如何测试双向无线链路上的 PA 输出

In our two-way wireless link system TX900, the output power is automatically adjusted based on transmission distance. 如果您需要 test the PA (功率放大器) 输出功率, the automatic adjustment must be temporarily disabled, and long-range mode enabled. This guide provides a safe, step-by-step procedure.

步 1: Stop the Wireless Modem

Before making any changes, stop the modem to prepare for configuration:

AT+CFUN=0  

步 2: Enable QPSK Single-Antenna Long-Range Mode

Activate the long-range test mode to fix the output power for accurate measurement: （The TX900 purchased by the customer operates at 800 MHz, and the shipped 800 MHz units are configured with a 2 W transmit power using the specific set parameter 19. 因此, this naming corresponds to that configuration. 对于其他频率, please confirm with us first.）

AT^DSONCTX=1,8160,5,"19",0,0,0  

步 3: Start the Wireless Modem

Restart the modem to apply the changes:

AT+CFUN=1  

步 4: Measure the Spectrum

Perform spectrum measurements on ANT1. Make sure your measurement equipment is correctly connected and calibrated.

步 5: Restore Normal Operation

After testing, return the modem to normal operation by executing:

AT+CFUN=0              // Stop the modem  
AT^DSONCTX=0           // Disable long-range test mode  
AT+CFUN=1              // Start the modem in normal mode  

Important Safety Precautions

• Only trained engineers should perform this procedure.
• Improper testing may damage the device. Any damage requires repair in China.
• Double-check all commands and connections before executing.

按照这些步骤, you can safely test PA output on a two-way wireless link while ensuring the device returns to normal operation afterward.

相关帖子

1. More AT commands for two-way wireless link TX900
2. 无线视频数据收发器TX900用户手册