NF raises when TX

  • 1
  • Problem
  • Updated 4 years ago
  • Solved
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.
Photo of Greg


  • 656 Posts
  • 63 Reply Likes

Posted 4 years ago

  • 1
Photo of Steve - N5AC

Steve - N5AC, VP Engineering

  • 1007 Posts
  • 971 Reply Likes
Official Response
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