I found time to run a few 2 tone IMD tests with my K3 and KPA500 combination today, these were on 80m using a 50 Ohm Cantenna load with the spectrum measurements taken with a Microtelecom Perseus SDR. The SDR receiver was coupled via a loop of wire around the coax to the Cantenna. The two tones used in the test are from the internal 2 tone generator in the K3.
First the K3 running at 20 Watts, the approximate power level used to drive the KPA500 to 400 Watts output: http://www.astromag.co.uk/images/K3_2tone_20W.jpg Secondly the K3/KPA500 running 400 Watts: http://www.astromag.co.uk/images/KPA500_2tone_400W.jpg Thirdly, the K3 running 100 Watts output with a spoken "four" into the microphone: http://www.astromag.co.uk/images/K3_voice_100W.jpg Finally, the K3/KPA500 running 400 Watts with a "four" as above: http://www.astromag.co.uk/images/KPA500_voice_400W.jpg Anyone got similar plots they would like to share? 73 Dave ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
