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81. Re: [Amps] transformers (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Mon, 17 Jul 2006 06:19:13 -0400; Be sure you read the reflected power on a suitable slug. I have very few things, other than commercial loads, that are !:1 SWR. I even have a tough time finding 50 ohm coax that is really exactly 50; /archives//html/Amps/2006-07/msg00489.html (9,043 bytes)
82. Re: [Amps] Transformers (score: 1): Author: Gudguyham@aol.com; Date: Mon, 17 Jul 2006 06:40:55 EDT; Correct, but who uses that measuring stick? Rich, I don't know, but when I was working as a carpenters helper I always got the "dumb end" of that measuring stick. Lou ________________________________; /archives//html/Amps/2006-07/msg00490.html (7,683 bytes)
83. Re: [Amps] transformers (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Mon, 17 Jul 2006 07:00:51 -0400; Recently, at least three manufacturers have taken calibration of their products seriously. I believe Alpha (4510/4520), Array Solutions (PowerMaster), and now Larry Phipps' LP-100 product are calibr; /archives//html/Amps/2006-07/msg00493.html (9,384 bytes)
84. Re: [Amps] transformers (score: 1): Author: Gudguyham@aol.com; Date: Mon, 17 Jul 2006 07:27:07 EDT; I've never seen a pair of 3-500Z's driven with 100 watts produce 1500W PEP **on an accurate power meter** with only 3000V on the anode. It takes about 3400 volts or more to get 1500W out with 100W dr; /archives//html/Amps/2006-07/msg00496.html (8,995 bytes)
85. Re: [Amps] transformers (score: 1): Author: "m.ford" <k1ern@pioneerwireless.net>; Date: Mon, 17 Jul 2006 07:37:58 -0400; The most important thing that I have learned about RF (power) measurements is the the difference between accuracy and precision. Use a meter with a precision scale that is accurate at zero DBM and ma; /archives//html/Amps/2006-07/msg00498.html (12,300 bytes)
86. Re: [Amps] transformers (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Mon, 17 Jul 2006 13:41:28 +0200 (CEST); accurate meters.< Accurate RF power measurement isn't quite as easy as it may sometimes appear. So much so that for European Standards, a measurement uncertainty of +/-0.75dB is allowed. That does i; /archives//html/Amps/2006-07/msg00499.html (9,195 bytes)
87. Re: [Amps] transformers (score: 1): Author: Gudguyham@aol.com; Date: Mon, 17 Jul 2006 07:43:34 EDT; As for PEP. I always felt it was a marketing term. I agree, I am from the old school. Put a brick on the key Lou _______________________________________________ Amps mailing list Amps@contesting.com; /archives//html/Amps/2006-07/msg00500.html (7,526 bytes)
88. Re: [Amps] Transformers (score: 1): Author: R L Measures <r@somis.org>; Date: Mon, 17 Jul 2006 02:49:57 -0700; Correct, but who uses that measuring stick? R L MEASURES, AG6K. 805-386-3734 r@somis.org _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.; /archives//html/Amps/2006-07/msg00504.html (8,523 bytes)
89. Re: [Amps] transformers (score: 1): Author: R L Measures <r@somis.org>; Date: Mon, 17 Jul 2006 04:17:54 -0700; Good points, Tom. However, as I recall, the spec is 5% of F.S. plus 5% of reading, so the accuracy would be +/- 125w plus +/- 75w = +/- 200w for a 1500w measurement. IME, in linear operation, with 30; /archives//html/Amps/2006-07/msg00506.html (10,829 bytes)
90. Re: [Amps] transformers (score: 1): Author: "Mike Schatzberg" <cherokeehillfarm@earthlink.net>; Date: Mon, 17 Jul 2006 08:44:34 -0400; If I were making RF measurements everyday, I would have instruments far better than the Bird 43P and Bird 43 here in my workshop. I would imagine that a modern day manufacturer would also. Although w; /archives//html/Amps/2006-07/msg00507.html (12,449 bytes)
