开云体育

Just for additional information, I was doing the testing in a large conference room with very little in the room other than a table with chairs and a video projector pointing at a whiteboard. It isn't

Hi Ron, Nice results and they look reasonable. The handheld radio with the unit near or on the body or simply placed on a isolated table would IDEALLY show no difference! Alas, that is NOT the

The "rubber duckie" sort of antennas as well as other shortened antennas for hand-held radios are always difficult to measure because they are sensitive to their surroundings as well as the size of

Sorry guys (and any gals). I re-calibrated the NanoVNA with the calibration devices I got with my AIM 4170D and now the SWR trace looks fine. I'll have to use the 4170 on the devices that came with

Wim, Some one previously pointed out that the deepspace demo kit is not the one shown in the nanoVNA-F photos. The nanoVNA-F demo board can be bought for around $25.00 on

I am new to playing with any type of antenna analyzer/vector network analyzer device but decided to get started learning by purchasing the NanoVNA, as it was relatively inexpensive. The display on the

I got my NanoVNA today, calibrated it, and displayed the SWR for my 40m half-square. Here's a comparison of the results with the known SWR using an AIM 4170D. Any ideas?

Hi Ron, interesting data, and an interesting use case! My limited experience with antennas for handheld radios indicate, that they do change their impedance based on whether a person is holding the

The RF demo kit can also bought via Ali-express or

qrp.ddc, I ran Salil's latest script on the s1p file you attached and it runs O.K. The only change I made to his script was substituting your filename as follows : cable =

Did you install the modified firmware?

From: qrp.ddc@... I also have similar bridge from aliexpress (blue board), it needs to install two jumpers near resistors in order to work. It has directivity about 40 dB at HF, about 35 dB at

Thank you. I have been having problems with my MW&RF account login (I'm waiting for a response from them) and have been unable to get a PDF until now. DaveD

my NanoVNA has S21 dynamic range at about 70 dB. Below 300 MHz it is usable down to 90 dB with some noise. From 0 dB to 50 dB it has almost straight line with attenuators. 60 dB has a little

I also have similar bridge from aliexpress (blue board), it needs to install two jumpers near resistors in order to work. It has directivity about 40 dB at HF, about 35 dB at 100 MHz and about 25 dB

I opernes it up and no battery but it has solder pads for a battery. It does have the metal shields so I will probably keep it and buy a battery or use an external pack. Mike N2MS

Salil, could you please check your script, I tested it with different cable sequences and script doesn't works at all. It just shows random figures. For example here is RG316 followed by RG6U followed

Scroll to the bottom and click on the App note link and you'll get your PDA copy.....

But they do have some models without batteries. You can see a small foil bag inside the unit usually just below the Right front corner beneath the "NanoVNA stamp" if you have one. It there is a

Here ya go!!! https://coppermountaintech.com/measurement-of-electronic-component-impedance-using-a-vector-network-analyzer/ BY THE WAY.... THESE GUYS HAVE BEEN AROUND FOR ABOUT 8 OR SO YEARS. I