Attenuator design

[fg45]

Hello,
I am trying to design some pi and t attenuators using passive components. I can design quite easily for a matched source and load impedance but I'm having trouble with a mismatched source and load.

Is there any methods to match the source and load impedances?

Will I have to somehow recalculate the resistor values?

Many thanks for any help

Fg45

 

[VEBill]

Google is your friend: Attenuator Calculator

http://www.raltron.com/cust/tools/t_attenuator.asp

The above offers for T attenuators.

I recommend that you cross-check all such random Internet findings. Trust but verify.