A dummy load mimics the electrical resistance of an antenna in a radio transmitter system. Operating a transmitter without an antenna or dummy load can cause damage to the transmitter. Resistance of the dummy load is measured in Ohms. Use a dummy load with a rated resistance higher than required for your transmitter. Radio operators need a dummy load for testing and maintenance procedures on the transmitter.
Instructions
1. Determine the necessary dummy load resistance. This varies with the size and power of the radio transmitter and is stated in the transmitter specifications. It is identical to the specified resistance of the antenna.
2. Connect the output cable from the transmitter to the dummy load. A coax cable is commonly used between the transmitter and antenna or dummy load. The dummy load and antenna should both have the same connecting hardware so the devices can be interchanged easily.
3. Keep the dummy load cool. The resistors of the dummy load will generate heat. The bigger the dummy load required by larger transmitters, the more heat. Keep the dummy load in an open area or set up a fan to move air across the dummy load.
