What is the acceptable voltage range for the FLEX-1500?
The FLEX-1500 is designed to operate off of a 13.8 VDC source. It can operate over a limited voltage range. The range is dependent on whether or not you are using the FLEX-1500 as a receive only, very low power QRP transceiver or “high power” QRP transceiver. This information is covered in more detail in the KB article Voltage and Amperage Requirements for the FLEX-1500.