| Balanced Line |
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The conductors are sometimes carefully twisted together to ensure that each conductor is equally exposed to any external magnetic fields that would induce unwanted noise. The line is capable of being operated in such a way that when the impedances of the two conductors at all transverse planes are equal in magnitude and opposite in polarity with respect to ground, the currents in the two conductors are equal in magnitude and opposite in direction. Balanced lines can carry electrical signals farther than Unbalanced Line s because any noise on the line will not be balanced and thus gets filtered out. For this reason, balanced lines sometimes do not have electrical Shielding on the wires. A "balanced" cable can be used in an unbalanced system (the cable itself is not balanced, the complete system is). The opposite is not true. OPERATION As an example: a Microphone connected to a mixer. A typical professional microphone has 3 pins on the ), and the noise has been canceled out. EXAMPLES
BALUNS To convert a signal from balanced to unbalanced requires a Balun . For example, baluns can be used to send line level audio (which is unbalanced) over 300 feet of CAT5 cable by using a pair of baluns at each end of the CAT5 run. SEE ALSO EXTERNAL LINKS |
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