Has anybody the schematics for the HM234 or HM173? I am having trouble connecting my ICOM A6E aviation transceiver to a generic noise cancelling speakerphone. I use the A6E as emergency transceiver in an aircraft. The schematics seems to be unortodox due to separate ground for headphone and microphone. I am not able to avoid HF interference.
Comments
Hello!
The factory ICOM speaker microphone also has a separate GND wire has both the microphone and the speaker side. The connected device must also be wired in the same way, because of the ground loop and disturbances.
Regards: Tony
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Hi Tony and thank you for replying. I use the shielded pair of the spiralcord for the MIC LIVE and the shield connects to mic ground. The speakers two leads are floating. Here is a schematics of the transceivers speakerphone connectors.
ICOM IC A6E
Speakerphone problem
Mic and speaker connectors
Best regards
Bengt SM6FBY
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