| Author |
Message |
    
Skilletlicker
| | Posted on Monday, February 16, 2004 - 9:39 am: | 
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could any one tell me the seed of a radio wave thru space, say channel 4 ,27.005
skilletlicker |
Karatebutcher
| | Posted on Monday, February 16, 2004 - 10:44 am: |
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Is it the speed of light ????? |
Ozzie
| | Posted on Monday, February 16, 2004 - 12:02 pm: |
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around 186,000 mile per second - I think.. |
Tech181
| | Posted on Monday, February 16, 2004 - 12:12 pm: |
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186,000 miles per second, the speed of light. |
Skilletlicker
| | Posted on Monday, February 16, 2004 - 12:23 pm: |
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i waS TALking to a fellow cber and he mentioned how quick the radio waves travelled when talking to some one in australla,it must be some where near the speed of light i believe that at 27.005
that the radio wave is going up and down the antenna 27 million times a second,that is fast
skilletlicker |
Forummaster
| | Posted on Monday, February 16, 2004 - 12:33 pm: |
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The velocity (or speed) of a radio wave radiated into free space by a transmitting antenna is equal to the speed of light - 186,000 miles per second or 300,000,000 meters per second. Because of various factors, such as barometric pressure, humidity, molecular content, etc., radio waves travel inside the Earth's atmosphere at a speed slightly less than the speed of light. |
Skilletlicker
| | Posted on Monday, February 16, 2004 - 12:42 pm: |
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thanks to all of you for your input:i broke it down to miles and figured it would travel 3000 miles in .06 of a second |
ELCO Guy
| | Posted on Monday, February 16, 2004 - 5:41 pm: |
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Actually it would be slightly LONGER than that. You see the speed of light as stated above is as stated in a vacume of perfect space. The air or Water or wire or any other medium thru which electric or radiation travels slows it down a bit.
For example a quarter wave length for any given frequency in Mhz is 984 divided by said frequency in Mhz. A Quarter wave length in free space would be 246 divided by the frequency in Mhz. BUT to make a quarter wave dipole using copper wire the formulae is 234 divided by the frequency in Mhz. The top number is lower because in practical use antennas using copper wire need to be shortened by a few percent in order to imitate free space. The copper, this example, acts to slow down the speed just a tad bit.
In the Atmosphere the speed reduction may not be as much as copper wire. But you have to factor in as well that the signal has to bounce in the radio atmosphere which increases the actual distance of the signal travel. A signal that must bounce up and down 4 times to get to the destination takes a much longer signal path compared to a line of sight propagation. Humidity, solar flares, magnetic storms and geo magnetic disturbances also effect a transmitted signal. So that .06 (without figuring) hmmm would probably be .08 or .09 just off the top of my noggin. And if you get a bad solar storm it just might not get there at all.
Signed
That ELCO Guy |
Tech181
| | Posted on Monday, February 16, 2004 - 8:31 pm: |
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Hmmm, your math is a bit off. Your radio wave would have travelled 11,160 miles in .06 of a second. It will travel 3000 miles in just 0.016 of a second. But hey, at this speed, who cares, (unless you're timing a simul-cast system)! |
Bruce
| | Posted on Monday, February 16, 2004 - 9:23 pm: |
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hummmmmmm WARP SPEED SCOTIE! |
Lowpowerhal
| | Posted on Monday, February 16, 2004 - 9:34 pm: |
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I have a ? Let just say you can beat the speed of light, What will happen if you can go past it and get there before it gets to you ? Can you stop the signal? If you could this is called time travel. All we need to do now is have a time machine.I wonder sometimes, They can speed up atoms to the point of danger and push the point of no return.Should we go there? |
Tech181
| | Posted on Monday, February 16, 2004 - 11:01 pm: |
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Your headlights would be useless, that's for sure! |
Skilletlicker
| | Posted on Tuesday, February 17, 2004 - 6:31 am: |
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well: my rethmetic might be just a mite fuzzy
as i didn,t get out of the second grade,pap made me quit when they put me in the second grade,he was jealous because he was still in the first |
Bruce
| | Posted on Tuesday, February 17, 2004 - 7:20 am: |
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hummmmm dosn't mass increase to inf at light speed? |
Ozzie
| | Posted on Tuesday, February 17, 2004 - 9:11 am: |
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Tech181
No they wouldn't -they'd let you see where you been (Grin)..
MMM. Thought if it were possible to go fatsre than light it would make DXing easier. Put out a call for that rare DX location then travel to the other end and answer the call you just made. Repeat the steps and viola DX worked with you both ends of the contact. Might have to revamp DXCC rules.. |
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