This paper describes a means of economically adding up to fifty VF circuits to a microwave radio system in addition to the regular payload signal. One feature of this system is its ability to add or extract information at IF repeaters without either bringing the payload signal to baseband or adding additional circuitry in the payload path.

The medium‐haul application of TH‐3 was developed to provide an economically attractive system of moderate length and cross section without seriously compromising performance. To achieve high‐quality transmission the radio transmitter‐receiver bays and FM terminals common to the long‐haul plant were used. Supporting equipment was both designed and adapted specifically for the medium‐haul application in order to keep overall costs to a minimum.

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