I don't know if anyone here (other than me) does work on School Sound PA System. Recently I had to add six(6) Modular Class Room Speakers to the School System.
Pulled the speaker cables (22/4 Shielded) from the office system to each of the classrooms. This all happened before school started 4 weeks ago. I was just informed that the one room M-105 there was noise of some kind on the Listen.
If you don't know. When the Listen Button is pressed you can hear what the teacher is saying and then when you press the Talk Button the teacher can hear what you are saying. Similar to a basic Intercom System.
Well the sound is a Tikity Tikity Tikity in the background. To make a long story shorter. I think I figured it out today that when I made a splice on the wires I left a 4-5" tail and beanie spliced each wire and then folded the wire inside a metal 4"x4" box with metal cover. In the same closet there is a Security Panel, Fire Panel, and some IT Network Data Switching. The Data Switch has a Cooling Fan and it is making a noise of sorts.
What I ended up doing was to take some Tin Foil and wrapped up the spliced wires and stuffed it back into the box. I know it is early but the Tikity Tikity Tikity has gone away.
At least to MY EARS!!
I am thinking that the fan or something was putting out some RF Noise!! And the wire tails were picking it up and amplifying it to the office. Adding the Tin Foil has blocked the noise and hopefully fixed the issue.
I will know more when staff gets in on Monday...................
Hope you enjoyed the read!!!