How far into space can Earths radio signals be detected?. Has any one checked from the Moon ?
QUOTE (Disley+Dec 24 2007, 05:20 PM)
How far into space can Earths radio signals be detected?. Has any one checked from the Moon ?
Wow. Just wow. Without intending to bash you for this question I have to ask. Did you think about this at all before asking it?
If you had then perhaps you would have considered any number of the myriad of spacecraft that we have sent out all over the solar system (Pioneer series, Voyager 1 and 2, Mariner series, Venera series, Viking 1 and 2, Pathfinder, Odyssey, MER 1 and 2, Mars Reconnaissance Orbiter, Gallileo, Cassini, Giotto, Helios, SOHO, Stardust, Deep Impact, NEAR ... <---- a very very incomplete list by the way) all of which constantly communicate back to us via radios (and 4 which have left the solar system)?
Did you not realize that virtually all of humanity watched Neil Armstrong walk on the moon on July 20th, 1969 on TV; and that those moving pictures and voices came to us via "radio" transmission?
Have you never seen the movie Contact in which earth-bound scientists listen to radio signals from all over the galaxy and universe?
Radio signals will propagate as far as the power with which they are transmitted will allow them to go (space is an excellent transmission medium being that it is mostly empty). So ... yes; some distant civilization will at some point probably be able to watch "American Idol" if they have a decent receiver. I know you didn't ask that but I'm guessing you were wondering it. And may god bless us all if they ever actually do see that crap.
Wow. Just wow. Without intending to bash you for this question I have to ask. Did you think about this at all before asking it?
If you had then perhaps you would have considered any number of the myriad of spacecraft that we have sent out all over the solar system (Pioneer series, Voyager 1 and 2, Mariner series, Venera series, Viking 1 and 2, Pathfinder, Odyssey, MER 1 and 2, Mars Reconnaissance Orbiter, Gallileo, Cassini, Giotto, Helios, SOHO, Stardust, Deep Impact, NEAR ... <---- a very very incomplete list by the way) all of which constantly communicate back to us via radios (and 4 which have left the solar system)?
Did you not realize that virtually all of humanity watched Neil Armstrong walk on the moon on July 20th, 1969 on TV; and that those moving pictures and voices came to us via "radio" transmission?
Have you never seen the movie Contact in which earth-bound scientists listen to radio signals from all over the galaxy and universe?
Radio signals will propagate as far as the power with which they are transmitted will allow them to go (space is an excellent transmission medium being that it is mostly empty). So ... yes; some distant civilization will at some point probably be able to watch "American Idol" if they have a decent receiver. I know you didn't ask that but I'm guessing you were wondering it. And may god bless us all if they ever actually do see that crap.
The signal must be sent
1. with a phased locked loop
2. requires error correction code.
Deep space ransmitters have to be something like 100 watts because of weight restrictions. A transmitter with the power of a light bulb sends images and data from the edge of the universe. I think this would be relevent for those who are convinced that there is "something out there." A dumb question is better than blind acceptance.
1. with a phased locked loop
2. requires error correction code.
Deep space ransmitters have to be something like 100 watts because of weight restrictions. A transmitter with the power of a light bulb sends images and data from the edge of the universe. I think this would be relevent for those who are convinced that there is "something out there." A dumb question is better than blind acceptance.
QUOTE (Disley+Dec 24 2007, 05:20 PM)
How far into space can Earths radio signals be detected?. Has any one checked from the Moon ?
Where has this idiots brain gone, has any one checked on the Moon ?
Where has this idiots brain gone, has any one checked on the Moon ?
For deep space applications a phase locked loop is required.
http://www.circuitsage.com/pll.html
Here is the Mission statment of the site.
If you need specific help on a scientific problem or have a question related to physics or technology, visit the PhysOrg Forums. Here you’ll find experts from various fields online every day
Here is the question
How far into space can Earths radio signals be detected?. Has any one checked from the Moon ?
Here is one answer: An FM station has a bandwidth of nearly 200k hz while the PLL has a bandwidth of a few hertz. Noise is in some proportion to bandwidth. I would think that the noise from the ionisphere would drown out the signal if an ordinary reciever was used to listen to earth commercial stations on the moon.
http://www.circuitsage.com/pll.html
Here is the Mission statment of the site.
