And 1.5 watts, through a decent antenna system, now becomes the equivalent of a nice QRP station - covering up that DX station, when propagation is right, that you were trying to work. Those of you with P3s shave probably already seen it in your waterfalls - "walls of noise" up to 9/10 kHz wide. Those that haven't should; it's a real eye-opener.
Mike Alexander - N8MSA [email protected] ----- Original Message ----- From: "Jim Brown" <[email protected]> To: [email protected] Sent: Tuesday, July 2, 2013 3:06:36 PM Subject: Re: [Elecraft] [TenTec] Tx IMD and Purity On 7/2/2013 11:10 AM, george fritkin wrote: > Nobody can even hear -30 distortion products. WRONG! 30 dB down from 1.5kW is 1.5 watts. If that 1.5 watts is your neighbor a few miles away, he's 30 dB over S9 and the trash is on top of the S9 station you're trying to copy, you damn well WILL hear it, and you'll be thinking about putting pins in his coax if he doesn't clean it up. While I agree that AUDIO distortion IN THE PASSBAND at 30dB down does not matter, the SPLATTER it produces matters a LOT. And that's for ham radio. If you're listening to acoustic music and you're not deaf, you CAN hear some kinds of distortion products in the -60dB range, depending on the nature of the distortion. 73, Jim K9YC Fellow, Audio Engineering Society ______________________________________________________________ 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 ______________________________________________________________ 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
