RF in the shack!

[KA9MOT]

Seriously, I'm guessing it's a bad engineering job on the DSL modem. Poor RF shielding is the usual suspect when it comes to RFI with consumer electronic equipment.

I think you are correct. I just can't get my head around how RF is getting to it. That dummy load might be radiating a little, but not much.

[W3WN]

I think you are correct. I just can't get my head around how RF is getting to it. That dummy load might be radiating a little, but not much.

You'd be surprised at how well a dummy load can radiate. I can still remember the night when N3WS checked into the WPA traffic net with an extremely weak signal, which had those of us in the K3CR shack scratching our heads (Walt lived a couple of miles from campus, so he should have been booming in). Turned out he was still on the Cantenna.

If the internet modem/device has a plastic case, and most of them do, there's very little to keep the RF out.

And try a ferrite bead or filter on the AC power cord. You'd be surprised at how well those can be as antennas sometimes.