Oh yes it is there on many SSB signals where the OP is a male. That is
where most of the fundamental male voice energy occurs. Those signals
which look uniform across the SSB TX bandpass do sound good.
I attribute this to the fact most hams will "boost this and boost that"
and never give thoughts to attenuating. In fact the characteristics of
the EQ in the boost mode are noticeable different than the attenuate
mode. Yes, one can hear the difference.
In my world of pro audio, it is a practice to attenuate first and then
boost if absolutely necessary. Hams just can't get over the fact they
must always have more.......boost boost boost.
So if ones signal is muddy or bassy, what's to do? Attenuate the low
end first, and rarely if ever, boost the high end. Of course boosting
the high end will make it brighter, but not attenuating the low end will
consume lots of unnecessary transmitter power not being used for
effective communications. 50Hz - 16dB, 100Hz -16dB, 200Hz - 16dB, 400Hz
- 9dB, 800Hz - 0dB, 1.6kHz - 0dB, 2.4kHz +0dB, 2.4kHz +3dB, 3.2kHz + 6 dB.
Works for me.
73
Bob, K4TAX
On 5/20/2022 4:30 PM, elecraft-requ...@mailman.qth.net wrote:
Message: 8
Date: Thu, 19 May 2022 02:14:10 +0000 (UTC)
From: Al Lorona<alor...@sbcglobal.net>
To: Elecraft Reflector<elecraft@mailman.qth.net>
Subject: [Elecraft] [OT] The dreaded 400 Hz hump
Message-ID:<1840135010.161126.1652926450...@mail.yahoo.com>
Content-Type: text/plain; charset=UTF-8
Have you studied how SSB signals look on your panadapter? I believe about 90%
of all phone signals have a very pronounced peak at about 400 or 500 Hz. This
peak is sometimes 10 dB (or more) higher than the rest of the bandwidth. This
is wasted power and, to my ear, makes signals sound muddier.
On the other hand, every once in a while you'll see a signal that has a more or
less flat frequency response, without any huge peaks. Sometimes, a signal will
actually have slightly*more* power in the higher frequencies, say, 2000 Hz and
higher. I've noticed that these signals have much more articulation and punch.
But these signals are all too scarce.
It's pretty well known that the aging population of hams collectively suffers
from a high frequency hearing loss. It seems to me that this is even more
reason to carefully shape your frequency response and cut the dreaded 400 Hz
hump.
R,
Al? W6LX/4
--
IF ONE EXPECTS COMPUTERS AND TECHNOLOGY TO SOLVE THEIR PROBLEMS,
ONE DOESN'T UNDERSTAND COMPUTERS AND TECHNOLOGY
AND ONE DOESN'T UNDERSTAND THEIR PROBLEMS."
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