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The Receiver-Transmitter AN/ARC-4 RT-19 WE-233 equipment is a VHF communication unit designed for aircraft use in the 140 to 144 Megacycles band. It is intended for two way radio-telephone communication between airplanes and from airplanes to ground stations. It also provides an interphone system for the pilots.The equipment consist of a VHF transmitter and a VHF receiver mounted on a single chassie. Both the transmitter and the receiver may be pre-tuned for operation on any four crystal controlled frequencies in the 140 to 144 Magacycles. One of the four frequencies is intended for plane-to-plane communication. The remaining frequencies are intended for plane-to-ground communication. A transmitter crystal and receiver crystal are mounted in a single crystal holder and are so selected that the transmitter and the receiver both operate on the same carrier frequency. Crystal switching relays incorporated in the equipment permit the rapid selection of any of the four pre-tuned carrier frequencies. The radio receiver has two independent r-f input circuits which permit simultaneous monitoring on two carrier frequencies. One input circuit may be used to monitor continuously on the plane-to-plane carrier freuency. The other input circuit may be used simultaneously to monitor any one of the plane-toground frequencies. Provision is made to temporarily disable either circuit if two signals are received at the same time.
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