Charles  

>The input impedance of the divider board is nominally 50 ohms (closer to 45 
>ohms, with 1Vrms drive

??? How do you get to that 45 ohm figure.  The input has a pair of 100R in 
parallel, so I can't see how it can be 45R input impedance.  Did you derive 
that figure based on observing the amplitude change of the Tbolt when connected 
to the board, and when disconnected?  If so I'm be more likely to suspect the 
the T output impedance isn't 50R.

Enquiring mind wishes to know :)

Cheers
Dave

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