With the voice command configuration out of the way, I started to look into the noise in the intercom. I was pretty sure it was one of the LRU with an antenna, so I used the VP-X to turn on and off the suspects. It was pretty easy to identify the GTX 45R, it makes sense as this is the only one transmitting. Now I just have to figure out if it is due to the antenna proximity (everything is located on the workbench for now) or something else.