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#1




Maxwell's Equations; the big fraud?
Whereas some of us can grandly quote the differential form of
Maxwell's Equations with our "Del dot" and "Del cross" notations, I wonder how many, if at all, of us can actually solve what are those 3dimensional differential equations in real situations? Not many, I suspect. And certainly not I in my current stage of electromagnetic revision! 
#2




Maxwell's Equations; the big fraud?
Gareth's Downstairs Computer
wrote: Whereas some of us can grandly quote the differential form of Maxwell's Equations with our "Del dot" and "Del cross" notations, I wonder how many, if at all, of us can actually solve what are those 3dimensional differential equations in real situations? Not many, I suspect. And certainly not I in my current stage of electromagnetic revision! I really don't think anyone can solve them in a real situation, except by using numerical methods on small bits of the real situation and combining them. In which case any of us can probably do it using the right software. Writing the software was probably a bit of a challenge.  Roger Hayter 
#3




Maxwell's Equations; the big fraud?
On 24/10/2018 15:38, Roger Hayter wrote:
Gareth's Downstairs Computer wrote: Whereas some of us can grandly quote the differential form of Maxwell's Equations with our "Del dot" and "Del cross" notations, I wonder how many, if at all, of us can actually solve what are those 3dimensional differential equations in real situations? Not many, I suspect. And certainly not I in my current stage of electromagnetic revision! I really don't think anyone can solve them in a real situation, except by using numerical methods on small bits of the real situation and combining them. In which case any of us can probably do it using the right software. Writing the software was probably a bit of a challenge. That's an interesting observation from a retired medical practitioner! Is there something about your education that you're not telling us? :) Hopefully, I'm working towards an understanding of the innards of such software 
#4




Maxwell's Equations; the big fraud?
On 24/10/2018 16:35, Brian Morrison wrote:
On Wed, 24 Oct 2018 16:26:33 +0100 Gareth's Downstairs Computer wrote: Hopefully, I'm working towards an understanding of the innards of such software Companies such as Ansoft and CST (now owned by Dassault) employ whole buildings full of people with PhDs to do this sort of thing, it's definitely a major undertaking and the end result is quite expensive to buy a licence to use. Where I studied this stuff originally just coming up to 50 years ago, there was never enough time allowed in the courses to really understand what was happening, you just had to recognise the formulae and where to apply them in exam questions. I drifted away from electromagnetics in the 3rd year, specialising in computer engineering, so never really got much past Maxwell, but now, because of the amateur radio interest, especially antennae, I'd now like to take on a deep understanding of what's happening. Taken with my 44 year career as a realtime softy, I'm confident that I shall succeed in my goal unless I lose interest in yet another "vapour" pursuit, as some nonce puts it. What's the officially recognised way to address a PhD recipient? ... .... A burger and fries, please. :) 
#5




Maxwell's Equations; the big fraud?
In rec.radio.amateur.antenna Gareth's Downstairs Computer wrote:
Whereas some of us can grandly quote the differential form of Maxwell's Equations with our "Del dot" and "Del cross" notations, I wonder how many, if at all, of us can actually solve what are those 3dimensional differential equations in real situations? Not many, I suspect. About as many as accountants that balance the company books with a goose quill pen and arithmetic.  Jim Pennino 
#6




Maxwell's Equations; the big fraud?
Gareth's Downstairs Computer
wrote: Whereas some of us can grandly quote the differential form of Maxwell's Equations with our "Del dot" and "Del cross" notations, I wonder how many, if at all, of us can actually solve what are those 3dimensional differential equations in real situations? Not many, I suspect. And certainly not I in my current stage of electromagnetic revision! G is for gurgle.  STC / M0TEY / http://twitter.com/ukradioamateur 
#7




Maxwell's Equations; the big fraud?
On 10/24/2018 11:44 AM, Gareth's Downstairs Computer wrote:
Where I studied this stuff originally just coming up to 50 years ago, there was never enough time allowed in the courses to really understand what was happening, you just had to recognise the formulae and where to apply them in exam questions. I drifted away from electromagnetics in the 3rd year, specialising in computer engineering, so never really got much past Maxwell, but now, because of the amateur radio interest, especially antennae, I'd now like to take on a deep understanding of what's happening. Hello. So you want a "deep" understanding of antenna theory? Pick up a copy of the two volume "bible" set from McGrawHill that I used in a grad school course, "Antenna Theory" by R.E. Collin and F.J. Zucker. These texts will set you back a few bucks. But be warned: If you don't understand that undergrad vector calculus stuff like "curl" and "divergence" used in things such as Green's and Stokes' theorems, you'll be lost in the forest. (Wishing amateur radio folks would stop using the modifier "magnetic" when mentioning loop antennas). Sincerely,  J. B. Wood email: 
#8




