[AMRadio] Audio Warble?


Bow kd5kzn at sbcglobal.net
Fri Sep 14 04:46:12 EDT 2007


Steven,

Thanks for the reply.

It seems that I am getting this warble even with nothing on except the
Phantom power on the VX-2000, and the EQ, UltraFlex and Compressor turned
off.

I even get it using a dynamic mic (Shure SM-57) instead of the condenser...

I wonder if my VX-2000 is heading south?

Bow

W5EFR


-----Original Message-----
From: amradio-bounces at mailman.qth.net
[mailto:amradio-bounces at mailman.qth.net] On Behalf Of Stevan A. White
Sent: Thursday, September 13, 2007 00:13
To: AM Radio Mail List
Subject: Re: [AMRadio] Audio Warble?

I listened to your audio clip.  It really sounds to me like all your FX
units are fighting each other to some degree.  Example:  I can tell you have
a fair amount of de-essing set on your VX2000, you also have a good amount
of high-mid and high EQ set on your PEQ-2200.  This in itself creates a
small amount of compression in those frequency ranges as they oppose each
other in the different units.  This also muddies up the sound as one unit
tries to cancel the effects of the other.  The complete opposite of what you
wanted to achieve, no doubt.  Then there's the matter of the EX-3200 AND the
Alesis Compressor.  They pretty much duplicate the stages included in your
mic processor.

I've been a broadcast engineer for more than half my life and I've set up a
lot of audio processing for production studios, FM transmitters, and AM
transmitters.  The best way to set ANY processing is one step at a time.
Follow the manufacturer's suggested starting points.  I'm actually a
Behringer fan and have used quite a bit of Behringer equipment.  Most
everyone that bad-mouths Behringer does it out of ignorance.  They haven't
read the book.  Behringer stuff will do an outstanding job for you IF you
read the book first.  They made the stuff, they can sure tell you how to
make it work.  Same goes with anybody else's products.  See what they say
and then experiment on your own from there.

So, follow the book's recommendations for basic setup and then spend a while
fine-tuning each parameter.  When you are satisfied with your mic proc,
sparingly add one of the other units and play with it for a while.  I'm
betting you won't be able to improve things much over what you get with your
mic proc since it is an "all-in-one" processor.  The "warble" you mentioned
is introduced early on in the mic proc.  If you follow the book's
recommendations and still get no satisfaction, yank it out altogether and
use just your mixer and your compressor by themselves.  It may be that the
mic proc has a problem.  Whatever you do, resist the urge to cascade the two
sides of your stereo units.  
Also, the surround proc setting will be of no use since you're not
processing a stereo signal.  It will introduce some funky junk you won't
like.

Add stages only if they produce a desirable result.  Otherwise leave them
out altogether.  Less IS more.  Really!  Let us know what you discover.

Best Regards,
Stevan A. White, W5SAW
SW Commercial Electronics
928 South Crockett Street
Amarillo, Texas 79102
Phone 806-681-7228
w5saw at pathwayz.com

"Our five senses are incomplete without the sixth -- a sense of humor." 
-- Source Unknown



Bow wrote:
> OK.. I was playing around with my Icom IC-718 and the audio setup that 
> I normally run for SSB.
>
> I was playing around with AM, because I have never used it for AM 
> before, and recording the audio, because someone on an internet forum 
> actually said the outboard processing is a waste on AM... (HUH?!?!?)
>
> Any way, I noticed this warble in the audio... Anyone have an idea of 
> what it is?
> I'm running:
>
> MXL V57M Condenser Mic
> Behringer VX2000 Mic Preamp
> Behringer PEQ-2200 5 Band Parametric EQ Behringer EX-3200 Ultrafex Pro 
> Alesis Compressor Behringer Mixer Then to the transmitter.
>
> The audio is injected through the ACC jack in the rear of the radio.
>
> >From just the Mic and Transmitter to the full rack, turned on 
> >one-by-one
>
> http://www.riley-music.com/BowsStuff/BlackFace/718AMRackSample.mp3
>
> The power setting was on the lowest setting and I was transmitting 
> into a dummy load. The warble was also there on a low power on-Air 
> check... But not while using SSB mode.
>
> Help?
>
> Bow
>
> W5EFR
>
>
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