Posts by SciManStev

1) Message boards : SETI@home Science : Is it even possible to receive EM radiation from a planet orbiting a star light years away? (Message 1833380)
Posted 3 days ago by Profile SciManStev
So you are saying the the RF noise from the vacuum affects the IF? The IF has already been amplified. I cant imagine that happening to cable TV, also an amplified signal.

Yes. The noise from the vacuum is much close to what is in the IF of the TV. If I remember correctly the interference existed on both VHF, and UHF. Those signals are way to high to be interfered with by what a vacuum puts out.

Steve
2) Message boards : SETI@home Science : Is it even possible to receive EM radiation from a planet orbiting a star light years away? (Message 1833359)
Posted 3 days ago by Profile SciManStev
I suspect that searching for ET signals from near a star may well be a waste of time.

Constructive/destructive radiation is only a factor if the frequencies are identical. Unless they are synchronized this basically never happens. We are talking about noise here. Maybe some of you remember the '70s vacuum cleaners that made your TV turn to snow every time they were turned on. Same idea.

Forget Voyager, how about the Mars rovers. I suspect that JPL takes a vacation two days a year when the Earth passes in front and behind the Sun. In any event communication would be impossible on those days. Predictable losses of signal are trivial things. Think of spacecraft passing behind the Moon.

I had to think about your vacuum example. As a former TV repairman, the distortion you see when turning on a vacuum cleaner is not affecting the signal itself, only the decoder (TV) The components in older TV's were susceptible to the RF generated by the vacuum motor, but the signal itself was unaffected. It today's worlds, that would be difficult to demonstrate, as the antenna did help (much of the RF came in through the cabinet) to transmit the RF from the vacuum into the electronics, but the channel decoder should have removed the signal, but it was also re-introduced with the rest of the electronics.

Steve
3) Message boards : SETI@home Science : Is it even possible to receive EM radiation from a planet orbiting a star light years away? (Message 1833057)
Posted 5 days ago by Profile SciManStev
Bob's right. Think of constructive and destructive radiation. In order for the sun to cancel out a radio signal, it would have to be broadcasting at exactly the same frequency, but 180° out of phase. Yes, the suns radio emissions would be stronger than the earths, but the earths would not be cancelled out. In Seti, we are looking for signals that have frequencies most like that of hydrogen, which carry long distances through interstellar space. Even if we matched the suns frequency, the sun would not cancel out any modulation. Although the frequencies we listen to have greatly expanded since we first started looking, we are still looking at the frequencies most able to travel through space. We are thinking of what we would look for, if it was our intention to broadcast out from the earth. I think we have only sent signals out twice, and they were frequencies that would achieve distance.

Steve

Edit: Of course the radio signals we constantly transmit, are not near the suns frequency, but will still dissapate around the 100 light year distance.
4) Message boards : SETI@home Science : Is it even possible to receive EM radiation from a planet orbiting a star light years away? (Message 1833051)
Posted 5 days ago by Profile SciManStev
Yes, you are wrong. What is important is distance, and strength of signal. The signals we broadcast, not only have reached about a 100 light year distance, but beyond that fall into the background. If what you say is true, then the voyager would not have been able to hear the last commands we sent it. I believe the last command was this year, and it is in interstellar space.

Steve
5) Message boards : SETI@home Science : Is it even possible to receive EM radiation from a planet orbiting a star light years away? (Message 1833045)
Posted 5 days ago by Profile SciManStev
Seti is just a search. We may detect something in a day, a week, a century, or a thousand centuries. Or we may never detect anything. To not search is to never try to discover what may be there. With Arecibo, there is a 3° band that we can see as the earth rotates, and goes around the sun. We are not selecting the data, but analyzing the data other scientists have taken. With the Green Bank data, we are actually targeting exo-planets. The chances of detection are still very small, but much greater than the random data we get from Arecibo. We would all love to actually discover an intelligent signal, and it would change things on this planet forever. We are a part of that search. At least we have identified places where signals are not found, whether they were sent or not. The earth would be easy to detect within the 100 light year distance, as we do broadcast 24/7. An alien species, even with technology, may or may not do the same thing. With some 40 trillion galaxies, each with hundreds of billions of stars, most of which have maybe a dozen planets, the chances of us being the only intelligent life are incredibly small. The problem is to detect and identify another civilization.

