On Mon, Apr 27, 2020 at 02:41 AM, Roger Need wrote:
Here is a second report on the effect of calibrating the NanoVNA on SWR and
Return Loss measurements. This time a 20M dipole was used as the antenna. It
was surprising to me to see how good the measurements were when using the
default 50 kHz. to 900 MHz. calibration and setting the Stimulus range to 13
to 15 MHz. Interpolation works well under certain conditions.
I have made a *table* to better see what is the result of the measurements from the PDF file.
Calibration MHz Scan MHz SWR RL dB
0.05 - 900 1 - 30 1.20 20.56
1 - 30 1 - 30 1.19 21.12
0.05 - 900 13 - 15 1.12 24.42 good result for practical use
1 - 30 13 - 15 1.12 24.74
13 - 15 13 - 15 1.12 24.67
14 - 14.35 14 - 14.35 1.12 24.74
*Result* : A full span calibration is sufficient for practical use.
How smaller the scan width, the better the SWR / Return Loss.
73, Rudi DL5FA
