Usually I can get a SWR null around 10 - 15 mV with the power level at 2W. For some reason I can only adjust it down to around 200 mV into a 50 Ohm dummy load. I have tried changing the diodes and U5 but they did not make a difference. Also rewound T4 using another toroid. Also noticed that when I disconnect the dummy load and transmit at the 2W adj level both FOR and REFL voltages are about the same (TP4 = 1.1Vdc, IC5 pin 7=1.1Vdc)! Shouldn't the VREFL be much higher then the VFWD? Both pots are adj to 27.8 kOhms for power calibration at 2W using a LP-100A. When transmitting 2W into 50 Ohm load (K2 display shows "2.1W 1.4:1") LP-100A shows approx. 2W SWR- 1.05:1 VFWD = 0.822 Vdc (IC5 pin 7) VREFL= 0.173 Vdc (IC5 TP4 ) Why is the K2 showing a much higher SWR then it should be showing? Could there be a problem with U6? I did not build this K2/100 and have found mistakes along the way then trying to get it working properly.... I can't seem to find any in this area yet though! Anyone have an idea what could be the problem? Thanks, Michael n2zdb ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected]
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