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Higher noise floor with external speaker connected?

WR8F
WR8F Member ✭
edited April 2020 in FLEX-6000 Signature Series
What would cause a higher noise floor on the waterfall when a speaker is connected to PWR SPKR? When I am using PC Audio I have a dramatic improvement. When I switch my speaker from my PC to the radio, the waterfall turns bright green and eventually adjusts to blue again, but signals are not as strong. I have tried using other cables, and I have tried putting snap-on ferrites on the audio cable.

Answers

  • Al K0VM
    Al K0VM Member ✭✭✭
    edited April 2020
  • Stan VA7NF
    Stan VA7NF Member ✭✭✭
    edited April 2020
  • David-N5PSM
    David-N5PSM Member ✭✭
    edited April 2020
  • KD0RC
    KD0RC Member, Super Elmer Moderator
    edited April 2020
  • Stan VA7NF
    Stan VA7NF Member ✭✭✭
    edited April 2020
    I do not have a citation but have experimented.

    All receive input circuits are the difference voltage between the antenna lead and the chassis and one good reason to pull the chassis down to ground.  This does not include the safety ground unless the power supply case is connected to the radio chassis.
  • Tim - W4TME
    Tim - W4TME Administrator, FlexRadio Employee admin
    edited April 2020
    I suspect a ground loop

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