After staring at Knut's KIO3B spectrum with an XG3 signal source, I am wondering how much of that spectrum can be attributed to the KIO3B and how much is due to the K3S RF chain and XG3 phase noise and harmonics.
I tried a different approach with my K3 and DigiKeyer keeping everything at AF and avoiding the RF and XG3 related variables - I think. I sent the K3 a 1 kHz test tone to LINE IN while the K3 was keyed in TX TEST mode. At the same time an instance of Spectrum Lab analyzed the return audio (i.e. the monitor audio returned over LINE OUT). The resulting spectrum lacks the significant harmonics Knut observed although I show some AC spectra (fundamental + 3rd, 5th and 7th harmonics) which might be attributable to my DigiKeyer sitting directly above the KPA500's transformer. <http://elecraft.365791.n2.nabble.com/file/n7612159/1_kHz_test_tone.png> Is analaysis of recovered transmit audio while in TX TEST a viable way to eliminate the RF and XG3 related variables or have I missed something? If it is viable, I would be interested in the same being done with a KIO3B for comparison purposes. 73, Dan AE9K -- View this message in context: http://elecraft.365791.n2.nabble.com/K3IOB-tp7611605p7612159.html Sent from the Elecraft mailing list archive at Nabble.com. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
