I am hearing AM radio voices coming through the telephone lines?

Why is this happening?

The AM carrier is coupling on the ground lines (Tip and Ground) and then demodulated via the telephone bridge. This causes the unexpected AM radio voices.

You can attempt to fix this issue by following the steps below:

  • Verify that board has the current board revision (Mircom installed a notch filter removing the prominent carrier wave). If the board is not of current Revision, change out the board; or
  • Install an isolation telephone line transformer between the board’s ground and telephone line. Ensure that no other grounds are connected to the board and that the casing is not connected the Telephone’s metal casing; or
  • Use an analog/VoIP service to service the lines through the internet instead of analog lines.

Please contact technical support directly if you are still experiencing this issue after attempting the above.


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