In sci.physics, Radium
gluceg...@gmail.com
wrote
on 29 May 2007 21:50:16 -0700
1180500616.639919.174...@r19g2000prf.googlegroups.com>:

On May 29, 7:46 pm, "Tomoko Kanazawa"
T.Kanaz...@eodomo.gsfc.nasa.gov> wrote:

Radios dont work in space. It's a VACKYOOM.

Yes they do. Sound cannot travel through space, however,
electromagnetic representations of audio signals can. The spaceship
has air in it [duh!, otherwise those onboard wouldn't survive] so
loudspeakers attached to the radio and amplifiers should give out some
sound. Right?

Well, congrats on knowing the basics, though you forgot three additional
possibilities.

[1] The electromagnetic waves could be converted to light pulses, which
would then feed a video receiver.

[2] The E/M waves could be fed directly into one's brain. This
admittedly slightly farfetched notion is presumably in the far future,
but it is theoretically possible.

[3] The E/M waves could be fed into piezoelectric crystals -- earphones
or earbuds.

There is also the possibility that the ship has no air but those aboard
it are using space suits.

In sci.physics, Michael A. Terrell
mike.terrell@earthlink.net
wrote
on Tue, 29 May 2007 06:40:54 GMT
465BCB0E.4B58C639@earthlink.net>:
The Ghost In The Machine wrote:

Yes; now we use something else that sounds even worse.
The current sounds remind me of some sort of low-speed
modem, as opposed to the two-toned whine used previously,
which sounded like a mutated dial tone.


That is EXACTLY what it is. An oddball, low baud rate modem. It was
done that way to make it addressable, and to keep it from being tampered
with by hackers or terrorists.



I don't know about the tampering, but I laud the change, at
least as far as the tests I've heard go; the initialization
signal is followed by an explanation -- "the radio stations
in cooperation with the FCC, etc." -- then a termination
signal, three short oddly-modulated beeps, in the same
general tonal region as the three longer warbly beeps.

Presumably, a decoder can pick up the audio signal
between these two beeps -- which would during the test
be simply an explanation of what the system is (namely,
for emergency broadcasts), but during a real emergency be
instructions that could be stored and then forwarded.

I don't have said decoder but I do have my ears. :-)

The older dual-tone did not have a "termination signal"
as such, which means one either has to shut off the radio
manually, or time out. Both are problematic.

--
#191, ewill3@earthlink.net
Linux. Because it's there and it works.
Windows. It's there, but does it work?

--
Posted via a free Usenet account from http://www.teranews.com

That is EXACTLY what it is. An oddball, low baud rate modem. It
was done that way to make it addressable, and to keep it from being
tampered with by hackers or terrorists.

I don't know about the tampering, but I laud the change, at
least as far as the tests I've heard go; the initialization
signal is followed by an explanation -- "the radio stations
in cooperation with the FCC, etc." -- then a termination
signal, three short oddly-modulated beeps, in the same
general tonal region as the three longer warbly beeps.

Presumably, a decoder can pick up the audio signal
between these two beeps -- which would during the test
be simply an explanation of what the system is (namely,
for emergency broadcasts), but during a real emergency be
instructions that could be stored and then forwarded.

I don't have said decoder but I do have my ears. :-)

The older dual-tone did not have a "termination signal"
as such, which means one either has to shut off the radio
manually, or time out. Both are problematic.

On May 29, 11:31 pm, The Ghost In The Machine
e...@sirius.tg00suus7038.net> wrote:

In sci.physics, Radium
gluceg...@gmail.com
wrote
on 29 May 2007 21:50:16 -0700
1180500616.639919.174...@r19g2000prf.googlegroups.com>:

On May 29, 7:46 pm, "Tomoko Kanazawa"
T.Kanaz...@eodomo.gsfc.nasa.gov> wrote:

Radios dont work in space. It's a VACKYOOM.

Yes they do. Sound cannot travel through space, however,
electromagnetic representations of audio signals can. The spaceship
has air in it [duh!, otherwise those onboard wouldn't survive] so
loudspeakers attached to the radio and amplifiers should give out some
sound. Right?

Well, congrats on knowing the basics, though you forgot three additional
possibilities.

Thanks.

[1] The electromagnetic waves could be converted to light pulses, which
would then feed a video receiver.

In which case, I wonder what would be seen on the screen.

[2] The E/M waves could be fed directly into one's brain. This
admittedly slightly farfetched notion is presumably in the far future,
but it is theoretically possible.

Extremely unlikely. The brain is too poor of a conductor to process
any electromagnetic signals.

Mostly the brain uses proteins to
transmit, receive, record, playback, store, and process signals.

