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RE: Re: Phasing Issues? **UPDATE**
To: CRTech <crtech@crtech.org>
Subject: RE: Re: Phasing Issues? **UPDATE**
From: "Allard, Mark G" <MGAllard@unwsp.edu>
Date: Mon, 10 Apr 2017 19:47:31 +0000
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In-reply-to: <36946D292176674E957C13106F0CC784B5F58D5E@EMP-MB-02.emp.ark.nwc.edu>
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Thread-topic: [CRTech] Re: [BC] Phasing Issues? **UPDATE**

If the criteria is met, the solution is very simple.

 

At the Behringer:

connect shield to chassis,

connect L+ to one side of twisted pair going to Optimod,

connect R- (not the +) to the other side of twisted pair going to Optimod.

That’s it, all done.

 

Criteria:

Given there is a shielded twisted pair from Behringer to Optimod:

*The Behringer has balanced outputs—not floating coils.

*The outputs do not have what I call Servo-Coupled circuitry.

                To test for this, send tone out of Left channel and adjust for 0db as measured from + to - terminals. 

First, short the + terminal to gnd.  If the measured level goes down approx. 6db, then the above circuit will work.

Do the same with the – terminal to gnd.  If the measured level goes down approx. 6db, then the above circuit will work.

When done testing, remove the short.

*The Optimod is balanced in or floating in.  Either way, the connections stated above will work.

 

Fyi,

It is advantageous to have the source impendence (at the Behringer end) as low as possible.

If there is any capacitance added by the input circuitry of the Optimod and a long cable run, adding resistors to the output of the Behringer will cause the high-end of audio to start rolling off.

 

Mark A

 

 

From: Allard, Mark G [mailto:MGAllard@unwsp.edu]
Sent: Monday, April 10, 2017 13:58
To: CRTech <crtech@crtech.org>
Subject: Re: [CRTech] Re: [BC] Phasing Issues? **UPDATE**

 

I believe my solution is better than that.

On Apr 10, 2017 1:56 PM, BIll Moede <bmoedereplay@gmail.com> wrote:

Unless you are real particular about maintaining that 600 ohm load throughout the system you can just combine  + to + and - to -,  don't really need resistors.

 

On Mon, Apr 10, 2017 at 12:49 PM, Allard, Mark G <MGAllard@unwsp.edu> wrote:

L+R can be accomplished without resistors.

On Apr 10, 2017 11:31 AM, Bill Hurne <billhurne@pilgrimradio.com> wrote:

Appears you're airing only the right channel which of course would produce
missing elements, especially in older music where the stereo separation
tends to be more extreme than more recent productions.

This could be fixed by summing the left and right in the mixer if it has
that capability, or adding the resistors you ordered to mix left and right.

Bill

-----Original Message-----
From: Robert Chrysafis [mailto:kc8gpd@hotmail.com]
Sent: Sunday, April 09, 2017 6:38 PM
To: CRTech; The BROADCAST eList
Subject: [CRTech] Re: [BC] Phasing Issues? **UPDATE**

Here is how i originally had everything hooked up.

i just have the red (+) from right channel put to (+) on the processor input
and the black (-) to the (-) on the processor input which in this case is an
optimod 9100b.

on the output to tx input which is 600 ohm unbalanced i have the shield
(output) to shield (input) and the positive rail (output) to hot on input.

i had a passive balun kicking around which i have put on the output so
balanced is going into balun and coming out unbalanced. this is now hooked
up between tx and optimod

i have on order 475 ohm 1% and 20k ohm 1% resistors which should be here
monday which i will use to properly sum the input to the optimod.

i am hoping based on some of the comments i have seen that this will solve
the missing vocals and/or instrumentation issues.

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--

Bill Moede

920-450-7032

 

References: Re: Re: Phasing Issues? **UPDATE**
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