[Elecraft] K3 sidetone level

[Peter Lascell]

Try the AFX button on the K3, to change the audio phase.


On Thu, Nov 14, 2024 at 11:51 PM Jim Brown <jim at audiosystemsgroup.com>
wrote:

> On 11/14/2024 1:15 PM, Bob McGraw wrote:
> > I find the physical position of my head and ears related to the position
> > of the two speakers can produce a null in the sound, especially with a
> > tone.
>
> Because it's a single tone, this is the same phenomena that causes what
> we call "selective fading" on the AM band and picket fencing at VHF-UHF.
> It's all about the travel time from the two speakers to our ears; if
> we're dead center between them, the wavefronts from the two speakers add
> because they're precisely in phase (zero degrees difference); as we move
> closer to one than the other, the phase difference (measured in degrees)
> increases and the don't add as perfectly and eventually begin cancelling
> each other; when that difference reaches 180 degrees, they cancel
> perfectly.
>
> At radio frequencies, the fading between peaks and cancellations occurs
> because we're receiving the signal over different paths, thus with
> different travel times. The difference in speed at which the signal
> peaks and dips between what happens at the AM BC frequencies and the
> much higher VHF/UHF frequencies is wavelength.
>
> In the world of pro audio, we were forced to learn the difference
> between phase (a continuously valued function that varies both with
> frequency and time) and POLARITY, which is REVERSING the signal, like
> reversing a pair of wires carrying the signal, or running it through an
> inverting gain stage. In the world of audio, the "signal" is not only
> one frequency/wavelength, but thousands of them. So the cancellation or
> addition varies from one note to the next. If were to plot that on a
> graph, it would look like a comb pointing upward, and it can impart a
> certain un-natural-ness to the sound.
>
> 73, Jim K9YC
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-- 
Pete Lascell
Forest, VA