TM 1-1520-238-10 3-18.6 Change 3 3.7B RADIO SET RT-1518C/ARC-164 HAVEQUICK II (HQ II) RADIO The RT–1518C/ARC–164 HQ II radio provides a Liquid Crystal Display (LCD) (Green Lt) for channel, frequency indicators, and operator prompts; a zeroize switch fea- ture; and an electronic Fill Port data loading capability. 3.7B.1 Antenna. The UHF-AM antenna (fig 3-1) is lo- cated on the bottom center fuselage area and is mounted directly aft of the doppler fairing. 3.7B.2 Controls and Functions. Controls for the RT–1518C/ARC-164 are on the front panel of the unit (fig 3-7). The function of each control is described in table 3-6. CAUTION The AN/ARC–164 radio must be placed in the VERIFY/OPERATE mode before oper- ating in the Have Quick mode. This will prevent the radio from locking up and damaging the equipment. 3.7B.3 Modes of Operation. a. Power Up. All segments of both displays light up momentarily on power up and a series of beeps may be heard. If the frequency/status indicator displays a fre- quency after power up, the radio is in the VERIFY/OPER- ATE mode. Proceed to step 5. If M–LOAD, FMT.CHG or ERASE is displayed, proceed as follows: 1. CHAN switch – Set to channel 20. 2. Frequency switches – Set to 220.000 on the frequency/status indicator. 3. Function Selector switch – PRESET. 4. Lift access cover and press LOAD button. The radio is now in the VERIFY/OPERATE mode. 5. Function Selector switch – MNL or PRESET. 6. Select desired frequency or channel. 7. Mode Selector switch – OFF. b. Normal Operation. The radio set has the follow- ing modes of operation: (1) MAIN mode: Two-way voice communication. (2) BOTH mode: Allows using the main transceiv- er with constant monitoring of the guard receiv- er. (3) GUARD (GRD) mode: Allows transmission and reception on guard frequency. (4) Manual (MNL) Mode: Single frequency used. M01-0362 FREQUENCY/ STATUS INDICATOR CHAN PRESET CHANNEL SELECTOR SWITCH STATUS BUTTON FREQUENCY SWITCHES FUNCTION SELECTOR SWITCH SQUELCH ON/OFF VOLUME CONTROL KNOB T-TONE SWITCH MODE SELECTOR SWITCH TEST DISPLAY SWITCH MANUAL SQUELCH ZERO SWITCH FILL PORT ACCESS GUARD SQUELCH LOAD Figure 3-7. Receiver-Transmitter Radio, RT-1518C/ARC-164