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1. [Amps] Measuring RF Power (score: 1): Author: "Harold B. Mandel" <ka1xo@juno.com>; Date: Mon, 21 Mar 2005 11:15:15 -0500; In the cellular telephone RF world measuring power has become a critical function because the difference of 1 decibel can affect the operation of a 'cell site with three sectors, eight channels per r; /archives//html/Amps/2005-03/msg00452.html (9,520 bytes)
2. Re: [Amps] Measuring RF Power (score: 1): Author: Tony King - W4ZT <amps@w4zt.com>; Date: Mon, 21 Mar 2005 11:53:31 -0500; It may be worth mentioning that RMS is the usual method of defining a DC equivalent which, given a pure waveform, will be about the same as the average. With distorted waveforms RMS will not define t; /archives//html/Amps/2005-03/msg00454.html (7,403 bytes)
3. Re: [Amps] Measuring RF Power (score: 1): Author: "Chris Trask" <christrask@earthlink.net>; Date: Mon, 21 Mar 2005 09:58:29 -0700; The "obsolete" test equipment that flooded the surplus market about 12 years ago when the defense contractors went bust was a goldmine for those of us who were (and still are) doing consulting work.; /archives//html/Amps/2005-03/msg00455.html (9,553 bytes)
4. Re: [Amps] Measuring RF Power (score: 1): Author: Gary Schafer <garyschafer@comcast.net>; Date: Mon, 21 Mar 2005 12:08:22 -0500; It may also be worth mentioning that there really is no such thing as "RMS power". The proper term is average power. RMS is only valid in terms of voltage or current. You can find an RMS value of pow; /archives//html/Amps/2005-03/msg00456.html (8,027 bytes)
5. Re: [Amps] Measuring RF Power (score: 1): Author: R.Measures <r@somis.org>; Date: Mon, 21 Mar 2005 09:36:44 -0800; It's fairly useful for heating water. Richard L. Measures, AG6K, 805.386.3734. www.somis.org _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contest; /archives//html/Amps/2005-03/msg00462.html (8,509 bytes)
6. Re: [Amps] Measuring RF Power (score: 1): Author: Gary Schafer <garyschafer@comcast.net>; Date: Mon, 21 Mar 2005 13:06:21 -0500; Only average power is useful. 73 Gary K4FMX _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2005-03/msg00467.html (8,706 bytes)
7. Re: [Amps] Measuring RF Power (score: 1): Author: "Gary Smith" <wa6fgi@sbcglobal.net>; Date: Mon, 21 Mar 2005 12:51:02 -0800; I think (?) I understand what Harold is talking about, sure is nice to have a site where there is more that the usual chatter being tossed back and forth. Fwiw, its gentlemen such are these on this f; /archives//html/Amps/2005-03/msg00470.html (8,772 bytes)
8. Re: [Amps] Measuring RF Power (score: 1): Author: "Harold B. Mandel" <ka1xo@juno.com>; Date: Mon, 21 Mar 2005 16:15:10 -0500; Dear Gary, You're acquainted with 3-phase electricity, yes? Imagine looking down the edge of the wire and seeing waveforms, infinitely thin, popping out at 0, 120 and 270 degrees. Kind of vector-ish,; /archives//html/Amps/2005-03/msg00471.html (8,509 bytes)
9. Re: [Amps] Measuring RF Power (score: 1): Author: "Gary Smith" <wa6fgi@sbcglobal.net>; Date: Mon, 21 Mar 2005 14:02:38 -0800; Harold: thanks for the electrical lesson. Umm... three phase electricity. Latest of locomotives with a.c traction motors were three phase to control the jerk-forward snap-back action of the first ser; /archives//html/Amps/2005-03/msg00472.html (9,812 bytes)
10. Re: [Amps] Measuring RF Power (score: 1): Author: "John Coleman" <wa5bxo@pctechref.com>; Date: Mon, 21 Mar 2005 17:39:43 -0600; A number of years ago I came up with a very accurate method of measuring the power on a heath kit "cantenna" dummy load. They had a piece of junk circuit in a box on the top for some relative meterin; /archives//html/Amps/2005-03/msg00473.html (9,419 bytes)
