Balance return loss
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In telecommunication, the term balance return loss has the following meanings:

1. A measure of the degree of balance between two impedances connected to two conjugate sides of a hybrid set, coil, network, or junction.

2. A measure of the effectiveness with which a balancing network simulates the impedance of a two-wire circuit at a hybrid coil.

Source: from Federal Standard 1037C and from MIL-STD-188

The original article can be found at: http://en.wikipedia.org/wiki/Balance_return_loss.
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