Buehler, Martin wrote:
> when doing analog circuits like amplifiers and filters, it's often
> helpful to check if the behaviour of the 'real circuit' is the same as
> what you did in theory.
> 
> a professional network analyzer, which usually goes up to a few ghz in
> frequency, is really an overkill in price, size, bandwidth and
> functionality for a hobbyist. i think in most cases a total bandwidth of
> 50hz to 1mhz is enough.
> 
> -> requirements: 
> 	frequency range 50hz - 1mhz
> 	measuring bandwidth variable
> 	transfer and reflexion measurement
> 
> 
> so here are my questions:
> 
> 1: has anybody ever built such a device itself? is it possible to get
> some infos on it?

See these links:
<http://search.analog.com/search/default.aspx?query=impedance+analyzer&local=en>

<http://www.amqrp.org/kits/micro908/index.html>

<http://www.tapr.org/kits_vna.html>

I have a micro908 myself, halfway through the final upgrade, have been 
very pleased, maybe have to wait till year-end slag to carry on my 
addiction.

Analog chips are pretty new, they have a good sampling program.

Have fun.

Ling SM
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