TM 1-1520-240-103-2-11Figure 3-2-5. VHF AM/FM Radio Set (AN/ARC-186)b. Transmit-receiver mode.(1)Mode select switch — TR.(2)Frequency Control/Emergency SelectSwitch — As required. If greater receiver sensitivity isrequired, set the SQ DIS/TONE switch to SQ DIS.(3)VOL control — As required.c. Stopping. Mode select switch — OFF.d. Presetting channels. Perform the following stepsto preset a channel to a desired frequency.(1)Mode select switch — TR.(2)Frequency select switch — MAN.(3)Rotate the four frequency select switchesuntil the desired frequency is displayed.(4)Rotate the preset channel selector until thedesired channel appears in the preset CHAN indicator.(5)Remove the snap-on cover.(6)Momentarily set the bandwidth WB, NB,MEM LOAD switch to MEM LOAD. The preset frequencyis now in memory.(7)Using a soft lead pencil, record the loadedfrequency opposite the channel number on the snap-oncover.(8)Using the above procedure, preset any oth-er channels and install the snap-on cover.3-2-16. VHF/FM Radio Set (AN/ARC-201).The AN/ARC-201 is located on the pilot instrument paneland provides two-way frequency modulated (FM narrowband voice communications.a. The following items from the airborne radio sys-tem.ITEMDESCRIPTION1.Receiver-Transmitter Radio Panel Mounted(RT-1476)2.Amplifier (AM 7189)b. Essential Operational Technical Characteristics.Except where specifically indicated otherwise, the follow-ing operational/technical parameters are the minimumessential characteristics. Unless otherwise specified,they apply to each radio configuration.
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