On Tue, 02 Feb 2010 16:34:50 -0500, Don Wilhelm wrote: >BUT one *can* make that happen with incorrect settings.
YES! Don has given us a LOT of great advice in his two recent posts in this thread. Let me emphasize something that I'm sure he understands, but didn't make quite it clear if you didn't read between his lines. NOISE IS PART OF THE SIGNAL THAT IS DRIVING THE AGC. IT IS ALSO PART OF THE SIGNAL THAT IS GENERATING INTERMOD, BOTH AT RF AND AT AUDIO. IT IS PART OF WHAT THE IF SELECTIVITY MUST REJECT, JUST LIKE ANOTHER STATION! CAPS ADDED FOR EMPHASIS. If the NOISE overloads the signal chain, the resulting distortion obscures the signal. It is not enough to keep the signal chain below overload on signal. We must also keep it out of overload by noise pulses. That's not easy, because much of the noise at the antenna terminal is impulsive in nature -- certainly static and stuff like fences. Bear this in mind when setting ATT, PRE, RF gain, and AGC parameters. 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
