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#61
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ml wrote:
(Richard Harrison) wrote: There are no volts or amps in the wave, only the ability to generate volts and amps in conductors. if the waves have the ability to generate it, how can their be no volts or amps in the wave? what force has it how did it get seperated from the 'volts' I think maybe what Richard is trying to say is that the wave actually consists of an E-field and an H-field. The E-field results in volts and the H-field results in amps. The charged particles responsible for the voltage and current cannot move at the speed of light. Probably a more modern way of saying the same thing is that RF waves are photonic energy, moving at the speed of light. The photons are the fields and the fields are the photons. Electrons cannot move at the speed of light. Photons generated by excited electrons are what move at the speed of light. -- 73, Cecil http://www.qsl.net/w5dxp ----== Posted via Newsfeeds.Com - Unlimited-Uncensored-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 100,000 Newsgroups ---= East/West-Coast Server Farms - Total Privacy via Encryption =--- |
#62
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ml wrote:
what would be the 'momentum' your referring to? is their a knetic/stored piece i am misssing? or are you just referring to like the flywheel effect for ex a large coil might have In 1619, Kepler proposed that it was the pressure (momentum) of sunlight that blows back a comet's tail. Maxwell, in 1873 said: "In a medium in which waves are propagated, there is a pressure (momentum) in the direction normal to the waves ..." From "Optics", by Hecht: "One of the most significant properties of the electromagnetic wave is that it transports energy and momentum." ... "Indeed, whenever we have a flow of energy, it's reasonable to expect that there will be an associated momentum - the two are the related time and space aspects of motion." And, of course, energy and momentum are two things that must necessarily be conserved. The bottom line is that if there are any reflected waves that don't reach the source (and also are not dissipated), they must necessarily have had their direction of energy and momentum reversed back toward the load. Anything else would violate the laws of physics. -- 73, Cecil http://www.qsl.net/w5dxp ----== Posted via Newsfeeds.Com - Unlimited-Uncensored-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 100,000 Newsgroups ---= East/West-Coast Server Farms - Total Privacy via Encryption =--- |
#63
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Ian White GM3SEK wrote:
The moral is "draw no conclusion that could be incorrect". Don't know about you, Ian, but I learn more when my conclusion is incorrect. I enjoy both, but I actually enjoy being proven wrong more than I enjoy being proven right. Unfortunately, sacred cows are presented on this newsgroup much more than technical information. Lord forgive my Texan nature, I dearly love to barbeque sacred cows. -- 73, Cecil http://www.qsl.net/w5dxp |
#64
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m wrote:
"If the waves have the ability to generate it, how can there be no volts or amps in the wave?' Good question. We know light, an EM phenomenon, travels to us over zillions of miles and years through a medium of sparce and scattered conduction when there is any. The answer is fields which need no conduction, yet still exert action at a distance. James Clerk-Maxwell speculated that the kind of current you have in a capacitor, displacement current, which does not require electron migration, was responsible for propagation in free space, no "aether" necessary. Maxwell was right. Two of Maxwell`s equations are called his field equations. The first equation says that a changing magnetic field produces an electric field. The second says that a changing electric field produces a magnetic field. That is the secret of electromagnetic radiation. For more details see "Radio-Electronic Transmission Fundamentals" by B. Whitfield Griffith, Jr. He explains dot products and contour integrals too. Best regards, Richard Harrison, KB5WZI |
#65
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Wanted to thank you both for having the patients to help with so many explanations over the past few months appreciate it the responces you provided on this thread is rather interesting , i understood some, but find myself not understanding 'all' and worse still, you raised further questions and a eyebrow.... now i must go once again to 'the books' something about this and keep forgetting the name , when a light is shined thru a splitter the 2 "" beams still have a relationship to each other then i think quantum things but even if i expertly understood all these parts, would I have the answers?? seems even w/o a through understanding these things are predictable, so why hasn't anyone built a radio that works on this ? seems it would go faster and further I dunno (referring to the particles that always are opposite once split)(if we could use force to flip one, and the other fliped regardless of distance, than 0/1 streams can be read no? hey people thought people like einstein were nutz too and he was smart m In article , Cecil Moore wrote: ml wrote: what would be the 'momentum' your referring to? is their a knetic/stored piece i am misssing? or are you just referring to like the flywheel effect for ex a large coil might have In 1619, Kepler proposed that it was the pressure (momentum) of sunlight that blows back a comet's tail. Maxwell, in 1873 said: "In a medium in which waves are propagated, there is a pressure (momentum) in the direction normal to the waves ..." From "Optics", by Hecht: "One of the most significant properties of the electromagnetic wave is that it transports energy and momentum." ... "Indeed, whenever we have a flow of energy, it's reasonable to expect that there will be an associated momentum - the two are the related time and space aspects of motion." And, of course, energy and momentum are two things that must necessarily be conserved. The bottom line is that if there are any reflected waves that don't reach the source (and also are not dissipated), they must necessarily have had their direction of energy and momentum reversed back toward the load. Anything else would violate the laws of physics. |
#66
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ml wrote:
then i think quantum things but even if i expertly understood all these parts, would I have the answers?? (Quote from Max Planck) "A new scientific truth does not triumph by convincing its opponents and making them see the light, but rather because its opponents eventually die, and a new generation grows up that is familiar with it." -- 73, Cecil http://www.qsl.net/w5dxp ----== Posted via Newsfeeds.Com - Unlimited-Uncensored-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups ----= East and West-Coast Server Farms - Total Privacy via Encryption =---- |
