Science > Physics > Re: Receiving 2 GHz AM signals in space. What do they sound like?
| Topic: |
Science > Physics |
| User: |
"Green Xenon [Radium]" |
| Date: |
06 Oct 2007 05:17:55 PM |
| Object: |
Re: Receiving 2 GHz AM signals in space. What do they sound like? |
On Oct 6, 6:24 am, "George Dishman" <geo...@briar.demon.co.uk> wrote in
http://groups.google.com/group/sci.energy/msg/ad14e4c2d56369db :
"Green Xenon [Radium]" <gluceg...@excite.com> wrote in
messagenews:47072242$0$15384$4c368faf@roadrunner.com...
...
... This receiver also has a robust signal processor
that can eliminate clipped-waveforms [such as square waves], spikes,
clicks, pops, hiss, and random noise
even at those trivial wattage
levels. After eliminating those unwanted signals, the carrier wave
is
amplified.
There is no carrier,
Yes there is. Why do you say there isn't? Certain waveforms in the
carrier wave that would cause the modulator signal to contain
clipped-waveforms [such as square waves], spikes, clicks, pops, hiss,
and random noise are removed. However, the remainder of the carrier-wave
remains unscathed.
it was one of those signals you just
eliminated.
How so?
If I am on this spaceship, what will
I most likely hear on the radio?
Stop trying to troll, you are too stupid to pull it off.
I don't troll or spam. I am asking this question because -- unlikely [if
not impossible] as my 2-GHz-in-outer-space scenario is -- I am still
interested in it.
Now please please please answer my question. What would I hear?
I chose 2 GHz because it is in the UHF band. UHFs tend to be best for
extremely long distance reception. Of the radio waves emitted by objects
trillions of miles -- or more -- away, UHF is usually the most receivable.
.
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| User: "George Dishman" |
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| Title: Re: Receiving 2 GHz AM signals in space. What do they sound like? |
07 Oct 2007 06:43:26 AM |
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"Green Xenon [Radium]" <glucegen1@excite.com> wrote in message
news:47080705$0$24349$4c368faf@roadrunner.com...
On Oct 6, 6:24 am, "George Dishman" <geo...@briar.demon.co.uk> wrote in
http://groups.google.com/group/sci.energy/msg/ad14e4c2d56369db :
"Green Xenon [Radium]" <gluceg...@excite.com> wrote in
messagenews:47072242$0$15384$4c368faf@roadrunner.com...
...
... This receiver also has a robust signal processor
that can eliminate clipped-waveforms [such as square waves], spikes,
clicks, pops, hiss, and random noise
even at those trivial wattage
levels. After eliminating those unwanted signals, the carrier wave
is
amplified.
There is no carrier,
Yes there is. Why do you say there isn't?
Because a sine wave is a sine and you cannot
distiguish one from another. There is no
criterion that says anything is a "carrier"
and not just part of the background hiss.
it was one of those signals you just
eliminated.
How so?
If you use a band pass filter at some frequency
that you guess could be a carrier followed by an
envelope detector, you get hiss. To eliminate
the hiss, you have to eliminate all other
frequencies so all you are left with is CW and
the envelope detector then gives a DC output.
If I am on this spaceship, what will
I most likely hear on the radio?
Stop trying to troll, you are too stupid to pull it off.
I don't troll or spam. I am asking this question because -- unlikely [if
not impossible] as my 2-GHz-in-outer-space scenario is -- I am still
interested in it.
Now please please please answer my question. What would I hear?
Several people have answered you already, the
answer is silence.
George
p.s this time I won't forget to do the <plonk> :(
Don't expect any more replies, I don't respond to
spammers and your drivel is off-topic in virtually
every group you have posted to.
.
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| User: "Green Xenon [Radium]" |
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| Title: Re: Receiving 2 GHz AM signals in space. What do they sound like? |
07 Oct 2007 06:41:09 PM |
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George Dishman wrote:
"Green Xenon [Radium]" <glucegen1@excite.com> wrote in message
news:47080705$0$24349$4c368faf@roadrunner.com...
On Oct 6, 6:24 am, "George Dishman" <geo...@briar.demon.co.uk> wrote in
http://groups.google.com/group/sci.energy/msg/ad14e4c2d56369db :
"Green Xenon [Radium]" <gluceg...@excite.com> wrote in
messagenews:47072242$0$15384$4c368faf@roadrunner.com...
...
... This receiver also has a robust signal processor
that can eliminate clipped-waveforms [such as square waves], spikes,
clicks, pops, hiss, and random noise
even at those trivial wattage
levels. After eliminating those unwanted signals, the carrier wave
is
amplified.
There is no carrier,
Yes there is. Why do you say there isn't?
Because a sine wave is a sine and you cannot
distiguish one from another. There is no
criterion that says anything is a "carrier"
and not just part of the background hiss.
Okay. Sorry. "Carrier" is the wrong word. The radio reciever captures
and demodulated 2 GHz waves as if those waves are amplitude-modulated.
So this "carrier" is really the waves emitted from cosmic sources.
it was one of those signals you just
eliminated.
