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21. [AMPS] Feedback path 3-500Z (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Thu, 28 Sep 2000 16:29:02 +0100; Thanks Marv. That plate choke must have a lot of RF circulating current in it on 3.5MHz, then. Calculating the various resonances in that lot isn't trivial; you can see that depending on band and tun; /archives//html/Amps/2000-09/msg01152.html (8,324 bytes)
22. [AMPS] Feedback path 3-500Z (score: 1): Author: i4jmy@iol.it (i4jmy@iol.it); Date: Thu, 28 Sep 2000 17:48:24 +0200; Which resonance ? Certainly not below 2 MHz ! Plate choke resonances, a matter on HIGHER frequencies, are determined by their inductance and capacitance between turns, not by choke and bypass capacit; /archives//html/Amps/2000-09/msg01153.html (9,841 bytes)
23. [AMPS] Feedback path 3-500Z (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Thu, 28 Sep 2000 16:56:23 +0100; 50 microhenries of plate choke with the shunt plate tuning capacitor, and the capacity of the loading capacitor in parallel (as it is connected through the long lead that is the tank coil), bearing i; /archives//html/Amps/2000-09/msg01154.html (8,749 bytes)
24. [AMPS] Feedback path 3-500Z (score: 1): Author: 2@vc.net (measures); Date: Thu, 28 Sep 2000 10:44:35 -0700; anodes/VHF suppressors/50uH choke/1000pF bypass to gnd/8uH choke/ 1000pF bypass to gnd. end - Rich..., 805.386.3734, www.vcnet.com/measures. end -- FAQ on WWW: http://www.contesting.com/FAQ/amps Sub; /archives//html/Amps/2000-09/msg01157.html (8,797 bytes)
25. [AMPS] Feedback path 3-500Z (score: 1): Author: 2@vc.net (measures); Date: Thu, 28 Sep 2000 10:44:37 -0700; Tom graciously accepts his grid/plate osc. theory as gospel. Meanwhile, no SB-220 owner that I have talked to has observed Mr. Rauch's alleged VLF grid-plate oscillation. end - Rich..., 805.386.3734; /archives//html/Amps/2000-09/msg01159.html (8,920 bytes)
26. [AMPS] Feedback path 3-500Z (score: 1): Author: i4jmy@iol.it (Maurizio Panicara); Date: Thu, 28 Sep 2000 20:04:27 +0200; Please show me the reactive components involved in the claimed resonance and how, and where, they are connected. 73, Mauri I4JMY the the a high inherent resonance -- FAQ on WWW: http://www.contesting; /archives//html/Amps/2000-09/msg01161.html (9,388 bytes)
27. [AMPS] Feedback path 3-500Z (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Thu, 28 Sep 2000 17:07:49 -0400; The units I measured had a parallel anode resonance (with the output port terminated) of over 10,000 ohms somewhat below the AM BC band. The circuit involves the blocking capacitor, the plate choke,; /archives//html/Amps/2000-09/msg01163.html (9,901 bytes)
28. [AMPS] Feedback path 3-500Z (score: 1): Author: 2@vc.net (measures); Date: Thu, 28 Sep 2000 15:30:22 -0700; Wolf!, wolf! any port in a storm. When driven, a SB-220's grid potential is typically under 6v and the grid current is c. 170mA. Thus, the grid looks like 30-something ohms. . In the Rauchian world,; /archives//html/Amps/2000-09/msg01164.html (10,619 bytes)
29. [AMPS] Feedback path 3-500Z (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Thu, 28 Sep 2000 19:33:52 -0400; Nice try at clouding the issue. No cigar though. Grid resistance is very high when the amp isn't being driven, and it is very high for parts of the RF cycle when there is no grid current. 73, Tom W8J; /archives//html/Amps/2000-09/msg01165.html (9,122 bytes)
30. [AMPS] Feedback path 3-500Z (score: 1): Author: 2@vc.net (measures); Date: Thu, 28 Sep 2000 20:00:43 -0700; A VLF oscillation allegedly destroys parts, yet there is supposedly no grid current. - Rich..., 805.386.3734, www.vcnet.com/measures. end -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submission; /archives//html/Amps/2000-09/msg01166.html (9,244 bytes)
