- AM carrier is coupling on the ground lines ( Tip and Ground) and then demodulated via the telephone bridge . The following should occur:
- 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 a analog/VOIP service to service the lines through the internet instead of analog lines.