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Plate Resistance
On Fri, 4 Jun 2010 11:11:02 -0700 (PDT), walt wrote:
Although Rp is definitely a factor in determining the value of load resistance RL, it is by no means the total source resistance RL, as others have insisted. Hi Walt, Do you have other Data to replace into your copy of Terman's equation? I got the impression you were satisfied with his work and his conclusions. Myself, I would say Terman's are suitable but incomplete and additional data wouldn't change anything as he presented a classic case. Hemenway, Henry, and Caulton go miles beyond merely suggesting that there are partial derivative forms (you can choose to offer your own from Terman if you can find them), and they give the full treatment from soup to nuts in chapters outside of the one I have distributed. As for the comparison of Rp to RL, yes, it is not complete and in fact although they closely agree, that is only a first cut. Refinement may go as far as 10s of percent shifts and with the accumulation of possible errors, that shift might still resolve to Rp = RL. However, if Rp (or its distant cousin Rpd) slips in value away from RL, then the match is going to migrate away from the Conjugate basis Z match towards some other solution. I cannot see how it could be otherwise unless there were some undocumented and unmeasurable R (not real) were to combine to balance the books. If there's a match, the Data and the numerous counter arguments to you seem to prefer an image basis Z match. I don't hold much confidence in that outcome either. 73's Richard Clark, KB7QHC |
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