The correct procedure: Before transmitting, create a narrowband bandpass filter at the RF output. Use comprehensive testing to ensure that the transmission parameters meet the requirements and regulations specified in GB-T 32658-2016. Before formally transmitting, notify the local "无委" (regulatory authority) of the desired frequency range and bandwidth, ensuring compliance with national and local regulations.
Other testing applications ensure connection to a 50Ω impedance load.
P.S.: To ensure durability, the original filtering circuit inside the device can be removed.
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