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5 years, 12 months ago.
The Tx power is not correspond to the Uart command
Hi supporter
I connect my board with the RF cable to the SA.
After follow the instructions for transmitter test.
I saw the power is abnormal.
Is there any specific set up I need to do? 
1 Answer
5 years, 11 months ago.
If you are testing at 915MHz, you should have your SMA cable on the ANT_HF connector. Such a low power level would suggest you are on ANT_LF. You should use a 20dB attenuator on spectrum analyzer for safety.
When you use the command "op 20" you should see "+20dBm PADAC bias". You can verify +20dBm TX bias by reading register 0x4d, ie "r 4d"
Hi Wayne
It`s glad to have your suggestion. AS you refer, I have confirmed that my set up is just what you suggest. The result still the same. https://os.mbed.com/questions/79158/The-Tx-power-is-not-correspond-to-the-Ua/
posted by 02 Oct 2017