How so?
If you use a band pass filter at some frequency
that you guess could be a carrier followed by an
envelope detector, you get hiss. To eliminate
the hiss, you have to eliminate all other
frequencies so all you are left with is CW and
the envelope detector then gives a DC output.
Okay.
If I am on this spaceship, what will
I most likely hear on the radio?
Stop trying to troll, you are too stupid to pull it off.
I don't troll or spam. I am asking this question because -- unlikely [if
not impossible] as my 2-GHz-in-outer-space scenario is -- I am still
interested in it.
Now please please please answer my question. What would I hear?
Several people have answered you already, the
answer is silence.
Wouldn't I hear sounds resulting from demodulating the 2 GHz waves in an
AM-manner?
.
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| User: "Green Xenon [Radium]" |
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| Title: Re: Receiving 2 GHz AM signals in space. What do they sound like? |
10 Oct 2007 01:23:40 PM |
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K7ITM wrote in
http://groups.google.com/group/rec.radio.amateur.space/msg/29d5341be8ff65fe
:
Why do you say that "UHFs tend to the best for extremely long distance
reception"? Have a look at the basic equation governing line-of-sight
reception.
Lower frequencies are absorbed by charged particles. Ionized zones [such
as Earth ionosphere and the heliosphere around the solar system] tend to
block low-frequency radio waves. That is why UHF is the best.
UHFs are the “sweet-spot” of radio waves. They are high-frequency-enough
not to be attenuated by objects that block longer-wave radio signals yet
low-frequency-enough not to be attenuated by objects that block infrared
rays, SHFs, or EHFs.
Why do you not answer your own question? It sounds to me like as
reasonable a premise for a science fiction book as many that have been
successful. You could perhaps spin it into quite an interesting
story. You've already started with a premise that's so far from -- so
very, very far from -- the current realities or even the dreams of
people designing receivers that you may as well suppose you're going
to receive whatever your wildest imagination might come up with.
Since there is a nearly countless number of stars in the known
universe, and since a large percentage of them could be planetary
systems, each with the possibility of emitting interesting amplitude
modulated carriers, your choices are pretty near limitless. Wow! Let
your imagination run wild. It obviously did when you posed the
question; you may as well let it run as wild with the answer. Back to
you, Nonex!
Okay, I will let my imagination run wild.
I would hear scary stuff on the space station’s radio.
I used to often play my Nintendo when it was connected to channel 3.
However, I was change the TV channel to 4. I could see the video of the
game but it was fuzzy and covered in grains. The music of the game was
absent, and instead was filled with frightening-yet-enjoyable tones
[sounding like a buzzer, lawn mower, or electric shaver] along with a
faint audio of what was being discussed on the channel 4 news.
I would hear something similar on my 2 GHz AM DX receiver in space.
Also, whenever there is drill or an actually emergency, the Emergency
Alert System [EAS] plays their music. First they play the boring
low-pitch square-wave tones. Then they play the high-pitched,
terrifying, enjoyable, psychedelic sine-wave tones.
I would also hear something similar to the second higher-pitched set of
EAS tones on my 2 GHz AM DX receiver in space but not the 1st lower
pitched tones. The lower-pitched 1st tones don’t at all resemble what I
would hear on the AM receiver.
In addition, I would hear sounds that are similar to the following
terrifying-yet-enjoyable tones present on this keyboard’s 100 sound tone
back:
http://concertmate.evenement0.net/img/concertmate_realistic_concertmate-450_img1.jpg
#75 “cosmic sound” when the volume is at maximum
#76 “telephone” when the volume is at minimum and I press keys from the
7th black key [from the left] or lower. If any key that is right of the
7th black key is pressed, the sound is totally different and will not
even remotely resemble anything I would hear on the AM receiver.
#81 “marimba” when the volume is at minimum and I press the lowest or
highest key separately – especially if I first press the lowest key,
then let go, and then immediately press the highest key afterwards.
#85 “afro percussion” when the volume is at maximum and I smoothly slide
my hand from lowest to highest note and then highest to lowest note or
if I play notes two or more notes with one no higher than the 7th black
key from the left and the other note no lower than the 10th key from the
right. Actually any combinations of this tone will resemble what I would
hear on my 2 GHz receiver.
#96 “bass/piano” when the volume is at maximum and I press the lowest key.
All the sounds I hear on the receiver are those that result from the
radio waves emitted by the magnetic fields of objects in the distant
cosmos -- such as magnetars. At times, when the magnetic objects cause
magnetic vibrations at an RF-rate, they cause radio waves to be
generated. If the rates include 2-billions-vibrations-per-second, then
my receiver will demodulate the 2 GHz parts and I can hear the signals
-- provided that the demodulations result in frequencies anywhere from
20 to 20,000 Hz [the human hearing range].
Oh, and by the way, "spamming" comes, in one form, from posting too
many places; I've trimmed off a whole bunch of groups for this reply.
By my way of thinking, you're being pretty generous with yourself
saying you don't spam.
I only posted to relevant NGs.
.
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