11. Re: [Amps] Measuring RF Power (score: 1): Author: R.Measures <r@somis.org>; Date: Tue, 22 Mar 2005 07:47:48 -0800; Average power is not a measure of heating ability. RMS power is a measure of heating ability. cr Richard L. Measures, AG6K, 805.386.3734. www.somis.org _______________________________________________; /archives//html/Amps/2005-03/msg00484.html (9,366 bytes)
12. Re: [Amps] Measuring RF Power (score: 1): Author: Gary Schafer <garyschafer@comcast.net>; Date: Tue, 22 Mar 2005 11:16:57 -0500; That's a common misconception. Only RMS voltage or RMS current through a resistor produces the equivalent heating that the same value DC voltage or current provide into that same resistor. When calcu; /archives//html/Amps/2005-03/msg00485.html (10,683 bytes)
13. Re: [Amps] Measuring RF Power (score: 1): Author: R.Measures <r@somis.org>; Date: Tue, 22 Mar 2005 09:50:33 -0800; I disagree. . Richard L. Measures, AG6K, 805.386.3734. www.somis.org _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo; /archives//html/Amps/2005-03/msg00490.html (11,071 bytes)
14. Re: [Amps] Measuring RF Power (score: 1): Author: Gary Schafer <garyschafer@comcast.net>; Date: Tue, 22 Mar 2005 14:18:23 -0500; 1. How much peak power do you get when you have 10 volts peak across a 50 ohm resistor? @ 2 watts. 2. What is the average power across that resistor? @ 1 watt. (average power = 1/2 peak power) 3. If; /archives//html/Amps/2005-03/msg00493.html (12,581 bytes)
15. Re: [Amps] Measuring RF Power (score: 1): Author: TexasRF@aol.com; Date: Tue, 22 Mar 2005 14:57:40 EST; I lost track of who said what/when; In a sine wave the average voltage is zero therefore average power is zero.In an ac circuit with sine wave voltage, average current is also zero. One could be led; /archives//html/Amps/2005-03/msg00496.html (8,595 bytes)
16. Re: [Amps] Measuring RF Power (score: 1): Author: Dennis12Amplify@aol.com; Date: Tue, 22 Mar 2005 15:18:47 EST; I lost track of who said what/when; In a sine wave the average voltage is zero therefore average power is zero.In an ac circuit with sine wave voltage, average current is also zero. One could be led; /archives//html/Amps/2005-03/msg00497.html (8,698 bytes)
17. Re: [Amps] Measuring RF Power (score: 1): Author: Gary Schafer <garyschafer@comcast.net>; Date: Tue, 22 Mar 2005 15:25:09 -0500; If what you say was true then there would never be any power into our transmission lines. Average power is not zero simply because there is no negative power. There is only RMS voltage and RMS curren; /archives//html/Amps/2005-03/msg00498.html (9,381 bytes)
18. Re: [Amps] Measuring RF Power (score: 1): Author: Bill Fuqua <wlfuqu00@uky.edu>; Date: Tue, 22 Mar 2005 15:41:50 -0500; The following is an example that I presented some time ago on AMPS. Hope it is useful again. The biggest problem is that for some reason the registration of the values in the columns do not line up w; /archives//html/Amps/2005-03/msg00499.html (12,703 bytes)
19. Re: [Amps] Measuring RF Power (score: 1): Author: Gary Schafer <garyschafer@comcast.net>; Date: Tue, 22 Mar 2005 16:04:27 -0500; The RMS value of a power wave form is not the same as finding the RMS voltage value, squaring it and dividing by resistance. 73 Gary K4FMX _______________________________________________ Amps mailing; /archives//html/Amps/2005-03/msg00500.html (10,061 bytes)
20. Re: [Amps] Measuring RF Power (score: 1): Author: Dennis12Amplify@aol.com; Date: Tue, 22 Mar 2005 16:15:46 EST; The RMS value of a power wave form is not the same as finding the RMS voltage value, squaring it and dividing by resistance. Exactly what does a power waveform look like? Please read completely befor; /archives//html/Amps/2005-03/msg00501.html (8,555 bytes)

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