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1. [AMPS] Pi-Net math Help (score: 1): Author: measures@vc.net (Rich Measures); Date: Fri, 6 Aug 1999 01:17:01 -0700; ? Isn't there a loaded Q and an unloaded Q? ? Agreed. . And how much improvement do the new, improved formulas afford the user? Ian calculated 5.57 uH. I calculated 5.06uH using the old, less than p; /archives//html/Amps/1999-08/msg00129.html (10,258 bytes)
2. [AMPS] Clipperton L Plate Choke (score: 1): Author: measures@vc.net (Rich Measures); Date: Fri, 6 Aug 1999 01:16:55 -0700; ? At least 5% from the edge of a ham band. ? 200uH is plenty for 160m operation. // There's some info on my Web site about winding HV-RFCs. - cheers, Jeff Rich... R. L. Measures, 805-386-3734, AG6K,; /archives//html/Amps/1999-08/msg00128.html (7,714 bytes)
3. [AMPS] Pi-Net math (score: 1): Author: measures@vc.net (Rich Measures); Date: Fri, 6 Aug 1999 01:16:54 -0700; ? What is the "output device"? Rich... R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures -- FAQ on WWW: http://www.contesting.com/ampfaq.html Submissions: amps@contesting.com Administrative; /archives//html/Amps/1999-08/msg00127.html (9,359 bytes)
4. [AMPS] Pi-Net math (score: 1): Author: measures@vc.net (Rich Measures); Date: Fri, 6 Aug 1999 01:16:52 -0700; Eimac defines Q using RL. Q = RL/XC1. My contention is that with RL and Ro connected to the Pi-network, the resonant frequency is neither decreased nor increased. ...... Rich... R. L. Measures, 805-; /archives//html/Amps/1999-08/msg00126.html (9,362 bytes)
5. [AMPS] Pi-Net math (score: 1): Author: measures@vc.net (Rich Measures); Date: Thu, 5 Aug 1999 15:53:13 -0700; ? There are nevertheless two ways to define Q. ? You can read it on pages 35, 36, and 37 in *Care and Feeding of Power Grid tubes. Q is used in all three formulas. Q is not calculated. Q is selected; /archives//html/Amps/1999-08/msg00121.html (10,070 bytes)
6. R: [AMPS] L-Pi net...downside? (score: 1): Author: measures@vc.net (Rich Measures); Date: Thu, 5 Aug 1999 13:36:21 -0700; ? If the reactance of the inductor is equal to the reactance of the capacitor, the L-network presents a short to the generator. What is the impedance of a series-resonant circuit? lazy. ? Are Ian's; /archives//html/Amps/1999-08/msg00119.html (10,354 bytes)
7. R: [AMPS] L-Pi net...downside? (score: 1): Author: measures@vc.net (Rich Measures); Date: Thu, 5 Aug 1999 13:36:19 -0700; The difference is not large, Mike. Rich... R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures -- FAQ on WWW: http://www.contesting.com/ampfaq.html Submissions: amps@contesting.com Administra; /archives//html/Amps/1999-08/msg00118.html (8,876 bytes)
8. R: [AMPS] L-Pi net...downside? (score: 1): Author: measures@vc.net (Rich Measures); Date: Thu, 5 Aug 1999 12:44:37 -0700; ? hear, hear. Rich... R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures -- FAQ on WWW: http://www.contesting.com/ampfaq.html Submissions: amps@contesting.com Administrative requests: amps-R; /archives//html/Amps/1999-08/msg00117.html (9,031 bytes)
9. R: R: [AMPS] L-Pi net...downside? (score: 1): Author: measures@vc.net (Rich Measures); Date: Thu, 5 Aug 1999 12:44:35 -0700; ? Mauri -- Is someone forcing you to read the thread about resonance of Pi-networks? Rich... R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures -- FAQ on WWW: http://www.contesting.com/ampfa; /archives//html/Amps/1999-08/msg00116.html (6,866 bytes)
10. R: [AMPS] L-Pi net...downside? (score: 1): Author: measures@vc.net (Rich Measures); Date: Thu, 5 Aug 1999 09:40:39 -0700; ? The Eimac definition of R/XC1 is one. The other definition of Q is a lot more complicated and gives a different result. I use Eimac Q. I am lazy. ? When an L-network is resonant, it is a dead shor; /archives//html/Amps/1999-08/msg00112.html (11,430 bytes)
