Before revision: It is substituted for the antenna while adjusting the transmitter, so that no radio waves are radiated (although, as no dummy load is an ideal dummy load, some radiation will occur), so that the transmitter does not interfere with other radio transmitters during the adjustments.
After revision: It is substituted for the antenna while one adjusts the transmitter, so that no radio waves are radiated (although, as no dummy load is an ideal dummy load, some radiation will occur), so that the transmitter does not interfere with other radio transmitters during the adjustments.