[SI-LIST] Re: FW: Calibration using VNA
- From: padma gundala <pgundala2001@xxxxxxxxx>
- To: Richard Jungert <r_jungert@xxxxxxxxxxx>
- Date: Fri, 12 Sep 2008 11:07:45 -0700 (PDT)
Thanks Richard,
Have been busy. But will try soon , and let you know
Padma
--- On Thu, 9/11/08, Richard Jungert <r_jungert@xxxxxxxxxxx> wrote:
> From: Richard Jungert <r_jungert@xxxxxxxxxxx>
> Subject: [SI-LIST] FW: Calibration using VNA
> To: si-list@xxxxxxxxxxxxx
> Date: Thursday, September 11, 2008, 2:21 PM
> From: r_jungert@xxxxxxxxxxx
> To: pgundala2001@xxxxxxxxx
> Subject: FW: [SI-LIST] Calibration using VNA
> Date: Thu, 11 Sep 2008 14:21:03 -0700
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> Padma
>
> This is a good start but now try to zero in on the useful
> band of frequencies and things will get much more
> interesting.
>
> I would recommend setting up your vertical graticule for
> 0Db reference near the top of the display for starters. Its
> pretty easy to move up with your dial in the right mode. So
> perhaps move the 0db reference to top of display. There is
> not any useful information above 0db ( no system gain ) so
> why waste 1/2 the graticule on blank info? Try to zero in
> on the useful part of the spectrum and cut out all the dead
> info like below 500mhz and above 3Ghz. I would not sweep
> above like 3-4 Ghz because that is waste of time and space
> in my opinion.
>
> Lets try to sweep 500Mhz to 3Ghz and set the vertical grid
> lines up for 5db/division instead of 10db. This is going to
> stretch it out vertically AND display response around and
> thru the useful band of frequencies.
>
> I do see some real interesting data I'm guessing around
> 2Ghz. What is special about 2Ghz or near there in the
> device you are testing?
>
> Also, I would test only S21 and S11, insertion loss and
> return loss, AND plot both of them on the display
> simultaneously for starters and turn off all the others.
>
> If you can do this the plot will get much more useful and
> the sweeps will go much faster because we are cutting out
> the wasted info.
>
> Richard Jungert
>
>
>
>
>
> > Date: Thu, 11 Sep 2008 07:09:22 -0700
> > From: pgundala2001@xxxxxxxxx
> > Subject: RE: [SI-LIST] Calibration using VNA
> > To: r_jungert@xxxxxxxxxxx
> >
> > Hi Richard & others,
> >
> > I have attached the screen shot (photo).jpeg for the
> load calibration.
> > However, even, at thru calibtaion the curve of the
> loss looks chop
> > ed heavily,of course the line straighter closer to 0db
> and when I look at the smith chart format, the circle must
> spiral with smooth lines to show attenuation. however it
> looks again a messy spiral.
> >
> > So do you think I have made some mistake in my
> settings for the VNA?
> >
> > Thanks,
> >
> > Padma
> >
> >
> > --- On Tue, 9/9/08, Richard Jungert
> <r_jungert@xxxxxxxxxxx> wrote:
> >
> > > From: Richard Jungert
> <r_jungert@xxxxxxxxxxx>
> > > Subject: RE: [SI-LIST] Calibration using VNA
> > > To: pgundala2001@xxxxxxxxx
> > > Date: Tuesday, September 9, 2008, 5:38 AM
> > > Post it in the freelist too. I am curious what
> others have
> > > to say on this front.
> > >
> > > thanks
> > >
> > > richard
> > >
> > > > Date: Mon, 8 Sep 2008 17:30:34 -0700
> > > > From: pgundala2001@xxxxxxxxx
> > > > Subject: RE: [SI-LIST] Calibration using VNA
> > > > To: r_jungert@xxxxxxxxxxx
> > > >
> > > > I don't have the camera today.I will try
> to take
> > > one tomorrow and probably post it later in the
> eve.
> > > >
> > > > Thanks,
> > > > Peter
> > > >
> > > >
> > > > --- On Mon, 9/8/08, Richard Jungert
> > > <r_jungert@xxxxxxxxxxx> wrote:
> > > >
> > > > > From: Richard Jungert
> > > <r_jungert@xxxxxxxxxxx>
> > > > > Subject: RE: [SI-LIST] Calibration
> using VNA
> > > > > To: "padma gundala"
> > > <pgundala2001@xxxxxxxxx>,
> > > si-list-request@xxxxxxxxxxxxx
> > > > > Date: Monday, September 8, 2008, 2:31
> PM
> > > > > Peter.
> > > > >
> > > > > Can you take a picture and send me the
> picture of
> > > what that
> > > > > looks like on the VNA screen? Send the
> Picture
> > > file and I
> > > > > will try to diagnose it.
> > > > >
> > > > > Richard Jungert
> > > > >
> > > > > > Date: Mon, 8 Sep 2008 14:26:10
> -0700
> > > > > > From: pgundala2001@xxxxxxxxx
> > > > > > Subject: [SI-LIST] Calibration
> using VNA
> > > > > > To: si-list@xxxxxxxxxxxxx
> > > > > >
> > > > > > Hi,
> > > > > >
> > > > > > I'm doing a differential
> insertion loss
> > > > > calibration using a VNA.
> > > > > > I get the expected loss line curve
> for open
> > > and short.
> > > > > > However for load , the loss curve
> is not
> > > smooth, it is
> > > > > chopped throughout.
> > > > > > Can anyone tell what could be the
> reason.
> > > The 50ohm
> > > > > load and thru loads are from the CAL
> KIT.
> > > > > >
> > > > > > Appreciate any thoughts !
> > > > > >
> > > > > > Thanks,
> > > > > >
> > > > > > Peter
> > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > >
> > >
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