Definition
A non-radiating resistive device connected in place of an antenna that absorbs the transmitter's radio frequency output and converts it to heat, allowing a transmitter to be tested or tuned without sending a signal over the air.
Plain English
A test device that takes the place of an antenna so a radio can be powered up and checked without actually transmitting on the air. Instead of broadcasting the signal, it soaks the energy up and turns it into heat.
Context Anchor
Seen in aircraft radio and avionics maintenance when a transmitter or other electrical equipment must be tested without using the actual antenna or normal connected equipment.
Derivation
Dummy' here means 'stand-in' or 'substitute' — the same sense as a dummy hand in cards or a crash test dummy. It's not the real antenna; it's a fake one that lets the radio work as if it had one.
Why Pilots Care
Prevents unwanted transmissions that could interfere with ATC or other aircraft during radio maintenance.
Analogy
It is like putting a practice target in place of the real target. The equipment can do its job for the test, but the result is contained and controlled.
Intuition Check
Do not read “dummy” as careless or low-quality, and do not read “load” as cargo. In this term, a dummy load is a controlled electrical substitute that safely receives power during testing.
Example Sentence 1
Before adjusting the transmitter's output, the technician connected a dummy load to keep the test signal off the air.
Example Sentence 2
Using the dummy load allowed the mechanic to tune the radio without creating interference during the test.