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The operating frequency for an in-building cellular repeater system is the frequency your cellular provider uses in your area. For example, in the United States Sprint is a 1900MHz PCS carrier, therefore, if you want to repeat Sprint signals in your building you would need an external "Donor" antenna to receive the available Sprint 1900MHz signal outside, a cable would take the signal from the antenna to a powered amplifier designed to amplify the 1900MHz band. Another coax cable would go from the amplifier to the internal antenna in the building which is what your cellular phone would communicate with.

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