On Thu, Jan 9, 2020 at 09:50 AM, Klaus W?rner wrote:
I've screenshotted the Number 8 and 10 of the new version (serial LC and L):
The capacitive parts at the bottom are good, but the top side isn't it. The
measurement with the professional equipment are similar.
Hello Klaus,
Thank you very much for providing the screen shots.
I have made two measurements with *Test field 8*.
1. In Test field 8 the inductor looks like to have nominal 470 nH.
If you accept a tolerance of +/- 10 % = 423 - 517 nH,
the usable frequency range is measured to 3.4 - 126 MHz.
Above 394 MHz the inductor becomes capacitive.
See nanoVNA-Saver diagram: RF-Demo-Kit_8-470nH_Saver.png
2. A comparable measurement with the semi-professional FA-VA5 and VNWA software.
If you accept a tolerance of +/- 10 % = 423 - 517 nH,
the usable frequency range is measured to 1 - 128 MHz.
Above 375 MHz the inductor becomes capacitive.
See VNWA diagram: RF-Demo-Kit_8-470nH_VNWA-VA5.png
In my understanding both diagrams show *comparable results*.
Comparing with your screen shot of *Test field 8* I assume,
that you did not made a *Calibration* with the RF Demo Kit *Test fields 13-15*.
73, Rudi DL5FA
