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The demodulated 121.5 MHz audio signal is annunciated at all times. If there is not any signal on the 121.5 MHz carrier, whether activated beacon or other source, static will be audible. The speaker volume is high, and the signal strength meter is active. Monitor Low mode This mode is identical to the Monitor High mode except that the speaker volume is lower. NOTE: The ARX-50 reverts back to Alarm mode after 15 minutes in Monitor High mode. Training mode Operation in Training mode is identical t