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Re: Interesting issue
To: CRTech <crtech@crtech.org>
Subject: Re: Interesting issue
From: JIm Turvaville <jimturbo61@yahoo.com>
Date: Tue, 30 Jan 2018 20:39:44 +0000 (UTC)
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Reply-to: JIm Turvaville <jimturbo61@yahoo.com>

I'm the Media director at our church, we have a Presonus Live 24 with a 100' snake, just no AM stations for 44 miles is all.. LOL

In my experience, finding the issue requires 'slash and burn' troubleshooting. 

I gather you can either hear the AM in headphones or see it on the mixer meters... either way, find some way of confirming you hear it and then start unplugging things one at a time.  As you unplug, leave what you take out disconnected as long as the AM is heard. 

Chris's plan is correct - start with the outputs on the mixer and unplug them one at a time. That would be the monitor returns as well as any main sends that go back to the stage.  My gut says unplugging these will NOT make the AM go away, but it's easiest and quickest to test and eliminate. 

If that does not make it go away, then start unplugging inputs from the mixer one at a time. Start with mic channels or anything coming in that is of low level that would have a preamp in use.  If you find one or more specific inputs that are picking up the AM, then there are ground loop boxes (ART makes some good ones) which can work on a couple of specific inputs or outputs. 

If you get down to the last in put and the AM then goes away, your assertion of the snake being the culprit might be confirmed. In that case, I might suggest that you look at installing or moving the ground from the mixer itself (it IS grounded, is it?) and finding something besides or in addition to electrical ground.  That would usually mean running ground cable to a water pipe, ground rod, etc... not easy nor fun. 

If your entire snake is found to be the source, there are some good 4" or so sized torroids you can get to loop the snake at each end and help kill some RF suspicion. 

None of this process is fast or easy, have a good cup of coffee or energy drink and eat that elephant one bite at a time. 
Jim "Turbo" Turvaville 
SBE Certified Radio Engineer 
Turbo Technical Services 
 PH: 719-459-1859 

From: Joey Alcala <jalcala@calvarymiami.com>
To: CRTech <crtech@crtech.org>
Sent: Tuesday, January 30, 2018 2:31 PM
Subject: Re: [CRTech] Interesting issue

How can we tell?
We think its "into the input channels and going to the console"

We don't think there's any source/instrument picking it up because there's nothing plugged in.

So if we unplug everything from the sound board and are left with only the snake running to a powered monitor on stage the radio station comes in as clear as a bell. So for clarity... We pick it up clearest when we disconnect the sound board from our entire system and just then the monitor on. Our best guess is that the snake is acting as the antenna.

On Tue, Jan 30, 2018 at 3:21 PM, Chris Wygal <cmwygal@gmail.com> wrote:
Can you tell if it's getting into the input channels and going to the console? Or is it getting into the send channels and heading to the stage?

On Tue, Jan 30, 2018 at 3:10 PM, Joey Alcala <jalcala@calvarymiami.com> wrote:
We're picking up 1260 AM (KHz) in our sanctuary, I'm pretty sure through the snake. Any ideas of how to make it stop?

Joey Alcala
God's Way Radio / Psalm 18:30
104.7 FM / WAYG-LP
Find us on Facebook, Instagram,
Twitter, Youtube, and Spotify

Chris Wygal
Audio Concepts <------side gig
Audio Production,Mixing & Mastering

Radio Magazine <-----writing gig

The Journey <------full time gig
Operations Manager


Joey Alcala
God's Way Radio / Psalm 18:30
104.7 FM / WAYG-LP
Find us on Facebook, Instagram,
Twitter, Youtube, and Spotify

References: Interesting issue
(Joey Alcala <jalcala@calvarymiami.com>, 30 Jan 2018 20:10:34 -0000)
Re: Interesting issue
(Chris Wygal <cmwygal@gmail.com>, 30 Jan 2018 20:21:43 -0000)
Re: Interesting issue
(Joey Alcala <jalcala@calvarymiami.com>, 30 Jan 2018 20:30:55 -0000)
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