Steve
6) Message boards : SETI@home Science : Is it even possible to receive EM radiation from a planet orbiting a star light years away? (Message 1833036)
Posted 5 days ago by Profile SciManStev
The problem with detecting a laser, is that it is a targeted signal. Unless an alien species first knew we were here, (100 light year distance our own radio waves have traveled to be discovered.) there would never be a reason to point a laser at us. Depending on a bunch of math, I'm not sure that if they pointed it at mars that we could detect it. (It depends on how distant the star was, and how much the beam spread out.) It is far easier to detect a omni-directional signal, than the minute chance of a directed signal. After all, no civilization outside of 100 light years would have any idea there was intelligent life here. They can do what we do, and detect a planet in the Goldilocks zone, but that's it.

Steve

Edit: A laser is also a short duration signal. The radio broadcast we are doing are constant, and easier to detect. We may get laser pulses for a few minutes, and unless we were looking directly at them when they hit us, we would never know.
7) Message boards : SETI@home Science : Is it even possible to receive EM radiation from a planet orbiting a star light years away? (Message 1833000)
Posted 6 days ago by Profile SciManStev
Seti is not looking strictly for intentional communication, but errant signals that were basic communication. The signals radio/TV that are emitted from earth have a range of about 100 light years before the dissipate into the noise background. Since our signals have been traveling about 100 years, stars 100 light years away may just be getting our signals. likewise, stars 50 light years out could have received signals 50 years ago, and either attempted a reply, or jumped in their ship at light speed, and would just be reaching us. Now even that would be a 100 year round trip for an alien species, even if they just stayed a day or two before returning. Our sun is a G Type star, and there are only 63 G Type stars within a 100 light year radius.

the Astropulse signals we are trying to detect should have a range of 50,000 light years, but that data, as well as multibeam came from Arecibo. The new green bank data is actually targeted from newly discovered planetary systems. For an alien to detect a signal from earth, would be easy within 100 light years. We broadcast continuously. With us detecting an alien signal might me more difficult, depending on if they allowed continuous transmissions, or just directed transmissions. Finding a needle in a haystack would be easy compared to this search.

Steve
8) Message boards : Cafe SETI : Where's my green star? (Message 1832998)
Posted 6 days ago by Profile SciManStev
I donated back in August. I have a receipt, but was never given credit for it, or a star. I can't afford to donate now, but I do see a star on one person who had trouble at the same time I did.

Steve
9) Message boards : Number crunching : Panic Mode On (103) Server Problems? (Message 1832443)
Posted 8 days ago by Profile SciManStev
It's a blank page for me here.

Steve
10) Message boards : Number crunching : Panic Mode On (103) Server Problems? (Message 1832432)
Posted 8 days ago by Profile SciManStev
Well, the new look works OK on my computer, but is virtually unusable with my phone due to the huge scrolling times.

Steve

Edit: It's a little better, as I switched the posts per page from 1000 to 100.
11) Message boards : Cafe SETI : Thanksgiving Prep!!! (Message 1832196)
Posted 9 days ago by Profile SciManStev
Our turkey is cooked, and it is as good as last year. We won't eat for several hours, but the hard part is done. With just two of us, we don't have to prepare anything. Just cook it when we are ready. We do have a nice store bought apple pie!

Steve
12) Message boards : Cafe SETI : Happy Thanksgiving!!! (Message 1832194)
Posted 9 days ago by Profile SciManStev
Happy Thanksgiving! Our turkey is cooked, as it might rain later, and it is all cut up and ready to eat. It tastes excellent, and now that it is cooked, we can have our meal tonight. For just my wife and I, the rest can be prepared in minutes. I love easy!

