Re: New version of NanoVNA-Saver: 0.2.1
|
Hi Eric and Ady
There is also the lazy way if you know what type of cable you have between equipment and the antenna Use a time domain method to find the cable length (You need to know the cable VF) and then measure with the NanoVNA from the equipment into the cable save as s1p and import to ZPlot. The transpose the length of cable towards antenna and remember to select the cable type and you see the antenna impedance compensated for loss in the cable. Kind regards Kurt -----Oprindelig meddelelse----- Fra: [email protected] <[email protected]> P? vegne af erik@... Sendt: 6. december 2019 17:38 Til: [email protected] Emne: Re: [nanovna-users] New version of NanoVNA-Saver: 0.2.1 I'm not an expert but this is what I understood: Zplot is able to determine the impedance of the feed cable (if different from pure 50ohm) It also is able to calculate the frequency dependent loss This will help you understand what power goes into the cable and what into the antenna. When you calibrate at the end of the feedline you ignore the cable. When ignoring the cable (apart from the compensated delay) is ok, calibration at the end of the feedline is ok -- NanoVNA Wiki: /g/nanovna-users/wiki/home NanoVNA Files: /g/nanovna-users/files Erik, PD0EK |
Kurt Poulsen