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NF of transistor mixer ?


I have made here a UHF downconverter which has a transistor mixer in it.
I want to make some NF measurements, but first I wanted to know how much the 
whole thing will give in theory (pre-amp + mixer + IF amp). However, I have 
no idea how much NF I can count for my transistor mixer...

I have been looking for some literature about it, but I can not find 
anything concrete.
The NF data of the transistor I have, but I am not sure if I just can take 
the NF out of the data-sheet...

73 de PE1RAH, William

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