There
is a long list of what determines those signals. This includes - but
is clearly not limited to - the types of proteins, the amounts of
proteins, the rate at which the proteins move, whether they move at
all, and a many other variables regarding proteins. Most CNS signals
are based on proteins, though many sci-fi thrillers tend to spread the
myth that the brain is purely-electric.

[3] The E/M waves could be fed into piezoelectric crystals -- earphones
or earbuds.

Yes.

There is also the possibility that the ship has no air but those aboard
it are using space suits.

Yes but even in this case, the space suit contains air, which is
necessary for the astronaut to survive. This air is what conducts the
sound produced by the loudspeakers the astronaut is wearing. The
loudspeakers generate the sound based on signals they receive via
radio waves.

Paul Cardinale pointed out that AM carrier waves as weak as 10^-10,000
watt [i.e. 10-to-the-power-NEGATIVE-10,000 watt] would mean "expect
photons to arrive at a rate of about one every 10^9964 years."

I am
now aware that my power requirements are way too low to receive
anything in a human lifetime. So let's increase the initial wattage of
the AM carrier wave to where it is equivalent to one 150 KHz photon
per second. Now, I can expect - after super-amplification and
subsequent demodulation -- to hear those terrifying yet enjoyable high-
pitched, heterodyne-like, EAS-resembling tones while on the spacecraft.

Tomoko Kanazawa wrote:

Radios dont work in space. It's a VACKYOOM.


You are wrong. Nasa has used frequencies from VHF high band into the
gigahertz range. I personally worked on the KU band audio, video and
data system aboard the ISS during the manufacturing process.

1.06016 * 10^-27 J / 10^-10000 = 1.06016 * 10^9973 s
= about 1 in every 3.3595 * 10^9965 years. He's off, but
not by a lot.

1.06016 * 10^-27 J / 10^-10000 = 1.06016 * 10^9973 s
= about 1 in every 3.3595 * 10^9965 years. He's off, but
not by a lot.

1.06016 * 10^-27 J / 10^-10000 = 1.06016 * 10^9973 s
= about 1 in every 3.3595 * 10^9965 years. He's off, but
not by a lot.

1.06016 * 10^-27 J / 10^-10000 = 1.06016 * 10^9973 s
= about 1 in every 3.3595 * 10^9965 years. He's off, but
not by a lot.

1.06016 * 10^-27 J / 10^-10000 = 1.06016 * 10^9973 s
= about 1 in every 3.3595 * 10^9965 years. He's off, but
not by a lot.

1.06016 * 10^-27 J / 10^-10000 = 1.06016 * 10^9973 s
= about 1 in every 3.3595 * 10^9965 years. He's off, but
not by a lot.

Paul Cardinale pointed out that AM carrier waves as weak as 10^-10,000
watt [i.e. 10-to-the-power-NEGATIVE-10,000 watt] would mean "expect
photons to arrive at a rate of about one every 10^9964 years." I am
now aware that my power requirements are way too low to receive
anything in a human lifetime. So let's increase the initial wattage of
the AM carrier wave to where it is equivalent to one 150 KHz photon
per second.

In sci.physics, Radium
gluceg...@gmail.com
wrote
on 30 May 2007 05:49:21 -0700
1180529361.693321.53...@x35g2000prf.googlegroups.com>:





On May 29, 11:31 pm, The Ghost In The Machine
e...@sirius.tg00suus7038.net> wrote:

In sci.physics, Radium
gluceg...@gmail.com
wrote
on 29 May 2007 21:50:16 -0700
1180500616.639919.174...@r19g2000prf.googlegroups.com>:

On May 29, 7:46 pm, "Tomoko Kanazawa"
T.Kanaz...@eodomo.gsfc.nasa.gov> wrote:

Radios dont work in space. It's a VACKYOOM.

Yes they do. Sound cannot travel through space, however,
electromagnetic representations of audio signals can. The spaceship
has air in it [duh!, otherwise those onboard wouldn't survive] so
loudspeakers attached to the radio and amplifiers should give out some
sound. Right?

Well, congrats on knowing the basics, though you forgot three additional
possibilities.

Thanks.

[1] The electromagnetic waves could be converted to light pulses, which
would then feed a video receiver.

In which case, I wonder what would be seen on the screen.

Slow-scan TV is routinely used in space missions. I'd have
to look but it's probably 5-10 minutes a picture.

A standard 60 fps NTSC picture uses almost 6 MHz of bandwidth,

1.06016 * 10^-27 J / 10^-10000 = 1.06016 * 10^9973 s
= about 1 in every 3.3595 * 10^9965 years. He's off, but
not by a lot.

On May 30, 5:49 am, Radium <gluceg...@gmail.com> wrote:

Calculate the bandwidth of that signal.