Steve
13) Message boards : Cafe SETI : Thanksgiving Prep!!! (Message 1831785)
Posted 12 days ago by Profile SciManStev
I only cook for my wife and I, so if I screw up, it's no big deal. For those who may wish to try grilling a turkey, here is how to do it.

Take a rectangular baking pan maybe 2 inches deep. Put it in the grill directly under where the turkey will go. You may have to remove an upper grill rack if it will be in the way. Load up the charcoal all around the baking pan. Pile it high, but not so that it falls back into the pan. Light the charcoal, and let it get going. Put the turkey on a grill rack just over the baking pan, so it catches the juices. Put down the grill cover, and wait for the little pop-up to release.

The flavor is out of this world, and the turkey will be a smoked brown color when done.



Steve
14) Message boards : Cafe SETI : Weather Forecasts IX Not Another Ice Age Please (Message 1831775)
Posted 12 days ago by Profile SciManStev
In New Hampshire, studded snow tires are legal year round. In some states, you can only use them in certain months. They make a slippery drive much safer.

Steve
15) Message boards : Cafe SETI : Thanksgiving Prep!!! (Message 1831770)
Posted 12 days ago by Profile SciManStev
If they have a fresh turkey Wednesday when I go shopping, we will get it, and grill it. Last year I charcoal grilled the turkey, and it was the best turkey I ever ate. If they don't have any fresh ones left, then I'll just have to suffer and go for steak! Yummy!

Steve
16) Message boards : Cafe SETI : Weather Forecasts IX Not Another Ice Age Please (Message 1831756)
Posted 12 days ago by Profile SciManStev
We had our first snow last night, of a whopping 1.5 to 2 inches. The roads were icy, and several cars either went off the road or rolled over. I love my studded snow tires and 4 wheel drive!

Steve
17) Message boards : Cafe SETI : OH, Hei there. (Message 1831325)
Posted 15 days ago by Profile SciManStev
I broke a rib last night.
Ouch.

Tripped over Purrball.
The silly kitty just wants to be so near me all of the time.
And sometimes does not step out of the way because she has just come to trust me so much.

I crashed hard, she was OK, but I went down very hard.

I laid there for an hour or more........Purrball of course, was licking my face.

I am OK now.

I love my kitties sooooooooooooooooooooo much.

Meow.

I hope you are OK Mark. I once broke a rib sparring in martial arts. I still won, but it hurt like a SOB. The next class, I applied a heavy roll of sprain cloth.

Steve
18) Message boards : Politics : Donald Trump for President? (Message 1830638)
Posted 19 days ago by Profile SciManStev
Then I would say we are not getting our money's worth.
Toward the end of September, 8 people came to our company to describe the different insurance plans. All of them were drawing salaries before the doctors received a penny. That just doesn't seem effecient to me.

Steve
19) Message boards : Politics : Donald Trump for President? (Message 1830624)
Posted 19 days ago by Profile SciManStev
Actually, manufacturing jobs increased by 17% since 2008. Automation has helped keep wages low. For me, health care nearly bankrupted me, and some of my friends, who owe over a million dollars. With a single payer health care system, I would pay less than half in taxes that I currently pay in health insurance. That would give me a lot of upward mobility. The US pays I think 2/3 more than any other country, but is rated 27th, and 29th in education. France has the best health care. I have no political affiliation, but as an engineer, I look to the solution that works best, with using the least amount of code (money).

Steve
20) Message boards : Politics : Donald Trump for President? (Message 1830606)
Posted 19 days ago by Profile SciManStev

Would those folks wish to give up Medicaid, Medicare, Social Security, and Defense completely?

Steve


I'll give up my favorite government program if you'll give up yours.
Then we can create a more fair tax system to pay for just what we really need.
With more money in our pockets I bet more people would be able to fund more chartities and save more and even be more able to help themselves.
Sound Good?

What is it that we really need?

Steve


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SETI@home and Astropulse are funded by grants from the National Science Foundation, NASA, and donations from SETI@home volunteers. AstroPulse is funded in part by the NSF through grant AST-0307956.