Something ain't kosher. Are you measuring the same thing on both radios? With the same PS? With the same meter? What you describe doesn't fit in with my view of "Voltage Drop". Dan / WG4S / K2 #2456 <snip>My power supply drops to 12.1 volts. My ts570 at 100 watts only drops .2 of a volt so I am curious.</snip>