Recently I experimented with the TX equalization on my OMNI-VII by
attenuating the lows and increasing the highs. What I found was, it didn't
help, at least in contests it didn't, even with the amp on. I get better and
unsolicited reports with the TX equalization set for flat!
73 es DX,
Gary - AB9M
From: Dr. Gerald N. Johnson
Sent: Monday, December 06, 2010 1:02 PM
Subject: Re: [TenTec] Speech to Text
Interesting point. I see newbies tuning just to the point they can copy
and the audio sounds to be 200 or 300 Hz off frequency which doesn't
improve copy and is far enough off tune with a transceiver they often
don't get copied on the other end during an operation like FD.
It is nicer to tune for the most natural sounding voice. I base that on
harmonics of the low pitches of the voice matching the high frequency
components. I think this is the fundamental of the best SSB tuning, that
the harmonic voice components truly are at the harmonic of the
fundamental. Same thing when tuning SSB broadcast music. There that
accurate tuning is more critical to my musical ears.
I don't have any hardware or software procedures for that tuning, but
I'd think about maybe showing the spectral components as received with
the harmonics of the lower voice frequency components multiplied
mathematically in a different color so the operator could tune the
receiver so the harmonics of the low pitches matched the transmitted HF
components. Not transmitting those harmonics and the gap between them
and the fundamentals is one scheme used to narrow voice communications.
Perhaps a SSB auto tuner could be developed based on matching the harmonics.
73, Jerry, K0CQ
On 12/6/2010 12:01 PM, email@example.com wrote:
> This just occurred to me: How would a deaf person tune in a SSB
> signal? You can see a CW signal on the spectrum of CW Sweeper and
> other CW reading programs; likewise for PSK and RTTY. But I can't
> imaging how you would tune in a SSB signal without hearing it. Just
> lining it up within a spectral range wouldn't work, because of
> differences in mics, audio processors, propagation, speakers, etc.
> Since speech-to-text software uses harmonic relationships to
> discriminate among sounds (I believe) being off by more than a few Hz
> could keep it from working at all.
> I sometimes have trouble tuning in sideband (I am hearing-impaired,
> but not deaf), so if there's a way to augment the tuning process, I'd
> be very interested.
> 73, Frank KF6E _______________________________________________
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