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Cw Tx distortion

SA7AKE
SA7AKE Member
edited April 2020 in FLEX-6000 Signature Series
Look at pictures, the TX cw signal looks very wide with distortion. Looks like this in 6, 10 and 17m. Can anyone explain why it looks like this? 73 Jonas SA7AKE image

Answers

  • SA7AKE
    SA7AKE Member
    edited April 2020
    This is 20m, same antennaimage
  • KD0RC
    KD0RC Member, Super Elmer Moderator
    edited April 2020
    It looks like you are zoomed in at different levels.  On 20M you are looking at a few kHz. On the other bands you are looking at tens of kHz. What you are seeing is the keying artifacts.  As an experiment, transmit into a dummy load and watch a string of dots.  Then set the tune power to the same value as transmit power and click the tune button.  You will see far fewer spurs, because a steady carrier has no keying artifacts.  Try with the panadapter zoomed farther out. to see more artifacts.

    73,
    Len, KD0RC
  • KD0RC
    KD0RC Member, Super Elmer Moderator
    edited April 2020
    One thing to be careful of...  I don't know how accurate this display is in showing transmitter spurs.  If you turn on FDX (full duplex) and transmit into a dummy load, you can see how the radio actually hears the transmitted signal.  On my 6400, I don't see any spurs at all even though I have a very similar display to yours when not in FDX.

    Len
  • Mark_WS7M
    Mark_WS7M Member ✭✭✭
    edited April 2020
    Yes the monitored transmit can look really dirty.  Best to use the dummy load method and full duplex.

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