This is another one I built during my infatuation with copper pipe. It's suitable for QRP HF operation of 5-watts or less average power, and should be adequate for continuous operation at that level. It's light and compact, about 5-inches in length overall. This one is unique in that it has a built-in RF detector, with scaling, that may be used with your DC Voltmeter to measure power.
Dummy loads dissipate energy by generating heat.
Because of the thermal mass of the dummy load and its enclosure, that heat can stay around for a long time. Always locate your dummy load in a safe place, where there is no chance that it will burn people or catch something on fire. On the top side, we'll mount 4 of the 8 resistors, and on the bottom side we mount the remainder. Simply tack-solder the resistors to the board. Make all other interconnections with teflon-insulated wire.