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Knowledge Base > Discontinued Products > TI-101 Telephone Interface

TI-101 Telephone Interface has hum in the caller audio

The signal to noise performance of the TI-101 can be improved 15 dB by relocating the power transformer. If your power transformer is mounted on the bottom of the chassis its field induces hum into the caller output transformer. Remounting the power transformer to the side of the chassis corrects the problem. The details are in the TI-101 Service Notes.

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