w4jle wrote:
Jack, with all due respect, you need a hobby... He was just getting his 2-cents worth in! :-) -- -------------------------------------- Diagnosed Type II Diabetes March 5 2001 Beating it with diet and exercise! 297/215/210 (to be revised lower) 58"/43"(!)/44" (already lower too!) -------------------------------------- Visit my HomePage at http://members.shaw.ca/finkirv/ Visit my very special website at http://members.shaw.ca/finkirv4/ Visit my CFSRS/CFIOG ONLINE OLDTIMERS website at http://members.shaw.ca/finkirv5/ -------------------- Irv Finkleman, Grampa/Ex-Navy/Old Fart/Ham Radio VE6BP Calgary, Alberta, Canada |
Reg Edwards wrote:
Ohm is a name of a person. ======================= During which era did Mr Inch live? Wasn't he at Cambridge with Furlong, Yard, Chain and a Polish guy called Rod Perch? I think that was the group that first discovered length, or was it distance? ;-) (Actually derived from Latin, uncia, an ounce.) In fact the SI units don't have a fixed rule for capitalisation. When the unit is spelt out it should not be capitalised - ohm, kelvin, farad - to avoid confusion with the scientist. The abbreviation or symbol should be capitalised for all those named after people and for litre - Hz, L, V. The ohm is normally written with a capital omega or written in full as 'ohm'. Ohm at the beginning of a sentence is capitalised. See http://www.poynton.com/PDFs/Writing_SI_units_(USL).pdf vy 73 Andy, M1EBV |
Someone sed:
"So, the 300/75/50 ohm term, characteristic impedance, is the square root of L/C" ================== Not always! 73 de Jack, K9CUN |
To a first approximation ... YES. In the context of providing a simple
explanation, an introductory level explanation, as in the context of the original question ... YES. In the interest of more advanced analysis: Zo = SQRT[[R + jwL]/[G + jwC]] In a lossless line that converges to SQRT [L/C]. DD JDer8745 wrote: Someone sed: "So, the 300/75/50 ohm term, characteristic impedance, is the square root of L/C" ================== Not always! 73 de Jack, K9CUN |
"In a lossless line that converges to SQRT [L/C]."
There is no such thing as a lossless line. The formula becomes SQRT(L/C) as the frequency increases, but the losses don't go away. In fact losses of TLs increase as frequency increases. Nice graphs of this in the Handbook. 73 de jack, K9CUN |
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