On Fri, 08 Aug 2008 21:56:41 +0200, Alexandr Kobranov wrote: >last test to test possible AGC influence on ghost signals is here
When you turn off the AGC, you are likely to overload the audio system in any radio. The trace below is nothing more of less than harmonic distortion caused by the overload of an audio stage. Could be the K3, could be the sound card. http://www.ok1kei.org/K3_audio/line_out_agc_off_500Hz.JPG >Without changing of soundcard input gain the same performed with >TS-850 >http://www.ok1kei.org/K3_audio/ts850_agc_off.JPG The second trace shows that the audio system is not being overdriven. The difference could be nothing more than how levels are set or how much gain there is between the detector and the audio system. You've excited the audio system with a single frequency. If you excited it with broadband noise, as I did, you would also see the IM components of distortion. 73, Jim Brown K9YC _______________________________________________ Elecraft mailing list Post to: [email protected] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
