Re: S-parameter test sets

Terry Given wrote:
>
> Wes Stewart wrote:

[...]

> > Today in retirement, I'm content with my N2PK network analyzer.
> >
> > www.n2pk.com
>
> yeah, thats pretty neat. I thought about making one, but I want to do
> control loop analysis (among other things) and so need phase too, but
> not as much bandwidth - but 200MHz is still pretty useful :)
>
> Cheers
> Terry

Terry,

Are you talking about a different unit? Here's the description for n2pk:

" capable of both transmission and reflection measurements from 0.05 to
60 MHz, with about 0.035 Hz frequency resolution and over 110 dB of
dynamic range. Its transmission measurement capabilities include
gain/loss magnitude, phase, and group delay. Its reflection measurement
capabilities include complex impedance & admittance, complex reflection
coefficient, VSWR, and return loss."

This is a neat system - fits on a 2.5" x 3.8" pcb, so it can't be that
difficult to build.

For low frequency work, it might be possible to extend the low frequency
limit by reducing the crystal frequency. However, oscillator jitter is
important. Read his article "Testing of the Fox JITO-2 Oscillator as the
N2PK VNA Master Oscillator":

http://users.adelphia.net/~n2pk/VNA/JitoPN.html

Mike Monett
.

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