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Author Topic: Multiple antennas + WL mics  (Read 2242 times)

Kellen Tyburski

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    • Kellen Tyburski | Audio Engineering
Re: Multiple antennas + WL mics
« Reply #10 on: November 23, 2012, 08:47:01 pm »

I did have one more question I was hoping you guys could shine some light on for me.

Right when the first speaker went on stage I experienced some static on his mic that I am convinced came from an RF issue. I have heard this sound before when using WL mics.. Best way I can describe it is "static", similar to the sound you would get if you were using a transistor radio to cut through different stations.

I chopped the piece out of the recording so you guys could hear.

http://www.kellent.biz/drops/static_recording.mp3

The sound in questions comes in right at the beginning, @ 13s, 23s, and 54s. It's best heard with a pair of cans on. In the room it wasn't loud, but enough for me to prep a backup lav in case it became worse. The lav was not rubbing against the speakers clothes...
the RF meters on the receiver were locked solid, so were all other 15 in use.. According to WL workbench all frequencies were spaced properly, etc. This particular mic was the only one that had this issue the entire time, luckily he only spoke for about 5-6 mins in the beginning.

Any ideas on what this could be?? 
« Last Edit: November 23, 2012, 08:57:41 pm by Kellen Tyburski »
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KT

Jerome Malsack

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Re: Multiple antennas + WL mics
« Reply #11 on: December 28, 2012, 12:24:26 pm »

Yes but do the receivers need to be at FOH? 

Could you use a snake to take the receivers behind the screen and leave the antennas in a location to hide and better support the room. 

I plan to place my antennas this way for a future conference that I had trouble with an Airport Radar sweeping the antennas and killing the signal.  by using 20 foot cables to the antennas I have a 40 foot wide span so the radar sweep will kill one antenna at a time that way I have signal all the time. 
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Henry Cohen

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Re: Multiple antennas + WL mics
« Reply #12 on: December 29, 2012, 01:26:18 pm »

Yes but do the receivers need to be at FOH? 

Could you use a snake to take the receivers behind the screen and leave the antennas in a location to hide and better support the room. 

I plan to place my antennas this way for a future conference that I had trouble with an Airport Radar sweeping the antennas and killing the signal.  by using 20 foot cables to the antennas I have a 40 foot wide span so the radar sweep will kill one antenna at a time that way I have signal all the time.

Are you using active antennas?
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Henry Cohen

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Pete Erskine

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Re: Multiple antennas + WL mics
« Reply #13 on: December 29, 2012, 02:40:23 pm »

I did have one more question I was hoping you guys could shine some light on for me.

Right when the first speaker went on stage I experienced some static on his mic that I am convinced came from an RF issue.

With the TX off, do your RX show any RF?  If so find another freq for those.  If you are using active antennas and your antenna cable is low loss like LMR400 or RG8, set their gain on 3db.  10 db tends to just raise the noise floor.

Do yu have a SA?  What does the freq look like when TX is off?
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Kellen Tyburski

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    • Kellen Tyburski | Audio Engineering
Re: Multiple antennas + WL mics
« Reply #14 on: January 23, 2013, 11:34:42 am »

With the TX off, do your RX show any RF?  If so find another freq for those.  If you are using active antennas and your antenna cable is low loss like LMR400 or RG8, set their gain on 3db.  10 db tends to just raise the noise floor.

Do yu have a SA?  What does the freq look like when TX is off?

Hey Pete,
When TX is off, no RF showed on any receivers. Gain on both active antenna's was set @ 3dB.
And you will have to forgive but what does SA stand for?
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Mac Kerr

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Re: Multiple antennas + WL mics
« Reply #15 on: January 23, 2013, 11:49:23 am »

And you will have to forgive but what does SA stand for?

Spectrum Analyzer, like This One.

Mac

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Kellen Tyburski

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    • Kellen Tyburski | Audio Engineering
Re: Multiple antennas + WL mics
« Reply #16 on: January 23, 2013, 12:01:16 pm »

Spectrum Analyzer, like This One.

Mac

Ok- Pete - No SA  was used :)

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KT
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