----- Original Message ----- From: "Don Wilhelm" <[EMAIL PROTECTED]> To: "Darwin, Keith" <[EMAIL PROTECTED]>; <elecraft@mailman.qth.net> Sent: Wednesday, May 24, 2006 9:29 AM Subject: RE: [Elecraft] K2 power output measurement accuracy? > K2 - all it takes is a known non-reactive 50 ohm load. I use 1% precision > thick film power resistors, so I know my dummy loads are good to 50 MHz or > more, and with these loads, I know the base K2 power indication to be > accurate. > > If you have the basic K2, the power control circuits will adjust the power > to make the RF voltage at the power detector probe equal to that required to > produce the requested power into a 50 ohm load -- but if the load is > different than 50 ohms (as it will be with a 1.2 SWR), then the power > indication will not be correct - tosay how far off it will be requires > knowledge of the resistive and reactive components of the 1.2 SWR (all 1.2 > SWRs are not equal, the range of possibilities form a circle on the Smith > Chart). > > 73, > Don W3FPR ----------------------------------------------------------------------- With my K2 into a DL1, my WM-2 meter shows up to 20 % higher power than my DMM and slide rule indicates. Is the DL1 likely more accurate than my WM-2 meter. If so, I will recalibrate my K2 with the DL1 and DDM. Than I will have a stronger QRP signal and be able to work 300 new countries. I could also recalibrate my WM-2. Also, I wonder if the K2 maximum output power is increased if the voltage goes up. Just in case I need to cheat a little with QRO power (15watts or so). But I promise not to get an amplifyer. 73 (72) Rick Dettinger K7MW
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