On Feb 25, 2010, at 9:47 PM, John Williams wrote:
On Thu, Feb 25, 2010 at 7:37 PM, Nick Arnett <[email protected]>
wrote:
However, some of
the spectrum is still restricted to CW (code) only.
Right, the masochist channels :-) Or, perhaps, the apocalypse
practice channels.
There's actually an interesting tangent here, by the way, on the
subject of single sideband (SSB) reception and transmission. SSB
effectively translates a slice of spectrum either up from or down to
audio baseband more or less intact (inverted in the case of LSB), and
it's amazing what your ears can learn to figure out just from what you
hear in that slice of spectrum, especially with tuning up and down the
dial.
And the possibilities only multiply when you feed that audio from the
radio into, say, the sound card of a computer, and vice versa.
DigiPan is only one of a nearly infinite number of possible examples
of that. All the DSP capability of your computer interfaced quite
elegantly with that old Hallicrafters tube rig from the attic and
maybe an audio interface with an audio-triggered transmit relay. I
don't know about you, but I find that thought rather exciting. :D
(And an interesting experiment: Feed the I and Q outputs of a
quadrature detector to a pair of stereo headphones. Apparently the
brain's auditory cortex is wired in a way that takes unique advantage
of that format. And you're literally *listening to signals on the
complex plane*. What's not cool about that?)
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