Questions about AD9642 EVB's input

Question

What are the reasons that the SMA's SHOULD BE PLACED 540 MILS CENTER TO CENTER in the AD9642_AD9634_AD6672_schematic ? 
 https://www.analog.com/media/cn/technical-documentation/evaluation-documentation/AD9642_AD9634_AD6672_schematic.pdf 
 
 As declared in the Page3 .

UmeshJ · Accepted Answer

no reason. it was an internal standard we adopted that allowed the smas to be spaced such that 
 - a torque wrench could fit in between 
 - we could interface with an amplifier eval board without cables; use just sma barrels.

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Questions about AD9642 EVB's input

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