all the horns on our paging are producing "ticking" or "clicking" noise every 3. second. As soon as I power off the ampliefier, the noise stops, obviously. The paging gets recorded by DFT120 from Bogen. I have tried it to power off DFT120 with no results.
Any idea what could it cause the noise?

Paul

Is there any possibility that a security system or the like be cross connected to a speaker cable??
When did this start?? Was there some work done somewhere to cause this?

Sounds like it may be picking up a polling loop from a digital fire alarm.
Disconnect the input to the amp to see if it's being induced from the source.
---------------------------------
MrG

How long is the wire to the input to the amp, what kind is it and where is it run? What amplifier are you using? Give us and idea what this looks like from the paging source (phone system?) to speakers.

-Hal

Has this always occurred from day 1, or has paging been in place and just started with the clicking?

Thanks very much for all comments.
Actually, it stopped. I am still don't know what it cause. Yes, I did disconnect the source, the noise was still there.
May be our TOA amp is slowly dying.

Sure it wasn't your cell phone?

-Hal

pland,
Hal was not joking - cell phones, cordless phones, PDA's, and all manner of other little wireless gadgets can emit little "blips" of handshaking/location/ID info, even when just sitting idle (especially when just sitting idle). These little bursts of RF can find their way into the audio of even the best equipment when they are strong enough. And of course, these things are tiny and hiding in people's pockets, so they come and go...

Jim
**************************************************
Hiding from RF noise in a secure undisclosed location.