Micha, The signal paths for TUNE and CW transmit are the same from the MCU outward.
However, I recently repaired a K2 with the same problem. The problem was traced (using a spectrum analyzer) to RF Board U4 in that particular case.
However, your problem could be different - look at the keying waveshape components first (Control Board U10A and Q8) as well as the PLL Reference Oscillator.
73, Don W3FPR On 10/27/2017 2:47 AM, Micha DF4WX wrote:
Dear community I am having problems with my K2. I got complaints about a lousy signal (e.g. rst 591). When I checked my signal with an external RX I heard a kind of a noise instead of a clean CW signal. When I press the "Tune" button, I have a very clear tone (as usual) in the control-RX. With all power levels the PA current is the same both in tune and in normal CW TX-mode. Only the resulting signal is different. What could be the root cause of this issue? Are the signal paths of CW-TX and tune different to each other?
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