> It looks to me like you've got a lot of
> what you need in that "HP 4395A network
> analyzer".
>
> I would take my active device and build a
> small fixture and simply characterize it
> using that HP 4395A at my frequency of
> interest.

Ah, yes, it is that fixture that seems to be the problem

> Does that particular 4395A have any options
> (like the Impedance Measurement Function
> and RF Impedance Test Kit)? (I don't own
> one - I'm looking at it in the HP catalog ...)

It has impedance analyser, spectrum analyser and network analyser modes.

> Oh - I see you have the HP43961A Impedance test
> set. (Too bad you don't have the S-Parameter
> Test Set for the 4395A.)

That's what I said.

> With the Impedance Test Set you can get the Z
> looking into a 'network' (like your pre-amp).
>
> Now you need a test set-up to measure Insertion
> Loss (and Phase change) and come up with gain
> (or loss) of a network.
>
> What are those four ports on the HP 4395A:
>
> 1) RF Output
> 2) R(ef) Input?
> 3) A and
> 4) B inputs?

Correct

> I think you are closer than you think to a
> solution!

I expect I am.  However, this, unfortunately, falls under the "so close, yet
so far" range, I think.

I have just been having trouble figuring out how to measure reflection
coeficients.  Transmission loss is not a big concern to me, since that one's
easy to measure with a network analyser.

Thanks again

--Brendan

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