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## [AMPS] construction of parasitics

 To: [AMPS] construction of parasitics 2@vc.net (2) Tue, 24 Jul 2001 07:00:09 -0700
 ```> >Hi Skipp, > >I have a serious question, and I think the answer would be of great >use to many people. > /\ Quite possibly not to those who read AMPS without a filter, Mr. Rauch. >> So I did the proper math home work to figure out >> the coil inductance values for my suppressors which >> were right in line with Rich's paperwork. My math >> and testing came up with inductance values about >> 85 to 95% of the suppressor kit values. > >Can you share the formula you use in determining the amount of L >and R required to stabilize an amplifier? > /\ There is nary a magic answer or esoteric formula. - In "Parasites in Transmitters" (1935) Mr. G.W. Fyler said that adding resistance to parasite-resonant circuits is the cure. Determining how much resistance is largely a trial and error process aided by educated guesswork and pervasive glitch* protection. >I can use a series of measurements to determine the approximate >value of R and L in most cases, but I've also found many cases >that require testing of several PA's to optimize suppression. A >simple formula would certainly save work! > /\ First off, one needs to realize that roughly equal currents need to flow in L=supp and R-supp at the anode's VHF resonant freq. Secondly, the electromagnetic fields of R-supp and L-supp need to be perpindicular. Thirdly, adjust L-supp to cause R-supp to dissipate maximal heat at 29MHz. - But alas, I know it is definitely difficult to teach old dogmatists new tricks. > cheers * American Heritage Dictionary: - "Probably from Yiddish glitsh, a slip, lapse, from glitshn, to slip, from Middle High German glitschen" ... - WORD HISTORY: Although in retrospect glitch seems to be a word that people would always have found useful, it is first recorded in English in 1962 in the writing of John Glenn: ³Another term we adopted to describe some of our problems was ?glitch.¹² Glenn then gives the technical sense of the word the astronauts had adopted: ³Literally, a glitch is a spike or change in voltage in an electrical current.² In this very passage we see how the word moved from its narrow, technical electronic sense to a more general sense, even if the astronauts were not necessarily the first to extend the meaning of glitch. Since then the word has passed beyond technical use and now covers a wide variety of malfunctions and mishaps. - R. L. Measures, 805.386.3734,AG6K, www.vcnet.com/measures. end -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com Problems: owner-amps@contesting.com ```
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