Guys...HELP!!! I am having trouble with my KX3 and mode PSK D (PSK31). When I attempt to use the KX3 only to generate PSK31 signals (that is no computer interface…strictly the KX3 with the iambic paddle), I either do not get any measurable RF output or, I do not get any stable RF output.
Setting the KX3 to mode PSK D and setting RF power to 5 or 10 watts and attempting to initiate a PSK31 transmission with iambic paddles, the KX3 initially shows a quick RF power indication that immediately drops to 1 bar indicated on the KX3 meter (should show 5 bars or 10 bars depending on the power setting). The no RF power output condition is verified using an inline peak reading wattmeter attached to a 50 ohm dummy load. I can see the initial RF power spike that drops to 0 watts on the external wattmeter. Even though there is no power indicated, I can hear weak PSK31 audio being generated when listening with a secondary receiver (ICOM R75) tuned to the KX3 transmit frequency. Adjusting the RF power knob while in PSK D transmit mode (sending the letter “e” with the iambic paddle every 2 seconds) the KX3 will eventually show some RF power being generated but RF power does not appear stable. Power indicated on the KX3 and power indicated on the external wattmeter does not match the RF power setting of the KX3. Listening to the KX3’s signal with the ICOM receiver shows the same erratic power output (no S meter reading that jumps to S9+20 when dialing the power DOWN on the KX3). Pops and clicks can be also be heard on the ICOM when adjusting the power knob of the KX3. Here is the kicker…all other modes on the KX3 appear to work normally,/ including the internally generated FSK D mode/. Setting the KX3 to mode FSK D and initiating a transmission using the iambic paddles shows /stable/ RF output that matches the KX3’s RF power setting. Adjusting the RF power while in FSK D transmit shows smooth power progression from 0.1 watts to 12 watts and no audible clicks or pops are heard in the ICOM. I was using 1.54 firmware but I’ve dialed back to the 1.48 official firmware with no improvement. I have also bypassed the internal ATU with no improvement. Is there any additional testing that anyone can think of before I send an email to the service department? 73, Dave N5XL -- View this message in context: http://elecraft.365791.n2.nabble.com/KX3-mode-PSK-D-problem-tp7577830.html Sent from the Elecraft mailing list archive at Nabble.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
