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FT8 Transmit Signals on 12 Meters and 160 Meters

Mark Griffin
Mark Griffin Member ✭✭✭
in FLEX-8000 Signature Series

Guy,

Please look at the following pictures for my Transmit Signal on both 12 Meters and 160 Meters. The only difference is that with the 160 Meter Signal I am using my Receive Antenna versus the Transmit Antenna for receive on 12 meters.

12 Meter FT8.jpg 160 Meter FT8.jpg

Am I getting some time of RF or something that would cause the 160 Meter transmit signal to be so different?

Mark KB3Z

Comments

  • johnn1jm
    johnn1jm Member ✭✭✭

    Have you tried to reduce your transmit DAX? I'm not sure looking at your transmit signal that way is an accurate representation of the signal.

  • Mark Griffin
    Mark Griffin Member ✭✭✭

    I will have to try that and see what happens.

    Mark KB3Z

  • Geoff AB6BT
    Geoff AB6BT Member ✭✭✭

    Are the scales on the right side of the window the same? You don't show them in your photos.

  • Mark Griffin
    Mark Griffin Member ✭✭✭

    I will have to take a look at the Geoff!

  • Mike-VA3MW
    Mike-VA3MW Administrator, FlexRadio Employee, Community Manager, Super Elmer, Moderator admin

    That is 'fake news' so to speak. :)

    Your RX antenna RXA and that is external to band pass filters. This is normal.

  • John KB4DU
    John KB4DU Member ✭✭✭✭

    This a common confusion point. Part of it is that the pan pick up “bleedover” from the transmitter to display. The displayed signal is before the final filtering. The actual transmission doesn’t have all those peaks.

  • Ken Wells
    Ken Wells Community Manager admin

    The OP's Pictures did not show the full screen, so it is impossible to tell how much RF Preamp is applied on 160 Meters. Nor what the setting for WNB is. Both of these settings can affect the "bleedover" issue on the panadapter while transmitting.

    In any case, anything outside the normal TX Filter bandwidth is only "Phantom" signals on the panadapter, which are filtered out before hitting the actual transmit amp and antenna.

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