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NF raises when TX

Greg
Greg Member ✭✭
edited February 2017 in SmartSDR for Windows
When transmitting on 10M this evening trying to work FT5ZM the entire NF jumps from about -128 dB up to -70 while transmitting with multiple vertical lines throughout the display.

Comments

  • Steve-N5AC
    Steve-N5AC Community Manager admin
    edited February 2017
    With the preamp on you are overloading the receiver.  You can either:

    1. Turn off the preamp
    2. Listen using a different antenna (RX/TX on different antennas for isolation)
    3. Just understand that the signal will overload the receiver when in transmit with the preamp on

    Steve
  • Greg
    Greg Member ✭✭
    edited February 2014
    Thanks Steve.  Preamp is pretty necessary on 10M otherwise its pretty deaf  here.  And I need the gain for DX from my 10M yagi so the one antenna is needed on both TX/RX.  Is the overload and danger to the receiver?

    Since what we see on the panadapter is not really an accurate picture of that is being transmitted I wish there was a way to switch that off alltogether or to add x amount of attenuation to the receiver during transmit.  I had an ANAN for a couple weeks waiting for the flex to get here and that is one of the things they had in their software that seemed to work reasonably well.

    Tnx
    Greg

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