What is "SSB+CW mode"? 73, Josh W6XU
Sent from my mobile device > On May 28, 2018, at 9:44 AM, Dan Maase via Elecraft > <elecraft@mailman.qth.net> wrote: > > > I have just attempted the K3 SSB +CW configuration for the first time. > Unfortunately, behavior is not quite as expected; I experience a > substantial CW carrier overshoot on first key press and after a subsequent > mode change. (Mode change can be a band change or an Operate/Standby > change when running with the KPA500). > > The overshoot is on the order of 10 to 40% depending on the power level > setting. > > When running the K3 barefoot at 100 watts the overshoot is on the order of > 110 watts measured with a W2 in peak reading mode. > > When running the KPA500 set for 500 watts (approx 27 watts drive), the KPA > output overshoot has been observed to exceed 700 watts triggering a high > power fault. The only recourse is to reduce drive setting to the KPA500 to > an output level of 400 watts or so where the output power overshoots to on > the order of 550 watts. > > Holding down the key after the overshoot, the power settles to the selected > value in a second or so (assuming KPA power is set such that no fault > occurs). > > Subsequent CW key presses produce power output at the selected value without > overshoot, regardless of momentary or continuous key press. > > Also observed is difficulty setting power on key down, particularly with the > KPA500. Power setting is "jumpy" when changing power, after the overshoot > has stabilized. It seems as if when increasing power, it overshoots the set > value, then drops to the set value. > > The issue is observed on all bands and on upper or lower sideband. > > I've performed TX Power Calibrate several times with reported success, but > no change in overshoot behavior. > > When in normal CW mode, there is no overshoot and the power adjustment is > smooth and stable. > > The SSB +CW mode would be quite useful if it was stable, but I am uneasy > using it as currently implemented. Any comments or ideas are welcome. > > K3 is S/N 4457 > Firmware version is 5.62 > FPF 1.26 > DSP 2.88 > > 73, > Dan AC6DM > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to j...@voodoolab.com ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
