When I Transmit my the display shows my Voltage Drops Shawn June 30, 2016 21:40 Updated A voltage drop during transmit is normal on the SR-655HPC, SR-955HPC & SR-89MC. Related articles My 655hpc has a D.C. Low on the screen. What does this mean? Change radio display to show volts? Common factors that cause high SWR readings SR-655HPC Setup Guide How many amps does the SR-955HPC radio draw? Comments 0 comments Article is closed for comments.