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Reports of signal fading during a QSO.

Thurman IrvingThurman Irving Member
  I have a new-to-me Flex 6500 and have received several comments about my signal fading during a QSO.  The PowerSDR RF power meter shows a constant power during the QSO.  How can I determine if the radio is working correctly?  I have a limited period to request correction from the seller.

The radio is Flex 6500 SN 0316-5064-6500-8299.  HW version is v3.1.7.138 with options None.  Software is SmartSDR 3.17.  PS is Astron RS-35M.  I am using a Dell SPS 8700 16GB with Win10.  I am also using FLDIGI 4.1.08.

Thurman Irving N5SI


  • Mark_WS7MMark_WS7M Member ✭✭
    edited October 2019

    Are you sure its simply not the band conditions?  They are not great these days and QSB is a very real thing in most QSOs
  • Neil D Friedman N3DFNeil D Friedman N3DF Member ✭✭
    edited October 2019
    Band, time of day and location for each fading contact?
  • Dean DavidsonDean Davidson Member ✭✭
    edited October 2019
    You need a meter between antenna and radio to determine if your power is dropping while talking . Dont ever depend on just the meter on the radio. What mic are you using?
  • Bill W2PKYBill W2PKY Member ✭✭
    edited October 2019
    External power meter will put your concerns to rest.
    Borrow one from a friend if you do not have one.
  • Dean DavidsonDean Davidson Member ✭✭
    edited October 2019
    NEIL has a good point Band conditions are not real good here lately.
  • Mike-VA3MWMike-VA3MW FlexRadio Employee, Community Manager admin
    edited October 2019

    The only way to test this is to watch the RF power out with a calibrated watt meter and a good dummy load.    Band conditions and possible antenna health can contribute to signal reports like you are hearing.

    Another data point would be to have a local (meaning 5 miles or so) listen to you.  But, again, it would be subject to the above test if they also heard a signal fade.

    My other comment is that could it be your mic position when compared to your mouth?  Long QSO's can result and the mic moving further away from your mouth.

    Those are just some ideas.


  • WW1SS - SteveWW1SS - Steve Member ✭✭
    edited April 10
    There has been lots of QSB on signals lately. Band conditions are horrible.
  • Paul - K6HRPaul - K6HR Member
    edited October 2019
    You might also consider listening to your signal via one of the remote receivers on the internet and see if it's just conditions. Let us know how it performs on the dummy load.
  • Neal Pollack, N6YFMNeal Pollack, N6YFM Member ✭✭
    edited October 2019
    Band Conditions? I have not seen anything lately that resembles usable band conditions. Try talking with someone in your local area, like 5 to 7 miles away. Else, launch a kickstarter go fund me campaign, and buy us some sunspots....
  • Bob  N0ISBob N0IS Member
    edited October 2019


    A monitor scope in the transmit line will always let you know what it going on with your transmit signal.

    Bob, N0IS

  • David Decoons, wo2xDavid Decoons, wo2x Member ✭✭✭
    edited June 11
    One other thing to check is if the processor is on or not. Recommended to have processor on and in normal setting. This will help keep tx level more consistent.

    Dave wo2x
  • k3Timk3Tim Member ✭✭
    edited May 23
    To monitor your output RF strength, a low-tech solutions is a field strength meter using a 1N34A diode, some caps and a VTVM for read out.

    Tim - k3Tim

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