开云体育

Hi Reuter
I had to modify your header to import the s2p file. There was a S too much
! ListType=Lin (This addition was probably not needed)
# HZ S RI R 50 (at the end of this line there was a S too much)
As you see your T-Check is peaking of 50% at 800MHz and should for an acceptable calibration be less than som 5%.
Reason is the your measurements is not error corrected and if you add two 10dB SMA inline attenuator on either side of you T adaptor then it might work
Kind regards
Kurt

-----Oprindelig meddelelse-----
Fra: [email protected] <[email protected]> P? vegne af reuterr@...
Sendt: 5. november 2019 18:10
Til: [email protected]
Emne: Re: [nanovna-users] T-Check for my nanoVNA - Results look excellent below 150 MHz and acceptable up to 300 MHz

On Sat, Oct 5, 2019 at 06:39 PM, <bryburns@...> wrote:

I then used the T-Check equation found on page 12 of the file
"Reeve_S-ParamTestSet.pdf" found at

.
pdf

to compute the T-test result as a function of frequency which is
plotted in the attached ".jpg" file.

Hello Bryan,
I am trying to calculate the T-Check value from the NanoVNA-Saver .S2P file with LibreOffice Calc, but I did not got the T-Check formular adopted.

I then copied S11 to S22 and S21 to S12

This is already done in the attached file T-CheckR31.S2P I attached also a screen shot from NanoVNA-Saver T-Ceck measurement.
The 49.85 Ohm resistor was soldered in a SMA Female-Female Adapter, see attached photo T-Check_SMA-F-F_49.85Ohm_DSC08169.jpg

Could you please explain in detail how you applied the formular?

73, Rudi DL5FA