If you need specific help on a scientific problem or have a question related to physics or technology, visit the PhysOrg Forums. Here you’ll find experts from various fields online every day
Here is the question
How far into space can Earths radio signals be detected?. Has any one checked from the Moon ?
Here is one answer: An FM station has a bandwidth of nearly 200k hz while the PLL has a bandwidth of a few hertz. Noise is in some proportion to bandwidth. I would think that the noise from the ionisphere would drown out the signal if an ordinary reciever was used to listen to earth commercial stations on the moon.
QUOTE (Woulf+Dec 30 2007, 01:46 PM)
For deep space applications a phase locked loop is required.
http://www.circuitsage.com/pll.html
Here is the Mission statment of the site.
If you need specific help on a scientific problem or have a question related to physics or technology, visit the PhysOrg Forums. Here you’ll find experts from various fields online every day
Here is the question
How far into space can Earths radio signals be detected?. Has any one checked from the Moon ?
Here is one answer: An FM station has a bandwidth of nearly 200k hz while the PLL has a bandwidth of a few hertz. Noise is in some proportion to bandwidth. I would think that the noise from the ionisphere would drown out the signal if an ordinary reciever was used to listen to earth commercial stations on the moon.
I guess I didn't see the part where he asked about FM signals. My bad. I thought the question was ...
How far into space can Earth's radio signal be detected? Has any one checked from the Moon?
I guess I was paying too much attention back in basic electronics when the defined the Radio Spectrum. I always thought AM, FM, UHF, VHF, TV, Microwave were "bands" in the spectrum. From now on I'll have to assume "FM" when anyone asks a question about "Radio"?
Perhaps the question should have been ....
Could I listen to 101.3FM next time I visit the Lunar Hilton?
If he had then I wouldn't have bothered to answer because frankly I wouldn't have known for sure. But of course that wasn't the question. And gee if I'd known that website sent him here then I wouldn't have bothered to answer since I'm not an "expert". See ... I thought the question was ...
How far into space can Earth's radio signals be detected? Has any one checked from the Moon?
and not ...
Hey ... Circuits Age dot com sent me here to find an expert on radio transmission and I just would like to know if Jethro Tull was playing on 650AM (assuming they're transmitting at 100,000 Watts) if I'd be able to get that on my transistor radio if I were standing on top of a mountain on the moon?
Getting the difference now between a specific question directed at experts and a generally poorly formed question that had no forethought? That's why I answered and why I answered the way I did. But thanks for coming in and figuring out that it really was a question about FM Radio.
http://www.circuitsage.com/pll.html
Here is the Mission statment of the site.
If you need specific help on a scientific problem or have a question related to physics or technology, visit the PhysOrg Forums. Here you’ll find experts from various fields online every day
Here is the question
How far into space can Earths radio signals be detected?. Has any one checked from the Moon ?
Here is one answer: An FM station has a bandwidth of nearly 200k hz while the PLL has a bandwidth of a few hertz. Noise is in some proportion to bandwidth. I would think that the noise from the ionisphere would drown out the signal if an ordinary reciever was used to listen to earth commercial stations on the moon.
I guess I didn't see the part where he asked about FM signals. My bad. I thought the question was ...
How far into space can Earth's radio signal be detected? Has any one checked from the Moon?
I guess I was paying too much attention back in basic electronics when the defined the Radio Spectrum. I always thought AM, FM, UHF, VHF, TV, Microwave were "bands" in the spectrum. From now on I'll have to assume "FM" when anyone asks a question about "Radio"?
Perhaps the question should have been ....
Could I listen to 101.3FM next time I visit the Lunar Hilton?
If he had then I wouldn't have bothered to answer because frankly I wouldn't have known for sure. But of course that wasn't the question. And gee if I'd known that website sent him here then I wouldn't have bothered to answer since I'm not an "expert". See ... I thought the question was ...
How far into space can Earth's radio signals be detected? Has any one checked from the Moon?
and not ...
Hey ... Circuits Age dot com sent me here to find an expert on radio transmission and I just would like to know if Jethro Tull was playing on 650AM (assuming they're transmitting at 100,000 Watts) if I'd be able to get that on my transistor radio if I were standing on top of a mountain on the moon?
