's filter is better at lower
pitches. A reason sometimes given is that the percentage difference
between two signals a given distance apart is greater at lower pitches
(e.g., a difference of 100 Hz. is 10% of 1000 Hz. and 20% of 500 Hz.),
but this is based on a guess about how the ear/brain actually works!
There is also the question of what pitch is least tiring to listen to,
and in general, more comfortable. Older people tend to like lower
pitches. It also depends on the characteristics of the audio system. I
personally have my K2 set to 550 Hz.
2. I have set my K2 to 700 Hz but live with the very personal (not
supported by spectrogram) impression that the overall
selectivity-response is broader than it could be. Is it possible, that
the NF-path is optimised for a 600 Hz-response? If so, I would go
through the entire re-alignement procedure and reset everything to 600
Hz. Or is it all stupid personal impression?
The IF selectivity is the same regardless of audio pitch. I suggest
trying different pitches and seeing which you like. The spectrogram
process gets faster every time you do it!
--
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco
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