I have a maxtrac 300, 32 ch, 60 watt vhf low band (42-50mhz). When I connect it to the power supply and tx-rx it seems to work fine. But while in tx the voltage on the power supply drops to 5v from 13.8v. When I connect a 40 watt uhf of the same make, there is no voltage drop. Do I have a bad supply or radio? Anyone have advice. Oh, the power lead to the low band is a motorola origional with a 15amp blade fuse. My power supply is an astron 20amp. Any help would be appreciated.