Radio Signals in my System.

[SweetBennyFenton]

All you sound-savy people were such a help last time, I thought I would run something else past you.

The sound system in my theater has the nasty habit of picking up radio signals. I've done what I know of to minimise this, but even so when the system is powered up you can still hear the faint sounds of mariachi music in every speaker.

Has anyone else had this problem? Do you think it's a problem with the microphone or cable that I use as a stage monitor? Any ideas?

Thanks again...

[avkid]

Are the cables to your amplifiers balanced or unbalanced?

[jwl868]

We had a similar problem at our church. (see this thread for the replies)

http://www.controlbooth.com/forums/s...broadcast.html

Shortly after that, a couple choir members tracked down the problem. I can't remember the details, but I there were some long, maybe duplicated runs of cable from the main PA in the front of the church and some another component in the balcony. They eliminated the extraneous run of cable (or maybe got lucky and eliminated a bad cable) and that was the last we heard of the radio.

Joe

[KProductions]

My guess is bad cables somewhere in the chain.

[SweetBennyFenton]

Thanks for linking me to the other thread. I searched for a thread on this before I posted, but I didn't come across that one.

This gives me some good ideas. Thank you.

[BillESC]

Balanced cables are your friend.

[museav]

"Divide and conquer." The more you can narrow down where it is being introduced into the system, the easier to find the cause and a solution. Plug and unplug cables, adjust volume controls, etc. to see if you can isolate the problem to any particular device or cable paths. Also, knowing some details on the system might help, for example some older Mackie mixers were susceptible to RF on their inputs, for which Mackie introduced a fix that was incorporated into later models.

[Van]

The Portland Area is so Innudated by High Power RF it's not too surprizing to get radio on a PA.
You're gonna have to go over everything that is pre amplifier. My money is on it being the last cable you check.


Often an unsoldered sheild or ground wire, or a messy one < with wires sticking out all over, ( course those are kinda obvious) , tend to be the culprits. >

[SweetBennyFenton]

Originally Posted by Van

The Portland Area is so Innudated by High Power RF it's not too surprizing to get radio on a PA.
You're gonna have to go over everything that is pre amplifier. My money is on it being the last cable you check.


Often an unsoldered sheild or ground wire, or a messy one < with wires sticking out all over, ( course those are kinda obvious) , tend to be the culprits. >

Yeah... and the in-wall wires seem to have been run by a monkey on speed. I have some good clues as to the problem now.

I will kinda miss the mariachi music though.

[TimmyP1955]

Listen to the noise on the console's headphone output. Starting with the local line level sources, disconnect console inputs until the noise goes away. If it does not, start disconnecting outputs.