91. Re: [Amps] transformers (score: 1): Author: "John Vickers" <wa4tt@nlamerica.com>; Date: Mon, 17 Jul 2006 09:19:43 -0400; Also, don't forget the feed thru from the driver needs to be deducted. / TT _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/l; /archives//html/Amps/2006-07/msg00508.html (9,702 bytes)
92. Re: [Amps] transformers (score: 1): Author: "John Vickers" <wa4tt@nlamerica.com>; Date: Mon, 17 Jul 2006 09:35:25 -0400; Why no-- you shoulda seen how hard it was when trying to measure brilliance in that string of 300w light bulbs ! :>) _______________________________________________ Amps mailing list Amps@contesting.; /archives//html/Amps/2006-07/msg00510.html (9,757 bytes)
93. Re: [Amps] transformers (score: 1): Author: Gudguyham@aol.com; Date: Mon, 17 Jul 2006 10:00:37 EDT; IME, in linear operation, with 3000vdc it takes c. 140w to drive a pair of 3-500Zs to full throttle. I will whole heartedly agree with that statement!! Lou ___________________________________________; /archives//html/Amps/2006-07/msg00512.html (7,945 bytes)
94. Re: [Amps] transformers (score: 1): Author: Gudguyham@aol.com; Date: Mon, 17 Jul 2006 10:21:14 EDT; The above data is from the AL 80B. I wonder how they manage to measure their RF power output at 1 KW. There are others that seem to rate the output from the modern tube much the same way. I never que; /archives//html/Amps/2006-07/msg00515.html (9,661 bytes)
95. Re: [Amps] transformers (score: 1): Author: "Peter Voelpel" <df3kv@t-online.de>; Date: Mon, 17 Jul 2006 16:41:46 +0200; Why? 1500W out are 1500W. You only deduct the drive power if you want to calculate gain or efficiency. 73 Peter Also, don't forget the feed thru from the driver needs to be deducted. / TT ___________; /archives//html/Amps/2006-07/msg00517.html (9,269 bytes)
96. Re: [Amps] transformers (score: 1): Author: Joe Isabella <n3ji@yahoo.com>; Date: Mon, 17 Jul 2006 07:49:44 -0700 (PDT); I can get nearly 2.5kW PEP output measured on the VFD (predecessor to the WX0B PowerMaster) out of my Henry 3K-A with a pair of 3-500ZGs and almost 4kV on the anodes with 150W+ drive. Do I do that? N; /archives//html/Amps/2006-07/msg00520.html (10,721 bytes)
97. Re: [Amps] transformers (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Mon, 17 Jul 2006 10:16:36 -0500; How else would you measure SSB power if not PEP? 73 Gary K4FMX _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2006-07/msg00522.html (8,873 bytes)
98. Re: [Amps] transformers (score: 1): Author: "John Vickers" <wa4tt@nlamerica.com>; Date: Mon, 17 Jul 2006 12:39:41 -0400; As Rich asked, I was joking, realizing average stations aren't equiped for accurate measures. But since the discussion has gotten to --Max output from a SB220 -- then all measurement tolerances shoul; /archives//html/Amps/2006-07/msg00523.html (9,611 bytes)
99. Re: [Amps] transformers (score: 1): Author: "Will Matney" <craxd1@verizon.net>; Date: Mon, 17 Jul 2006 13:34:35 -0400; Rich, That's right.Another and myself built a two tube driver that would produce 150 watts to drive a pair of 3-500Z's for full throttle.You could vary the drive power anywhere from 75 watts to 150 w; /archives//html/Amps/2006-07/msg00530.html (12,126 bytes)
100. Re: [Amps] transformers (score: 1): Author: "m.ford" <k1ern@pioneerwireless.net>; Date: Mon, 17 Jul 2006 13:47:12 -0400; Hi Gary. Define the term "SSB power". Mike k1ern _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2006-07/msg00533.html (9,695 bytes)

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