The Motorola Radius SP10: A Lifeline in the Wilderness
To Transmit: Press and hold the Push-to-Talk (PTT) button on the side of the radio. Speak clearly into the microphone. Note that many models have a Time-Out Timer (TOT) that cuts off transmission after 60 seconds of continuous PTT holding. Instruction Manual For Motorola Radius Sp10
According to the manual, the SP10 used a combination of FM radio waves and a built-in antenna to connect with other Radius radios within a range of up to 10 miles. It was a simplex device, meaning I could only communicate one-way at a time, but it was better than nothing. The Motorola Radius SP10: A Lifeline in the
Durability: Built to Mil-Spec 810 standards for shock and vibration resistance. Maintenance and Troubleshooting Instruction Manual For Motorola Radius Sp10