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Loop gain

In telecommunication, the term loop gain has the following meanings:

1. The total usable power gain of a carrier terminal or two-wire repeater.

Note: The maximum usable gain is determined by, and may not exceed, the losses in the closed path.

2. The sum of the gains, expressed in dB, acting on a signal passing around a closed path, i.e. , a loop.

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

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