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ADRF6720-27 evaluation board output power

Hi,

we plan to use ADRF6720-27 in our project,

but we can't achieve output power which mentioned in datasheet at the evaluation board output. 

for example for output freq. 1.9GHz (2.7V input bias, 0.5Vpp at each of 4 BB inputs) output power is only 3.3dBm and according to datasheet it should be 4.5dBm. 

Should we consider this 1.2 dB as a losses of the eval board?

Thanks,

Sergey