On Mon,11/10/2014 4:59 PM, [email protected] wrote:
Full linearity is needed for these modes to keep IMD under control.
Huh? "Full linearity" would be zero distortion. ALL amplifiers have some amplitude distortion. See ARRL test results for a sample of current products. 2-tone IMD in the range of -30dB is pretty common.
In the link I just posted, look at the occupied bandwidth of the K3 driving a KPA500 to full power, and to a few dB less power, then compare to the K3 driving a triode tube amp to legal limit. The IMD sidedbands are clearly visible, even with a CW signal -- remember that a CW signal is a carrier amplitude modulated by a square wave. The square wave has harmonic content (as a function of its rise time and shaping), so it produces IM.
73, Jim K9YC ______________________________________________________________ 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 Message delivered to [email protected]
