i am just testing the tx power of AD9361 with the FMCOMMS2 and Zedboard platform.
The Tx1A path is enabled and the Tx2A is disabled, the Tx Attenuation is 0 dB with reg 073 and 074 set zero, and BIST is used to generate a sine wave ,but i got the max tx power is just about -1.7dBm. The tx LO Frequency is 800MHz, and the reference max tx power shall be about 8dBm.
Below is the test result of PSD,
Picture1. PSD of sine-wave
Can somebody give me some suggestions?