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I have the monitor level set to zero, but the radio seems to be hearing itself and there seems to be some sort of noise or interference generated within the radio. If the volume is above 20, it makes a high-pitched screeching sound. It is some thing the radio is doing, not electrical interference because it does it across modes. Across frequencies. Even if you don't have an antenna connected and yes I know you would be very careful not to transmit in such a case.

Have you tried to do a factory reset? That would be my first step, followed by a software reload.

What kind of antenna are you using, and what is the feedline length? Do you need to use the tuner to get a good swr? You may have some common mode current getting back into the radio. The X6100 will do some weird stuff if you are not properly choking the feed line. I choke every cable that attaches to mine. This is a computer they added a radio to, and it is not as robust as far as rf goes compared to a dedicated radio. ABC Always be choking.

Make sure the wires to the internal speaker are routed away from the shield. My radio shreaked with RF after reassembly