#67
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On Sat, 25 Jun 2005 00:14:24 GMT, ml wrote:
hey people thought people like einstein were nutz too and he was smart A fellow develops a flat tire and pulls to the side of the road, next to the local insane asylum. As he is removing the flat, and having put the nuts into the hub-cap, he notices an inmate staring at him through the bars of his windowed room. As he remounts the spare, he spills the hub-cap's contents into the storm drain. He begins to swear and pull his hair out - what's he gonna do? From the window: "Remove one nut from each of the other wheels" Stunned, the driver takes the advice and asks, "What are you doing in there?" "I may be crazy, but I'm not stupid." 73's Richard Clark KB7QHC |
#68
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ml wrote:
then i think quantum things but even if i expertly understood all these parts, would I have the answers?? You don't need to "think quantum things" about this problem. The discovery of quantum physics was that energy levels aren't continuous. A "system" (whatever it may be) can only have certain levels of energy - in-between energy levels are not allowed. To change between energy level, the system must emit or absorb quanta of energy. Quantum energy E is related to frequency (f, Hz) by E = h*f, where h is Planck's constant = 6.6 x 10^-34 Joule seconds. At 10MHz, the quantum energy is 0.000 000 000 000 000 000 000 000 0066 joules. This is so small that - for all practical purposes - ANY energy level is possible, and quantum effects at radio frequencies are so small they are irrelevant. So quantum physics has just *confirmed* that, at radio frequencies, classical EM physics is all you need to know. hey people thought people like einstein were nutz too and he was smart The question is: are there any Einsteins here? Antennas and transmission lines are home territory for classical EM physics, right in the middle of our map of existing knowledge. There are still lots of interesting new things to be discovered there; but we know in advance that they MUST join up with the existing map, because it surrounds us on every side. Anybody who imagines he's an Einstein, exploring the outer boundaries... is just plain lost. -- 73 from Ian GM3SEK 'In Practice' columnist for RadCom (RSGB) http://www.ifwtech.co.uk/g3sek |
#69
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thanks for responding Ian: No doubt your correct about alot, and clasically speaking i wouldn't argue, however 2 points firstly my comparsion to einstein wasn't regarding myself i was making a joke that my 'theories /ideas' are often thought of as crazy but who knows regarding your being so firm saying that rf is typically just conventional physics, I dunno.. who says it's confirmed to our space?? we are only just begining to see the possibilities that things in our deminsion/ or time "e space" do in fact have relationships with 'other ' things, some of which might be having effects out of phase, 'time' or having somthing corresponding in another dimension so to speak (for example) it's not unfathomable to think that the sum of our current knowledge might no be infinate, perhaps we've simply failed to measure ? who knows what tomorrows proved new theories will bring? already here waves(rf) conventional were compared to photonic 'energy'(now thats something few can understand alone) and those photos do some really strange things w/regards to the above (even more strange) conventionally speaking your correct of course, but i always keep an open mind towards possibilities, and crazy theories, since rf is still such a not understood umm blackhole or i am just crazy yeah i am just a nutty non scientific type throwing wackey ideas i have into that round black hole hoping that i'll find the right sized peg(my best asylm analogy rich) not cause i want to be known, but it's just fun for me to ponder these things i've already learned alot from you ian thanks again rich and cecil thanks too m In article , Ian White GM3SEK wrote: ml wrote: then i think quantum things but even if i expertly understood all these parts, would I have the answers?? You don't need to "think quantum things" about this problem. The discovery of quantum physics was that energy levels aren't continuous. A "system" (whatever it may be) can only have certain levels of energy - in-between energy levels are not allowed. To change between energy level, the system must emit or absorb quanta of energy. Quantum energy E is related to frequency (f, Hz) by E = h*f, where h is Planck's constant = 6.6 x 10^-34 Joule seconds. At 10MHz, the quantum energy is 0.000 000 000 000 000 000 000 000 0066 joules. This is so small that - for all practical purposes - ANY energy level is possible, and quantum effects at radio frequencies are so small they are irrelevant. So quantum physics has just *confirmed* that, at radio frequencies, classical EM physics is all you need to know. hey people thought people like einstein were nutz too and he was smart The question is: are there any Einsteins here? Antennas and transmission lines are home territory for classical EM physics, right in the middle of our map of existing knowledge. There are still lots of interesting new things to be discovered there; but we know in advance that they MUST join up with the existing map, because it surrounds us on every side. Anybody who imagines he's an Einstein, exploring the outer boundaries... is just plain lost. |
#70
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ml wrote:
already here waves(rf) conventional were compared to photonic 'energy' One conceptual mistake that a lot of people make concerns the roll of free electrons in a transmission line. It is the fields/photons that move at the speed of light, not the electrons. EM energy stored in excited free electrons is unstable and fleeting. The electron always gives up that extra energy very quickly in the form of photons which must necessarily travel at the speed of light and are incapable of some Old Wives' Tale "sloshing" response. Just because the electrons are capable of "sloshing" around doesn't mean that the EM energy can slosh around. The EM wave energy is not confined to the electrons, it exists ultimately in the fields/photons in the form of ExH wave energy/time moving at the speed of light. -- 73, Cecil http://www.qsl.net/w5dxp ----== Posted via Newsfeeds.Com - Unlimited-Uncensored-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups ----= East and West-Coast Server Farms - Total Privacy via Encryption =---- |
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