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.

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 ...)

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

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?

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

Jim


----- Original Message -----
From: "Brendan Moran" <bmoran@MILLENNIUM.CA>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Tuesday, July 09, 2002 4:41 PM
Subject: Re: [EE]: Directional couplers & T/R test sets


> Perhaps I should refer to what I am actually trying to do here.  I have
this
> same preamp.  The input is really not much of a question since the source
> for it is a >5k + j0 ohm coil.  It's tough to match, but I have something
> that works.  Once again, magnetic components for this particular project
are
> a nono.  It also needs to be small in size.  This eliminates the use of
> large value inductors, and large trimmer caps.  It's the output that's
> giving me grief.  I need to get a measurement of the current impedance
> before I can do much to fix it, since the only specs I have for the active
> component are for a long way outside of my freq. range.
>
> The test equipment I have available is as follows:
> 1xHP4395A network analyser
> 1xHP54645A DSO
> 1xHP43961A Impedance test set
> 1x Nice function generator.
> 1x Not so nice function generator.
>
> 1x Hybrid power splitter
>
> With that, and something I can build easily, how can I measure
s-parameters
> or impedances accurately?
>
> --Brendan
>

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