3 comments for “Elecraft KPA-500 video overview

  1. wa1rwn-John
    December 6, 2011 at 2:11 am

    Love that KPA500 :-),,, Would like to see a Real Time Spectrum Scope without the shadow behind it

  2. N4FBW-Rick
    December 9, 2011 at 12:23 am

    Thanks for posting the video of the KPA-500. I got to speak with the designer of the KPA-500 at Pacificon. He worked very hard at designing it to avoid the problems that occur in other solid state amps. I’ve seen pictures of the inside of the KPA-500 and the construction quality is as good as the THP amps. The KPA-500 isn’t inexpensive but you get what you pay for, especially in solid state amps. I plan on purchasing one of these amps in the future!

  3. December 9, 2011 at 8:08 am

    Thanks for the comments.

    G4AON recently made the following measurements:

    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

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