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Re: Re: Phasing Issues? **UPDATE**
To: CRTech <crtech@crtech.org>
Subject: Re: Re: Phasing Issues? **UPDATE**
From: RADIO DOCTOR <lylehenry@fastmail.fm>
Date: Sun, 9 Apr 2017 18:57:15 -0700 (Pacific Daylight Time)
Cc: The BROADCAST eList <broadcast@radiolists.net>
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User-agent: Alpine 2.10 (WNT 1266 2009-07-14)
If the black (-) wire is from the left channel, you need to hook it to the (+) on the 9100 along with the red one. Otherwise it is out of phase as you are experiencing. Connect the shields from the red and black wires to the (-) terminal on the 9100. May need to also connect to the chassis to avoid hum. This assumes that the 9100 is a mono processor, which I think it is (hey, I'm an FM guy).

It would be good to put a 51-100 ohm resistor in series with the red wire and another in series with the black wire before they connect to the + terminal on the 9100. That can reduce distortion which could be caused by the right and left channels looking back at each other's low impedance output.

On Mon, 10 Apr 2017, Robert Chrysafis wrote:

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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References: Re: Phasing Issues? **UPDATE**
(Robert Chrysafis <kc8gpd@hotmail.com>, 10 Apr 2017 01:38:14 -0000)
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