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## Re: [TenTec] Voltages on 50 ohm Dummy Load

 To: Discussion of Ten-Tec Equipment Re: [TenTec] Voltages on 50 ohm Dummy Load Robert & Linda McGraw K4TAX Discussion of Ten-Tec Equipment Wed, 08 Jun 2005 17:53:47 -0500
 ```I measure the peak to peak value using my scope. Then power equals E squared divided by R. This is good enough for "government work". Looking at it another way: 100 watts across 50.0 ohms produces 70.710 volts and a current of 1.4142 amps. 1500 watts across 50.0 ohm produces 273.8613 volts and a current of 5.477 amps. Another approach, I have a known good RF amp meter that I use with my dummy loads. Comes in handy. Again, This is good enough for "government work". 73 Bob, K4TAX ----- Original Message ----- From: "Williams Barry" To: "Discussion of Ten-Tec Equipment" Sent: Wednesday, June 08, 2005 9:15 AM Subject: [TenTec] Voltages on 50 ohm Dummy Load > Hello All, > > I need to calibrate the watt meters on my Titan, Omni VI+ and 253 Tuner. > I have a Drake 2 kw PEP dummy load and a nice 200 mHz storage scope. In > order to measure output, should I measure RMS, or Peak voltage, (if I > use a sine wave input), and what are the voltages for 100 watts and the > legal limit? > > My guess for a sine wave would be that for 1500 watts PEP out, I should > see a peak voltage of about 274 volts, and 70 volts for 100 watts, if > the dummy load is truly 50 ohms. Is this correct? > > Thanks, > Barry > > > _______________________________________________ > TenTec mailing list > TenTec@contesting.com > http://lists.contesting.com/mailman/listinfo/tentec _______________________________________________ TenTec mailing list TenTec@contesting.com http://lists.contesting.com/mailman/listinfo/tentec ```