Maxwell's Equations; the big fraud?
On 25/10/2018 11:42, J.B. Wood wrote:
On 10/24/2018 11:44 AM, Gareth's Downstairs Computer wrote: Where I studied this stuff originally just coming up to 50 years ago, there was never enough time allowed in the courses to really understand what was happening, you just had to recognise the formulae and where to apply them in exam questions. I drifted away from electromagnetics in the 3rd year, specialising in computer engineering, so never really got much past Maxwell, but now, because of the amateur radio interest, especially antennae, I'd now like to take on a deep understanding of what's happening. Hello. So you want a "deep" understanding of antenna theory?Â* Pick up a copy of the two volume "bible" set from McGrawHill that I used in a grad school course, "Antenna Theory" by R.E. Collin and F.J. Zucker. These texts will set you back a few bucks.Â* But be warned: If you don't understand that undergrad vector calculus stuff like "curl" and "divergence" used in things such as Green's and Stokes' theorems, you'll be lost in the forest.Â* (Wishing amateur radio folks would stop using the modifier "magnetic" when mentioning loop antennas).Â* Sincerely, I have Ramo, Whinnery and Van Duzer, 2nd Ed; also Aharoni. 
#9




Maxwell's Equations; the big fraud?
Gareth's Downstairs Computer
wrote: On 25/10/2018 11:42, J.B. Wood wrote: On 10/24/2018 11:44 AM, Gareth's Downstairs Computer wrote: Where I studied this stuff originally just coming up to 50 years ago, there was never enough time allowed in the courses to really understand what was happening, you just had to recognise the formulae and where to apply them in exam questions. I drifted away from electromagnetics in the 3rd year, specialising in computer engineering, so never really got much past Maxwell, but now, because of the amateur radio interest, especially antennae, I'd now like to take on a deep understanding of what's happening. Hello. So you want a "deep" understanding of antenna theory?Â* Pick up a copy of the two volume "bible" set from McGrawHill that I used in a grad school course, "Antenna Theory" by R.E. Collin and F.J. Zucker. These texts will set you back a few bucks.Â* But be warned: If you don't understand that undergrad vector calculus stuff like "curl" and "divergence" used in things such as Green's and Stokes' theorems, you'll be lost in the forest.Â* (Wishing amateur radio folks would stop using the modifier "magnetic" when mentioning loop antennas).Â* Sincerely, I have Ramo, Whinnery and Van Duzer, 2nd Ed; also Aharoni. G is for garden fence.  STC / M0TEY / http://twitter.com/ukradioamateur 
#10




Maxwell's Equations; the big fraud?
Bernie wrote:
On Thu, 25 Oct 2018 12:58:48 +0100 Gareth's Downstairs Computer wrote: On 25/10/2018 11:42, J.B. Wood wrote: On 10/24/2018 11:44 AM, Gareth's Downstairs Computer wrote: Where I studied this stuff originally just coming up to 50 years ago, there was never enough time allowed in the courses to really understand what was happening, you just had to recognise the formulae and where to apply them in exam questions. I drifted away from electromagnetics in the 3rd year, specialising in computer engineering, so never really got much past Maxwell, but now, because of the amateur radio interest, especially antennae, I'd now like to take on a deep understanding of what's happening. Hello. So you want a "deep" understanding of antenna theory?Â* Pick up a copy of the two volume "bible" set from McGrawHill that I used in a grad school course, "Antenna Theory" by R.E. Collin and F.J. Zucker. These texts will set you back a few bucks.Â* But be warned: If you don't understand that undergrad vector calculus stuff like "curl" and "divergence" used in things such as Green's and Stokes' theorems, you'll be lost in the forest.Â* (Wishing amateur radio folks would stop using the modifier "magnetic" when mentioning loop antennas).Â* Sincerely, I have Ramo, Whinnery and Van Duzer, 2nd Ed; also Aharoni. A donkey carrying a load of holy books is still a donkey. (Traditional Sufi saying.) A Gareth with a Â£350 law book is still getting convicted.  STC / M0TEY / http://twitter.com/ukradioamateur 
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