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Science Forum Index » Physics - Electromagnetic Forum » Spcae Radio Question
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| Michael A. Terrell |
Posted: Tue May 29, 2007 1:42 am |
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Radium wrote:
Quote:
On May 28, 11:30 am, "TimPerry" <timpe...@noaspama.net> wrote:
EBS tones have been discontinued for many years now in the US.
Nope. Whenever an emergency occurs, first they play the boring low-
pitch square-wave tones. Then they play the high-pitched, terrifying,
psychedelic sine-wave tones I described. These high-frequency,
heterodyne-resembling tones are so mind-altering that they make my
eyes water. Yet I enjoy them. Things that are scary can also be
pleasurable at times. Why do you think they have roller-coasters?
"high-pitched, terrifying heterodynes" could be some types of bluegrass
What do you mean by "bluegrass"?
Lester Flatt & Earl Scruggs, dummy.
--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.
Michael A. Terrell
Central Florida |
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| Michael A. Terrell |
Posted: Tue May 29, 2007 1:44 am |
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Uncle Al wrote:
Quote:
Radium wrote:
Hi:
Let's say I am in a space station which has a supercooled 150 KHz DX
analog receiver that receives the magnetic fields [while ignoring the
electric fields] of extremely weak 150 KHz AM analog carrier signals.
In addition, this receiver is so sensitive and powerful that it can
clearly pick up AM carrier waves as weak as 10^-10,000 watt [i.e. 10-
to-the-power-NEGATIVE-10,000 watt].
[snip crap]
Radium
Fucking imbecile.
I hope not. The last thing we need is for it to breed more
imbeciles. :(
--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.
Michael A. Terrell
Central Florida |
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| TimPerry |
Posted: Tue May 29, 2007 7:17 am |
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Radium wrote:
Quote: On May 28, 11:30 am, "TimPerry" <timpe...@noaspama.net> wrote:
EBS tones have been discontinued for many years now in the US.
Nope. Whenever an emergency occurs, first they play the boring low-
pitch square-wave tones.
you are perhaps referring to the Emergency Alert System (EAS).
after all, a pleasant sounding emergency sound wouldn't be very effective.
it's not really square waves either. look up AFSK (audio frequency shift
keying)
Quote: "high-pitched, terrifying heterodynes" could be some types of
bluegrass
What do you mean by "bluegrass"?
high pitched annoying heterodynes often created by makeshift instruments
such as washboards and spoons. |
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| Radium |
Posted: Tue May 29, 2007 12:05 pm |
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On May 29, 5:17 am, "TimPerry" <timpe...@noaspama.net> wrote:
Quote: Radium wrote:
On May 28, 11:30 am, "TimPerry" <timpe...@noaspama.net> wrote:
EBS tones have been discontinued for many years now in the US.
Nope. Whenever an emergency occurs, first they play the boring low-
pitch square-wave tones.
you are perhaps referring to the Emergency Alert System (EAS).
after all, a pleasant sounding emergency sound wouldn't be very effective.
it's not really square waves either. look up AFSK (audio frequency shift
keying)
Yes. The EAS. Whenever an emergency occurs, first they play the boring
low-pitch tones. Then they play the high-pitched, terrifying sine-wave
tones I described.
BTW, I don't feel the first sound they play, to be indicative of any
emergency. That low-pitched sound simply doesn't provide the
frightening, eye-watering, psychedelic feeling the second high-pitched
sound does. The second sound puts me in a dissociative state.
You say the first sound uses AFSK. What does the second sound use? |
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| Radium |
Posted: Tue May 29, 2007 12:40 pm |
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On May 29, 5:17 am, "TimPerry" <timpe...@noaspama.net> wrote:
Quote: Radium wrote:
On May 28, 11:30 am, "TimPerry" <timpe...@noaspama.net> wrote:
EBS tones have been discontinued for many years now in the US.
Nope. Whenever an emergency occurs, first they play the boring low-
pitch square-wave tones.
you are perhaps referring to the Emergency Alert System (EAS).
after all, a pleasant sounding emergency sound wouldn't be very effective.
it's not really square waves either. look up AFSK (audio frequency shift
keying)
Yes. The EAS. Whenever an emergency occurs, first they play the boring
low-pitch tones. Then they play the high-pitched, terrifying sine-wave
tones I described.
BTW, I don't feel the first sound they play, to be indicative of any
emergency. That low-pitched sound simply doesn't provide the
frightening, eye-watering, psychedelic feeling the second high-pitched
sound does. The second sound puts me in a dissociative state.
You say the first sound uses AFSK. What does the second sound use? |
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| TimPerry |
Posted: Tue May 29, 2007 7:31 pm |
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Guest
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Quote:
EBS tones have been discontinued for many years now in the US.
Nope. Whenever an emergency occurs, first they play the boring low-
pitch square-wave tones.
you are perhaps referring to the Emergency Alert System (EAS).
after all, a pleasant sounding emergency sound wouldn't be very
effective. it's not really square waves either. look up AFSK (audio
frequency shift keying)
Yes. The EAS. Whenever an emergency occurs, first they play the boring
low-pitch tones.
think of then as duck farts... it wont seem so boring.
Quote: Then they play the high-pitched, terrifying sine-wave
tones I described.
