Amazing eh? Ya gotta wonder if they can hear this themselves, from what i`ve been reading of this thread it (this buzzing interference) sounds like it`s really anoying, curiously, does this happen all the time (constant keyup), or is it just when someone transmits? Intresting. N9NRA
From what I can figure, they do not hear it. When they transmit normally, as they unkey their system, being a tone remote, makes a very unique sound that I have never heard from any other hospital. From my analysis what we are hearing is a buzzing mixed in with that unique unkey.
The buzzing sounds kinda electrical/sparky in nature, so I would venture a guess that there is some kind of interference or similar getting into the wireline between the console and the base location. One other alternative is possibly an electrical failure inside the console itself.
Having seen it with my own eyes and hearing it in use I would say that is a very likely source.
Since it is probably a 2-wire circuit, because it is simplex only, I doubt anything is feeding back down the receive side to the console. On the other hand, if anything is I don't know how they would be able to stand it.
I have never heard this happen from someone transmitting. It just seems like it starts on it's own.