Final answer:
The specific audio output power of the AN/PRC-150(C) is not provided; however, typical communication devices have output powers ranging from a few milliwatts to around 100 mW.
Step-by-step explanation:
The audio output power of the AN/PRC-150(C) for an external handset with 1000 ohms impedance is not explicitly provided here, thus a direct answer cannot be given. However, for a general understanding of audio power in similar communication devices, output powers typically range from a few milliwatts (mW) to around 100 mW for handsets connected with this level of impedance.
For example, as mentioned, an outdoor WiFi unit with a 100-mW output can have its range reduced from about 30 meters to 12 meters by decreasing its output power. The reduction in power would be determined by the inverse square law relating to the spread of electromagnetic waves.