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Stage One — You can make an immediate improvement until you have your balanced-to-unbalanced transformers wired…..
Use the balanced outputs from your mixer, 2-center conductors plus shield, all the way up to your transmitter…. at the transmitter tie the shield and negative together thus making a cheap conversion to unbalanced, and connect to the transmitter inputs.
Stage two — the far-end (transmitter end) of both lines add transformers, neatly and safely installed in small plastic project boxes (also Radio Shack), converting balanced to unbalanced, and into your transmitter.
EDITOR’S ADDITION Frankly, why run two entire audio lines up there when it ends up being converted to mono in the transmitter? Instead, you could convert to mono right at your mixer….MAYBE YOUR MIXER HAS A MONO OUTPUT, IF IT DOES USE THAT!
If your mixer only has a stereo (2-channel output), convert the balanced lines to stereo as follows:
Tie the shields(grounds) together in the usual way all the way from end to end;
Connect the left and right + wires from left and right channels each through a 5k resistor, and combine the resistors to the same mono cable;
Connect the left and right – wires from left and right channels each through a 5k resistor, and combine the resistors to the same mono cable;
DO NOT COMBINE L + R OUTPUTS DIRECTLY WITHOUT A SPLITTER RESISTOR NETWORK!
At the transmitter end feed the un-balanced wire, after conversion by the transformer, through a normal splitter and plug into red and white audio inputs on the transmitter..
If this is hard to follow, perhaps someone will provide a diagram.