[R-390] aligning the balanced input

[Steve Hobensack]

I align the balanced input by selecting two matched 68 ohm resistors. I 
solder them in series and push the wild ends into the balanced input 
connector. I attach a signal generator to the center of the two resistors, 
and apply a signal. There is a deep null at the balance point while 
adjusting the balancing trimmer. Inject only a small amount of signal.
73...Steve...KJ8L

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