Hello David, If a PSK signal is generated in an early stage of a transmitter (or is fed into an input of a transmitter), then all of the transmitter's stages which follow should be "linear" to keep the signal clean. In the case of the basic type of PSK 31.25 signal consisting of a single tone, whose phase is changed by 180 degrees, the change of phase results in sidebands spaced 31.25 kHz each side of the main signal. If the transmitter's stages which follow are not adequately linear, then IMD products could create "splatter".
In the case of solid state linear amplifiers, especially those using a "12 V" DC supply, to prevent poor linearity it is necessary to use a DC supply and interconnecting cables/ connectors which do not allow the supply voltage to "sag" with increasing current draw. I note that you said that there is almost a difference of one volt between 25W and 100W key down. 73, Geoff LX2AO On May 30, 2012 at 3:13 PM, David Moes VE3DVY wrote: > Question, What can cause splatter when using PSK-D I had the power > dialed to 25W so I certainly wasn.t running to much power, and just > to be sure that I was actually using PSK -d I had pulled the audio > line in/out from the K3. Am I missing something? ______________________________________________________________ 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