11. R: [AMPS] L-Pi net...downside? (score: 1): Author: measures@vc.net (Rich Measures); Date: Thu, 5 Aug 1999 05:16:24 -0700; ? Would this sort of resonance be likely to register on a dipmeter? Rich... R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures -- FAQ on WWW: http://www.contesting.com/ampfaq.html Submission; /archives//html/Amps/1999-08/msg00106.html (10,413 bytes)
12. [AMPS] Pi-Net math (score: 1): Author: measures@vc.net (Rich Measures); Date: Thu, 5 Aug 1999 05:16:21 -0700; ? I don't have one. Eimac defines Q as the ratio between RL and the reactance of C1. None of the Eimac formulae can be used without choosing a value of Q - as defined by their definition . ? A defin; /archives//html/Amps/1999-08/msg00105.html (13,827 bytes)
13. [AMPS] Pi-Net math (score: 1): Author: measures@vc.net (Rich Measures); Date: Wed, 4 Aug 1999 16:36:43 -0700; ? There is more than one way to figure Q. ? [chortle] ok ? To do it right, we really need to connect 2000-ohms across C1 and 50-ohms across C2. Want to make a wild guess as to whether this will incr; /archives//html/Amps/1999-08/msg00097.html (10,687 bytes)
14. [AMPS] 2 amp questions (score: 1): Author: measures@vc.net (Rich Measures); Date: Wed, 4 Aug 1999 15:06:13 -0700; Wired into the actual circuit works well. Rich... R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures -- FAQ on WWW: http://www.contesting.com/ampfaq.html Submissions: amps@contesting.com Adm; /archives//html/Amps/1999-08/msg00093.html (7,405 bytes)
15. [AMPS] Pi-Net math (score: 1): Author: measures@vc.net (Rich Measures); Date: Wed, 4 Aug 1999 12:36:15 -0700; ? Where is the alleged approximation problem in the Care and Feeding formulae? Rich... R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures -- FAQ on WWW: http://www.contesting.com/ampfaq.html; /archives//html/Amps/1999-08/msg00091.html (8,231 bytes)
16. [AMPS] Pi-Net math (score: 1): Author: measures@vc.net (Rich Measures); Date: Wed, 4 Aug 1999 09:05:32 -0700; ? With Eimac's *Care and Feeding of Power Grid Tubes* formulae, Q is Definined as RL divided by the reactance of C1. There is no approximation. - On my Web site, there is an Excel 4 worksheet that p; /archives//html/Amps/1999-08/msg00088.html (9,268 bytes)
17. [AMPS] SB-220 input circuit (score: 1): Author: measures@vc.net (Rich Measures); Date: Wed, 4 Aug 1999 04:52:28 -0700; ? What was the failure mode for the kaput cathode coupling capacitors? ? Accessing the tuned inputs requires removing the front panel. For a SB-220 this should take no more than ten minutes. - cheer; /archives//html/Amps/1999-08/msg00085.html (9,437 bytes)
18. R: [AMPS] L-Pi net...downside? (score: 1): Author: measures@vc.net (Rich Measures); Date: Wed, 4 Aug 1999 04:39:07 -0700; ? I am familar with control grid resonance. For the 3-500Z, this is 80 - 90 MHz. What is anti-resonant frequency of the control grid, Tom?. ? RL = 2000 ohms. R out equals 50-ohms. Freq = 7.00MHz. Q; /archives//html/Amps/1999-08/msg00084.html (9,883 bytes)
19. R: [AMPS] L-Pi net...downside? (score: 1): Author: measures@vc.net (Rich Measures); Date: Tue, 3 Aug 1999 09:59:34 -0700; ? Do you believe that a Pi-network is resonant on the working frequency, Peter? Rich... R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures -- FAQ on WWW: http://www.contesting.com/ampfaq.htm; /archives//html/Amps/1999-08/msg00077.html (8,747 bytes)
20. R: [AMPS] L-Pi net...downside? (score: 1): Author: measures@vc.net (Rich Measures); Date: Tue, 3 Aug 1999 07:36:13 -0700; ? the dip you see with a dipmeter coupled to a Pi-network is not on the operating frequency. . Rich... R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures -- FAQ on WWW: http://www.contesting; /archives//html/Amps/1999-08/msg00075.html (8,510 bytes)

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