Bruce, I think that, with the sensor on the 100 Watt power amplifier the power is measured. Without the PA sensor, it is a relative power.
Mike - AA8K Bruce Walker wrote:
I have an SDR-1000 from which I recently removed the 100WPA, so it's now a barefoot 1W version. I am currently using an FA-66 with it. I've noticed that since I've removed the 100WPA, the displayed power is about 3dB higher than what I read on my QRP power meter (WM-1); when PowerSDR says 1W out, I'm measuring 500mW, and that holds with scale (100mW displayed, 50mW measured). Most of my operation is QRPp, and my WM-1 has seemed accurate: it matches up at 10W with another meter and matched PowerSdr indications with the SDR-1000 PA at 1-10W, and it scales appropriately with attenuation. I wanted to verify the sound card output calibration using the Sound Card Output Voltage test in PowerSDR, but when I remove the line out plug from the back of the SDR-1000 and click on the Test button, there is *no* voltage on the line out plug (I expected to sanity check the ~2.27VAC default for the FA-66). A Tune at PowerSDR==1W yields 0.82VAC on line out, but not sure what that should be. My tests have been on 30m into a dummy load. --bruce W1BW
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