Major Components

Major Components The AN/ARN-84(V) TACAN set consists of five major components. They are the control panel, C-9054/ARN-84(V); the receiver-transmitter, RT-1022/ARN-84(V); the signal data converter, CV-2837/ARN-84(V); the RF transmission line switch, SA-1818/A; and the antenna assembly, AS-26281A. TACAN CONTROL C-9054/ARN-84(V).— The TACAN control box (fig. 2-13) contains the controls to turn the system on and off, to make mode and channel selections, to control identity tone volume, and to initiate self-test. The control panel includes the GO and NO-GO indicators for the self-test. RECEIVER-TRANSMITTER RT-1022/ ARN-84(V).— The RT (fig. 2-14) consists of 10 removable modules mounted on a chassis assembly. The front panel contains a spare fuse, temperature gauge, elapse time meter, built-in test (BIT) indicators, and a BIT switch. The front panel also contains the antenna connector jack and a blower motor. The RT transmits and receives the pulsed RF signals. It detects, decodes, and demodulates the signals after reception. Bearing and slant-range information is computed in the RT along with processing of the beacon identification signals. When the self-test switch is pressed on the control box, the RT processes the test signals. SIGNAL DATA CONVERTER CV-2837/ ARN-84(V).— The signal data converter (fig. 2-14) is mounted to the back of the RT. There is an elapse time meter on the left side of the converter. This converter electrically connects the mount and the RT. Figure 2-13.-TACAN control panel C-9054/ARN-84(V). Figure 2-14.-TACAN receiver transmitter and signal data converter. The signal data converter contains the range and bearing couplers, an interface, and a buffer. This box sends the range and bearing data to the indicator group to be displayed on the indicator. The buffer regulates the power for the system and acts as an interface between the RT and the mount. The interface network enables the range, bearing, operating mode, channel number, data link, and digital data to be transferred to the indicator group. RF TRANSMISSION LINE SWITCH SA-1818/A.— This switch is an auxiliary unit of the system. It enables the TACAN set to select the antenna receiving the strongest signal. ANTENNA ASSEMBLY AS-2628/A.— The UHF L-band blade antennae house the antenna elements used by the TACAN antenna system. These antennae are used by both the TACAN and the UHF communication sets. Operation Only three of the operating modes will be discussed here. They are the receive, transmit/ receive, and air-to-air modes. The fourth mode, beacon, is not used in most aircraft. RECEIVE MODE.— In the receive mode, the system will provide bearing and station identity only. The transmitter is disabled to ensure that radio silence 2-14