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1. [Amps] load capacitor ratings? (score: 1): Author: "Neil Carr G0JHC" <g0jhc@blueyonder.co.uk>; Date: Mon, 30 Aug 2004 08:08:04 +0100; How do I work out the voltage requirements for my load capacitor in a Pi-L? This will be a fixed freq amp designed and set-up without the need for large VSWR tolerances. I've searched the amp archive; /archives//html/Amps/2004-08/msg00447.html (6,408 bytes)
2. Re: [Amps] load capacitor ratings? (score: 1): Author: R.Measures <r@somis.org>; Date: Mon, 30 Aug 2004 01:29:11 -0700; Neil -- Voltage (E) depends on the Pi-L's intermediate Z and on P. For 300-ohms and 1500W, using E = (PxR)^0.5, E = 450,000^0.5 = 670Vrms or 950V-peak. cheerz On Aug 30, 2004, at 12:08 AM, Neil Carr; /archives//html/Amps/2004-08/msg00448.html (7,518 bytes)
3. [Amps] load capacitor ratings? (score: 1): Author: Will Matney <craxd1@ezwv.com>; Date: Mon, 30 Aug 2004 12:13:07 -0400; Simple, Determine the voltage across the 50 ohm load from the power in watts. Then use a load capacitor with a voltage rating equal to or up to two times the load voltage. The tune control is two tim; /archives//html/Amps/2004-08/msg00454.html (7,603 bytes)
4. Re: [Amps] load capacitor ratings? (score: 1): Author: Will Matney <craxd1@ezwv.com>; Date: Mon, 30 Aug 2004 20:37:47 -0400; Rich, Exactly. I talked to the owner of Oren Elliot (Orens son Stephen) several years ago about this and what he thought the rating should be. He had several thoughts on this but told me that most we; /archives//html/Amps/2004-08/msg00461.html (12,713 bytes)
5. Re: [Amps] load capacitor ratings? (score: 1): Author: Will Matney <craxd1@ezwv.com>; Date: Mon, 30 Aug 2004 21:20:54 -0400; I failed to mention that the values I were mentioning earlier, in the designs I was using, were for a Pi tank circuit and not a Pi-L. Thus the load C would have seen a different load resistance of ab; /archives//html/Amps/2004-08/msg00462.html (7,387 bytes)
6. Re: [Amps] load capacitor ratings? (score: 1): Author: R.Measures <r@somis.org>; Date: Mon, 30 Aug 2004 22:20:04 -0700; On Aug 30, 2004, at 5:37 PM, Will Matney wrote: Rich, Exactly. I talked to the owner of Oren Elliot (Orens son Stephen) several years ago about this and what he thought the rating should be. He had s; /archives//html/Amps/2004-08/msg00468.html (9,862 bytes)
7. Re: [Amps] load capacitor ratings? (score: 1): Author: Will Matney <craxd1@ezwv.com>; Date: Tue, 31 Aug 2004 01:42:15 -0400; Rich, 1500 watts PEP on a 300 ohm load. Sqrt of 1500 X 300 = 670.8 Volts. 1500 v x 300 ohms = 450,000 and the sqrt of 450,000 = 670.8. On a 50 ohm load, 1500 watts PEP x 50 = 75,000 and the sqrt of 7; /archives//html/Amps/2004-08/msg00469.html (9,775 bytes)
8. Re: [Amps] load capacitor ratings? (score: 1): Author: Will Matney <craxd1@ezwv.com>; Date: Tue, 31 Aug 2004 01:52:19 -0400; Rich, This insulation material that they said was nylon, looked as if they dipped the stator assembly in it as a liquid and let it dry. It still gave enough clearance for the rotor plates to move fre; /archives//html/Amps/2004-08/msg00470.html (11,112 bytes)
9. Re: [Amps] load capacitor ratings? (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Tue, 31 Aug 2004 08:03:51 +0200; Actually, no. A peak reading wattmeter will show PEP, which by definition is the power delivered to the load during one or more RF cycles at the peak of the modulation envelope. If the peak voltage f; /archives//html/Amps/2004-08/msg00471.html (11,634 bytes)
10. Re: [Amps] load capacitor ratings? (score: 1): Author: Will Matney <craxd1@ezwv.com>; Date: Tue, 31 Aug 2004 02:07:46 -0400; Rich, Yep, your correct, I wasn't thinking about the differences in the readings. So in turn it would double the voltage values. Don't know why I was thinking that, must be getting senile? Will R. Me; /archives//html/Amps/2004-08/msg00472.html (11,633 bytes)
11. Re: [Amps] load capacitor ratings? (score: 1): Author: Will Matney <craxd1@ezwv.com>; Date: Tue, 31 Aug 2004 02:54:43 -0400; I wanted to take a look at OEP's variable inductor and see what it said on their website and in the catalog I have here. The website says they're using a glass-phenolic core. The printed catalog said; /archives//html/Amps/2004-08/msg00473.html (13,638 bytes)
12. Re: [Amps] load capacitor ratings? (score: 1): Author: R.Measures <r@somis.org>; Date: Tue, 31 Aug 2004 06:03:59 -0700; On Aug 30, 2004, at 11:54 PM, Will Matney wrote: I wanted to take a look at OEP's variable inductor and see what it said on their website and in the catalog I have here. The website says they're usin; /archives//html/Amps/2004-08/msg00475.html (14,472 bytes)

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