Use buck converter, or high wattage resistor inline, before regulator. All the heat will be on resistor.I'm having problem with regulator heat on paper when dropout V is factored in with 28v source.
Need to divide it down a bit...standing current. 4 MRF422's need 400mA for AB which is a lot of heat. Must include small fan. 1v meter from PRC is taking forever, Orange Connex is terribly slow.