What is a fixed frequency conduction prototype?

Fixed frequency conduction module is used for some conduction test items in certification. The firmware in the module is fixed frequency firmware, and an RF cable will be soldered, with the RF cable being an SMA head, connected to equipment such as a spectrum analyzer for testing. The module leads out 3.3V, GND, RX, TX to connect to a USB serial port board, which can be connected to a computer through the USB serial port board, and then the module can be fixed frequency through test software or test commands, allowing it to work fixedly on a certain channel with the maximum duty cycle. It is mainly used for RF certification test projects of conduction direct connection type: fixed frequency conduction module is used for some conduction test items in certification: maximum output power (EIRP), power spectral density (PSD), occupied channel bandwidth, out-of-band emission, emission spurious (conduction), reception spurious (conduction), etc.