Yes I think your game-plan is sound Lenny

The demodulation of the AM carrier may not be happening within the modem, it
might be happening within a telephone or other device connected to the line,
even while that device is 'on hook', so start by disconnecting everything
except the modem.

Also try another modem.

You might like to try a filter designed for use with DSL installations, I
should imagine these would also be good for rejecting external AM
transmissions.




--
Graham.



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