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Using the SA 7L13 and the TR502 to calibrate a filter with 75 ohm impedance.

 

Hello everybody,
I would like to calibrate a VHF band pass filter using the tracking generator TR503 (converted to TR502) and the SA 7L13 in the mainframe 7613, but I have the problem that they have a characteristic impedance of 50 ohm while the filter has input and output impedance of 75 ohm . How can I do ?
I have seen on the internet a 50 to 75 ohm BNC adapter (5.7 dB attenuation) but it is quite expensive.

Thanks for the attention
-- Cheers
Attilio
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