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Customize Balun for DC2461A (EVALBOARD LTC5548)

Hi,

I'm looking for a downconverter in range 3.5-7.5 GHz and can produce IF in range 10-100kHz. I'm considering LTC5548 since I think it can handle low power signals. But the problem is its standard evalboard (DC2461A) comes with TC1-1-13M+ which works 4.5MHz above. So, do you have any suggestions for a custom balun? 

Actually from minicircuits gave me recommendation balun T1-6-KK81+ or TT1-6-KK81+ but I'm not sure about the matching impedance because both of them have different configuration with TC1-1-13M+.

Thanks,

Ghozali Hadi