[SI-LIST] Re: Calibration using VNA
- From: padma gundala <pgundala2001@xxxxxxxxx>
- To: Richard Jungert <r_jungert@xxxxxxxxxxx>
- Date: Thu, 11 Sep 2008 07:16:53 -0700 (PDT)
> To: "Richard Jungert" <r_jungert@xxxxxxxxxxx>
> Date: Thursday, September 11, 2008, 7:09 AM
> 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 choped 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 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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