... signals of 150, 160, 170, 180Hz on the panel of T04 transmitter, which can be selected for using, ... . If to change the modulation signal on the panel of transmitter, it needs to regulate the frequency ... , firstly disconnects the P5 terminal antenna on transmitter panel, set the JP1 on 1&2. Connect the probe ... , then re-connect the P5 terminal antenna properly, set JP1 on 2&3. 3) Radio frequency output ...