My DSL line did exactly the same muting while transmitting on 160 over 300
watts. As it turned out the problem was cured by the phone company. My audio
phone line had always been a little scratchy and had some hum on it. One day it
got really bad so I called the telco. He measured the lines and indeed as
others have pointed out the line was terribly unbalanced and should have been
balanced ( they have specs for that). He chased backwards from my location and
found some bad connections about a half mile away. After fixing the connections
I have had no further problems without any other beads or filtering and 1500
watts on 160 meters. Perhaps one should ask the telco to measure the line first
for anyone having problems.
Lee K7TJR Oregon
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