31. [AMPS] Feedback path 3-500Z (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Fri, 29 Sep 2000 08:22:37 +0100; 1. 50 uH in parallel with the combination of plate tank tuning capacitor and series coupling cap and series bypass cap. 2.The plate tank capacity is the capacity of the tuning capacitor plus the shun; /archives//html/Amps/2000-09/msg01167.html (9,492 bytes)
32. [AMPS] Feedback path 3-500Z (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Fri, 29 Sep 2000 08:42:49 +0100; Hmm......I think you mean 'at HF, using usual chokes'. It's not an uncommon practice in VHF amps, and used to be pretty usual in 'good ol' fashioned' Class C designs at HF, always with the caveat abo; /archives//html/Amps/2000-09/msg01168.html (10,080 bytes)
33. [AMPS] Feedback path 3-500Z (score: 1): Author: i4jmy@iol.it (i4jmy@iol.it); Date: Fri, 29 Sep 2000 13:24:58 +0200; capacitor and Going from PS to plate: Several uF HV cap filter is in parallel with 1000 pf Bypass, reactance is several uF//1000pf, a like a short (-j0) on VLF. The 8 uH inductor is in series with t; /archives//html/Amps/2000-09/msg01169.html (12,758 bytes)
34. [AMPS] Feedback path 3-500Z (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Fri, 29 Sep 2000 12:47:15 +0100; My original comment was that there would be a resonance somewhere between probably 0.5 and 2MHz. I made no comment about 200kHz. 73 Peter G3RZP -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submi; /archives//html/Amps/2000-09/msg01172.html (9,064 bytes)
35. [AMPS] Feedback path 3-500Z (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Fri, 29 Sep 2000 07:49:31 -0400; 200 KHz. The 1000 pF blocking capacitor can easily look like j800 or any other value depending on the load at the output of the pi-net. Do you agree or disagree with that? I can look at the anode wi; /archives//html/Amps/2000-09/msg01173.html (10,274 bytes)
36. [AMPS] Feedback path 3-500Z (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Fri, 29 Sep 2000 07:49:31 -0400; I knew we'd eventually get you to admit your error. You claim a VHF oscillation will do the same thing. 73, Tom W8JI w8ji@contesting.com -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions:; /archives//html/Amps/2000-09/msg01174.html (8,974 bytes)
37. [AMPS] Feedback path 3-500Z (score: 1): Author: i4jmy@iol.it (i4jmy@iol.it); Date: Fri, 29 Sep 2000 15:31:17 +0200; Hi Tom, I did explain what sort of load its needed to have the blocking cap lead j872.6 Ohm equivalent reactance and also that I substantially agree that PI is mostly ininfluent to produce it. Anyway; /archives//html/Amps/2000-09/msg01175.html (11,315 bytes)
38. [AMPS] Feedback path 3-500Z (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Fri, 29 Sep 2000 14:22:15 -0400; It's a big world out there Mauri, with many kinds of loads having many kinds of characteristics, I never said it was a frequent even in the real world, I just said it could be made to happen and can; /archives//html/Amps/2000-09/msg01180.html (11,319 bytes)
39. [AMPS] Feedback path 3-500Z (score: 1): Author: 2@vc.net (measures); Date: Fri, 29 Sep 2000 11:43:36 -0700; ? For background information, see *The Emperor's New Clothes* by Hans C. Anderson. ciao, Mauri - Rich..., 805.386.3734, www.vcnet.com/measures. end -- FAQ on WWW: http://www.contesting.com/FAQ/amps; /archives//html/Amps/2000-09/msg01182.html (12,905 bytes)
40. [AMPS] Feedback path 3-500Z (score: 1): Author: 2@vc.net (measures); Date: Fri, 29 Sep 2000 11:43:40 -0700; ? No one that I know has seen Mr Rauch's alleged 205KHz oscillation in a SB-220. At least two people have seen the 220's normal damped wave ringing at 110MHz on a spectrum analyzer. on and on and on; /archives//html/Amps/2000-09/msg01183.html (10,128 bytes)

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