Dummy load
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A dummy load also known as a radio frequency termination, is a device used in place of an antenna to aid in testing a radio transmitter. It is a substitute for the antenna when transmitting into an antenna might create interference or is otherwise undesirable. If a transmitter is tested without a load, such as an antenna or a dummy load, the transmitter could be damaged. A dummy load absorbs the incoming signal from the transmitter and converts that energy into heat. Without a dummy load, the energy is reflected back to the transmitter, possibly damaging it.
Normally, a dummy load is a completely ohmic load used mainly in radio frequency electronics. The device takes the place of the antenna, where it dissipates all radio frequency power as heat. The resistance of the dummy load matches the intended resistance of an antenna, typically 50 ohms.
The ideal dummy load provides a standing wave ratio (SWR) of 1:1 at the given impedance. There are also dummy loads for power supplies, also known as load banks.
See also
External links
- Bird Electronics - Power terminations and loadsde:Dummy-Load