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There was a big discussion about this last year, and somebody posted that the ARRL was going to eliminate the conjugate reference. Tam/WB2TT Going to? It says 2000 on that ARRL Handbook! They are NOT going to eliminate the conjugate reference, because it's correct. Point of fact: in the current 20th edition, dated 2003, it has gone. It had been correct; then they incorrectly revised it; now it has been corrected again. -- 73 from Ian GM3SEK 'In Practice' columnist for RadCom (RSGB) http://www.ifwtech.co.uk/g3sek |
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However, in almost all practical calculations, Zo is purely real, ... Nope, "purely real" requires a special expensive line. I forget what they call it. Ordinary feedline is not purely real however close it might be. -- 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 =--- |
Ian White GM3SEK wrote: There was a big discussion about this last year, and somebody posted that the ARRL was going to eliminate the conjugate reference. Tam/WB2TT Going to? It says 2000 on that ARRL Handbook! They are NOT going to eliminate the conjugate reference, because it's correct. Point of fact: in the current 20th edition, dated 2003, it has gone. It had been correct; then they incorrectly revised it; now it has been corrected again. Point of fact: If Zo is purely real, then Zo*=Zo, and so both forms are correct in this case. S. |
Cecil Moore wrote: wrote: However, in almost all practical calculations, Zo is purely real, ... Nope, "purely real" requires a special expensive line. I forget what they call it. Ordinary feedline is not purely real however close it might be. -- I don't care how much it costs, your line is NEVER going to be 100% purely real! There is always a gap between mathematical ideals and reality. So i totally agree with you. But for most practical calculations, Zo can be considered purely real, and your calculations will be close. S. |
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I don't care how much it costs, your line is NEVER going to be 100% purely real! There is always a gap between mathematical ideals and reality. Therefore, Z0 will never equal Z0*? One can purchase test leads guaranteed within a certain percentage at a certain frequency. I believe it occurs when G/C = R/L or some such. -- 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 =--- |
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I don't care how much it costs, your line is NEVER going to be 100% purely real! There is always a gap between mathematical ideals and reality. Therefore, Z0 will never equal Z0*? One can purchase test leads guaranteed within a certain percentage at a certain frequency. I believe it occurs when G/C = R/L or some such. -- 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 =--- |
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I don't care how much it costs, your line is NEVER going to be 100% purely real! There is always a gap between mathematical ideals and reality. Therefore, Z0 will never equal Z0*? One can purchase test leads guaranteed within a certain percentage at a certain frequency. I believe it occurs when G/C = R/L or some such. -- 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 =--- |
Cecil Moore wrote: wrote: I don't care how much it costs, your line is NEVER going to be 100% purely real! There is always a gap between mathematical ideals and reality. Therefore, Z0 will never equal Z0*? Never exactly, but they will be damn close most of the time, unless your coax is really cheap/bad. One can purchase test leads guaranteed within a certain percentage at a certain frequency. I believe it occurs when G/C = R/L or some such. -- 73, Cecil http://www.qsl.net/w5dxp If Zo=50+j0.000000000001, then it's close enough! S. |
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Richard Clark wrote: On 20 Jun 2005 01:00:51 -0700, wrote: If Zo=50+j0.000000000001, And it is not then it's close enough! hence it follows from this logic, it is not close enough. Even if Zo=50+j2, then the VSWR will still be very close to a 1:1 match. You antenna boys don't build too many power amplifiers, obviously. Slick |
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