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Table 5-2.Operating Controls and IndicatorsContinued
AN/PRT-5 TRANSMITTING SET

Aircrew Survival Equipmentman 2 - Aviation theories and other practices
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as appropriate. The antenna snaps into an upright position. Fully extend all five telescopic sections of the half-wave antenna by grasping it by its tip and pulling outward. 2. Set the function switch to the mode of operation that you want. The function switch is set by rotating the thumb knob on the right-hand side so that the arrow points to the mode selected. The function switch is detented and clicks into each position. Rotate the knob down one click (from OFF) for VOICE/MCW 243.0 operation, or two clicks for BCN 243.0 operation. For VOICE 282.8 operation (secondary channel), push the button with the arrow and rotate the function switch knob up one click. 3. For voice operation, hold the radio set and adjust the VOL control. To transmit, push down the PRESS TO TALK button and speak directly into the TALK microphone. 4. If guard channel steady-tone transmission or Morse code operation is desired, set the function switch to VOICE/MCW 243.0. Depress the MCW button to transmit the tone. Listen for the sidetone in the LISTEN speaker or earphone while the MCW button is depressed. This sidetone indicates proper transmitter operation. 5. For guard channel beacon operation, set the function switch to BCN 243.0. The transmitter 239.439 Figure 5-9.—Beacon set, radio, AN/URT-33A (front view). continuously sends the swept-tone beacon signal at this setting. Listen for the sidetone as an indication of proper operation. In the beacon mode, the sidetone is a chirping sound. NOTE: Since the transmitter is keyed automatically in the beacon mode, and since continuous transmission may be needed for a prolonged period of time, the AN/PRC-90 may be placed upright on a flat surface. It will then transmit automatically. AN/URT-33A BEACON SET RADIO The Beacon Set Radio, AN/URT-33A (figs. 5-9 and 5-10), is an emergency radio beacon transmitter that, when properly actuated, transmits a tone-modulated radio frequency signal on the emergency guard frequency of 243.0 MHz. Although the AN/URT-33A was designed to be placed into a parachute pack, the Navy normally places the beacon radio into the seat pan (RSSK) or life rafts. Instructions for properly rigging the AN/URT-33A can be found in NAVAIR 13-1-6.1. The AN/URT-33 radio has two types of antennae. One type is the flexible wire antenna. This antenna is used during parachute descent 239.440 Figure 5-10.—Beacon set, radio, AN/URT-33A (rear view). 5-10







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