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Maestro MIC2 audio AC noise

EC5W Member ✭✭
edited April 2020 in Maestro


 I have a problem with Maestro MIC2, not its possible transmit without high noise, such AC power, I tested dynamic microphone, electret capsule, Trust quasar headset, Heil Sound Proset Elite, Heil Sound Pro7, with and without BIAS all with same result. Also I removed the AC switched power supply using a linear power supply. It is possible that I have a hardware problem on Maestro?

 https://vocaroo.com/i/s15MsA7A5DbR I attach audio sample of noise.

Thanks in advantage, Miguel EA5GF


  • Mike-VA3MW
    Mike-VA3MW Administrator, FlexRadio Employee, Community Manager, Super Elmer, Moderator admin
    edited April 2019
    Hi Miguel Please open a support case. Mike
  • Steven WA8Y
    Steven WA8Y Member ✭✭
    edited January 2019
    It might be because of the mic jack plug wiring. The mic plug must have a TRS plug (Tip Ring Sleeve).
  • Howard AE3T
    Howard AE3T Member
    edited June 2019
    I have exactly the same noise problem using any mic plugged into the Maestro. It is worse with the flex FHM-2 mic. Any suggestions?
    Howard AE3T
  • EC5W
    EC5W Member ✭✭
    edited June 2019

    I send finally to Flex EU service, after change the display and back to my home have the same problem:-(  Arrived from factory with this problem, tested with two Flex radios and MIC1 input. I will ask the seller to return the money or change it for a new one, It is a manufacturing defect and I could not use my new Maestro after two months.

  • [Deleted User]
    edited April 2020
    Sounds like either a wiring issue or bias maybe on when it needs to be off or visa versa. My RS 55 headset works fine here
  • EC5W
    EC5W Member ✭✭
    edited June 2019
    Wow tested with power bank without any PSU and no more noise! :-)
  • EC5W
    EC5W Member ✭✭
    edited February 2019
    Try change Power supply by another.

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