About the output of AD9951

Question

Dear Forum 
 I refer the official manual to design AD9551 ,and my output filter is refer AN-837 as follow，

now my problem is when my output frequency is 100KHZ,it output normally,but when my output frequency below 30KHZ,it hadn't output,the signal 
 at primary is 1.75V(DC),and the signal at secondary is zero,my balun is ADTT1-1+，I want to know why?

Struggle_HL · Accepted Answer

Hi,Louijie 
 Thanks for your answer. 
 You're right，I check the ADTT1-1,when signal less than 100KHZ,it start to attenuate.Now,I Change another balun(ADTT1-6+) to used. 
 Best Regards 
 Struggle_HL)

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About the output of AD9951