BTW, I don't feel the first sound they play, to be indicative of any
emergency.
it might be only a test <g>
Quote: That low-pitched sound simply doesn't provide the
frightening, eye-watering, psychedelic feeling the second high-pitched
sound does. The second sound puts me in a dissociative state.
You say the first sound uses AFSK. What does the second sound use?
the 8 second 2 tone signal was manditory when the system was first
introduced. it now is optional. most do not use it, however relays from the
NWS sometimes have it. |
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| Paul Cardinale |
Posted: Tue May 29, 2007 8:44 pm |
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Guest
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Radium wrote:
Quote: Hi:
Let's say I am in a space station which has a supercooled 150 KHz DX
analog receiver that receives the magnetic fields [while ignoring the
electric fields] of extremely weak 150 KHz AM analog carrier signals.
In addition, this receiver is so sensitive and powerful that it can
clearly pick up AM carrier waves as weak as 10^-10,000 watt [i.e. 10-
to-the-power-NEGATIVE-10,000 watt].
Which means that you can expect photons to arrive at a rate of about
one every 10^9964 years. Since the universe is only about 10^10 years
old...
Paul Cardinale |
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| Tomoko Kanazawa |
Posted: Tue May 29, 2007 9:46 pm |
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Guest
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"Paul Cardinale" <pcardinale@volcanomail.com> wrote in message
news:1180489450.464865.284120@o5g2000hsb.googlegroups.com...
Quote:
Radium wrote:
Hi:
Let's say I am in a space station which has a supercooled 150 KHz DX
analog receiver that receives the magnetic fields [while ignoring the
electric fields] of extremely weak 150 KHz AM analog carrier signals.
In addition, this receiver is so sensitive and powerful that it can
clearly pick up AM carrier waves as weak as 10^-10,000 watt [i.e. 10-
to-the-power-NEGATIVE-10,000 watt].
Radios dont work in space. It's a VACKYOOM. |
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| Radium |
Posted: Tue May 29, 2007 11:50 pm |
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Guest
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On May 29, 7:46 pm, "Tomoko Kanazawa"
<T.Kanaz...@eodomo.gsfc.nasa.gov> wrote:
Quote: 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? |
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| Paul Hovnanian P.E. |
Posted: Tue May 29, 2007 11:54 pm |
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Radium wrote:
Quote: If I am on this spaceship, what will I hear on the radio?
Ths sound of one hand clapping.
--
Paul Hovnanian mailto:Paul@Hovnanian.com
------------------------------------------------------------------
c (velocity of light in a vacuum) = 1.8x10^12 furlongs per fortnight |
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| Radium |
Posted: Tue May 29, 2007 11:54 pm |
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Guest
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On May 29, 5:31 pm, "TimPerry" <timpe...@noaspama.net> wrote:
Quote: EBS tones have been discontinued for many years now in the US.
Nope. Whenever an emergency occurs, first they play the boring low-
pitch square-wave tones.
you are perhaps referring to the Emergency Alert System (EAS).
after all, a pleasant sounding emergency sound wouldn't be very
effective. it's not really square waves either. look up AFSK (audio
frequency shift keying)
Yes. The EAS. Whenever an emergency occurs, first they play the boring
low-pitch tones.
think of then as duck farts... it wont seem so boring.
Then they play the high-pitched, terrifying sine-wave
tones I described.
BTW, I don't feel the first sound they play, to be indicative of any
emergency.
it might be only a test <g
That low-pitched sound simply doesn't provide the
frightening, eye-watering, psychedelic feeling the second high-pitched
sound does. The second sound puts me in a dissociative state.
You say the first sound uses AFSK. What does the second sound use?
the 8 second 2 tone signal was manditory when the system was first
introduced. it now is optional. most do not use it, however relays from the
NWS sometimes have it.
I am in Southern California. Whenever the EAS plays its audio on the
TV/Radio stations, I notice them playing both the first and second
sounds. |
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| Dan Bloomquist |
Posted: Wed May 30, 2007 12:34 am |
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Paul Hovnanian P.E. wrote:
Quote: Radium wrote:
[snip]
If I am on this spaceship, what will I hear on the radio?
Ths sound of one hand clapping.
I'm reminded of spaceman. Have you been around long enough to remember
him? (aka James M Driscoll)
Now, he was entertaining.... |
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| The Ghost In The Machine |
Posted: Wed May 30, 2007 1:27 am |
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In sci.physics, Michael A. Terrell
<mike.terrell@earthlink.net>
wrote
on Tue, 29 May 2007 06:40:54 GMT
<465BCB0E.4B58C639@earthlink.net>:
Quote: 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 |
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| The Ghost In The Machine |
Posted: Wed May 30, 2007 1:31 am |
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Guest
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In sci.physics, Radium
<glucegen1@gmail.com>
wrote
on 29 May 2007 21:50:16 -0700
<1180500616.639919.174210@r19g2000prf.googlegroups.com>:
Quote: 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.
--
#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 |
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| Michael A. Terrell |
Posted: Wed May 30, 2007 4:37 am |
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Guest
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Tomoko Kanazawa wrote:
Quote:
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.
--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.
Michael A. Terrell
Central Florida |
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