--- On Thu, 9/3/09, Don Wilhelm <[email protected]> wrote:
From: Don Wilhelm <[email protected]> Subject: Re: [Elecraft] Tips on setting transmit drive for PSK31 To: "Doug Person" <[email protected]> Cc: "[email protected]" <[email protected]> Date: Thursday, September 3, 2009, 4:06 PM Doug, Do not use the power output as an indication for mic drive on data modes (PSK31 for example). The proper indicator is the "ALC" bargraph - adjust the audio input for 4 bars with an occasional flicker of the 5th bar. At that level, it is not an indication of ALC action nor compression. The ALC does not start until the 5th or 6th bar is illuminated - the lower 4 bars are an indicator of the audio level (sort of like a Vu meter). If you set the audio drive too low, the K3 will attempt to develop more power to maintain the power output level you have chosen - that is the reason things seem so 'touchy'. 73, Don W3FPR Don, I'm curious about your statement that "the K3 will attempt to develop more power to maintain the power output level you have chosen" - Since PSK is an audio driven mode with a varying amplitude component, linearity is very important. What you are suggesting is that the K3 is highly non-linear and has infinite gain, i.e. it puts out X watts regardless of drive. I know that you don't mean that, so could you clarify? Wes N7WS ______________________________________________________________ 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
