Lock Error in HMC769 using 20MHz reference

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Question When using HMC769, its demo board and demo software, I encounter no problem 
 using inside 50mhz ref.
 But if I try the use of 20MHz Ref, Lock error appears. On the other hand the 
 frequency on spectrum analizer seem OK, Can you help me? Answer The existing register settings for the p/n as extracted from the software is 
 shown below:

Recommended Register Settings:

Also, a good reference will be the operation manual on the product page.

This should help.

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