RF Signal Strength issue in custom board

Hello Everyone,

We are facing issue in the RF output signal strength in our custom board.

In AD9739A-FMC-EBZ( REV C ) evaluation board RF= 72dBuv, MER= 40.9dB and BER = 1.0e-8 to 6.2e-8.

But in our custom board we are getting RF= 50dBuv, MER= 40.9dB and BER = 1.0e-8 to 6.2e-8.

What is the solution to increase the signal strength? what might be the cause?

Kindly suggest.