Getting the difference now between a specific question directed at experts and a generally poorly formed question that had no forethought? That's why I answered and why I answered the way I did. But thanks for coming in and figuring out that it really was a question about FM Radio.
QUOTE (Princess Bluebell+Dec 29 2007, 03:05 PM)
Where has this idiots brain gone, has any one checked on the Moon ?
Oh my, I forgot to laugh! Okay Princess..time to remove the tiara! It's weighing down your brain, you have one too, right? Or it must be floating around somewhere in space. Get off the laughing ***...and maybe you can learn something daily on a serious level. It's better to ask uncertain questions even though may sound absurd but, at least they learn and are able to take another step forward. You're such a *****.
Oh my, I forgot to laugh! Okay Princess..time to remove the tiara! It's weighing down your brain, you have one too, right? Or it must be floating around somewhere in space. Get off the laughing ***...and maybe you can learn something daily on a serious level. It's better to ask uncertain questions even though may sound absurd but, at least they learn and are able to take another step forward. You're such a *****.
QUOTE (uaafanblog+Dec 31 2007, 08:45 AM)
I guess I didn't see the part where he asked about FM signals. My bad. I thought the question was ...
How far into space can Earth's radio signal be detected? Has any one checked from the Moon?
I guess I was paying too much attention back in basic electronics when the defined the Radio Spectrum. I always thought AM, FM, UHF, VHF, TV, Microwave were "bands" in the spectrum. From now on I'll have to assume "FM" when anyone asks a question about "Radio"?
Perhaps the question should have been ....
Could I listen to 101.3FM next time I visit the Lunar Hilton?
If he had then I wouldn't have bothered to answer because frankly I wouldn't have known for sure. But of course that wasn't the question. And gee if I'd known that website sent him here then I wouldn't have bothered to answer since I'm not an "expert". See ... I thought the question was ...
How far into space can Earth's radio signals be detected? Has any one checked from the Moon?
and not ...
Hey ... Circuits Age dot com sent me here to find an expert on radio transmission and I just would like to know if Jethro Tull was playing on 650AM (assuming they're transmitting at 100,000 Watts) if I'd be able to get that on my transistor radio if I were standing on top of a mountain on the moon?
Getting the difference now between a specific question directed at experts and a generally poorly formed question that had no forethought? That's why I answered and why I answered the way I did. But thanks for coming in and figuring out that it really was a question about FM Radio.
I can certainly understand your point of view. I perceived the question as yourself has. If i had to dissect his question then, it would pretty much come to fruition of Woulf's logic. Either way, your answers and Woulf's are worthy.
How far into space can Earth's radio signal be detected? Has any one checked from the Moon?
I guess I was paying too much attention back in basic electronics when the defined the Radio Spectrum. I always thought AM, FM, UHF, VHF, TV, Microwave were "bands" in the spectrum. From now on I'll have to assume "FM" when anyone asks a question about "Radio"?
Perhaps the question should have been ....
Could I listen to 101.3FM next time I visit the Lunar Hilton?
If he had then I wouldn't have bothered to answer because frankly I wouldn't have known for sure. But of course that wasn't the question. And gee if I'd known that website sent him here then I wouldn't have bothered to answer since I'm not an "expert". See ... I thought the question was ...
How far into space can Earth's radio signals be detected? Has any one checked from the Moon?
and not ...
Hey ... Circuits Age dot com sent me here to find an expert on radio transmission and I just would like to know if Jethro Tull was playing on 650AM (assuming they're transmitting at 100,000 Watts) if I'd be able to get that on my transistor radio if I were standing on top of a mountain on the moon?
Getting the difference now between a specific question directed at experts and a generally poorly formed question that had no forethought? That's why I answered and why I answered the way I did. But thanks for coming in and figuring out that it really was a question about FM Radio.
I can certainly understand your point of view. I perceived the question as yourself has. If i had to dissect his question then, it would pretty much come to fruition of Woulf's logic. Either way, your answers and Woulf's are worthy.
I did a search of uaabloog, looks more like b.s. bloog. Also, looked at Jane's Space Technology but couldn't find Phased Locked Loop. Seems that info is either too shallow or too technical.
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