Using the NanoVNA to measure standing wave ratio (SWR) of an antenna.
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- Опубликовано: 25 июл 2022
- Kylie Lamoree, Motus Biologist for Bird Conservancy of the Rockies, explains how to use the NanoVNA to measure the standing wave ratio (SWR) of an antenna.
In this video, Kylie describes how to calibrate the NanoVNA to measure from 432MHz to 436MHz, saves that calibration, and measures the SWR of a Laird YS4306 yagi antenna. This antenna is used on our Motus stations to detect tags that transmit at 434MHz (manufactured by Cellular Tracking Technologies).
You can follow the same steps to calibrate the NanoVNA to measure from 164MHz to 168MHz, and save that calibration in a different save slot. This will allow you to measure the SWR of an antenna on your Motus station intended to detect tags transmitting at 166.380MHz (manufactured by Lotek Wireless, Inc.). Saving the two different calibrations allows you to easily move back and forth between the two frequencies to measure multiple antennas at your Motus station.
For more information about the NanoVNA, visit their official website here: nanovna.com/
For more about the Motus Wildlife Tracking System, check out the Motus website here: www.motus.org/ 
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oh wow, i never expected a woman to know anything about this, what a miracle
Just bought one and watched several videos by big ham radio channels, and this was the clearest and most concise demo I've seen. Everything I needed and nothing I didn't. Thanks!
Agreed
Loved the voice too
Thank you very much! I have seen several RUclips videos, but nothing has been as clear and concise are your presentation. I’m going to be using it for my home-brew HF ham antennas.
WOW! Great video! You explain things in easy-to-understand simple terms, and not in Klingon.
Perfect introductory video. Didn't assume any prior knowledge, but at the same time without talking to me like I'm a spongecake. Thank you!
PS - Did you know about connecting the two ports together for the "through" calibration? Hope this helps.
I just got my own NanoVNA and trying to learn how to use it. Very straightforward. Thank you for this video.
incredible good explained, thank you .
One of the best tutorials - short and clear!
Thanks!
I like the speed of your commentart - my adhd thanks you.
That was INCREDIBLY helpful!! Thank You!
During your calibration I observed at marker 3:48 in your video that you directly pressed the Calibrate button after the CAL button. Between those two the RESET button has to be pressed to empty old calibration data.
For a 1 port calibration you may skip the Isolation- and Thru button.
After you removed the CAL load from CH0 I saw a swr value of 1.37 at the cursor. Where was that value coming from? Because with an Open (or nothing connected) at CH0 this value should be very high (infinite theoretically). So the yellow trace had to be on top of the display. I hope this helps.
Wow you saved me with your "shiny for short" I was confusing the load with it and I couldn't make it work
The best video I've seen on this subject! Thank you
Thanks for the upload
Thanks - this was quite helpful.
Fantastic video and well thought out. I got a Nano VNA for Xmas, but now confused as to how I delete stored data that I no longer want...thanks.
Very nice, I'm wondering can this test be performed through an LMR 400 coax cable with an LNA & BPF connected, no antenna. Would that still provide an accurate SWR or would I need to add in a 50 Ohm terminator on the input end of the LNA (from the antenna)? Or should this test get performed with the LNA assembly connected to the antenna? This is for a Radio Astronomy telescope project.
How do you know which SWR reading is good or bad for the frequency range you choose to save? I can only assume you are connecting the Nano to the wire that connects directly to your antenna outside with no other equipment attached to get it's SWR?
Hello!
It's my question that how we can test an antenna for a bipolar monopulse uwb signal for example if that signal has a 5ns width and 100khz repetition..What is the frequency that I have to use as start and stop on nanovna to measure my antenna parameters?????
Excellent video. Thanks. KE0UWN
dummy load antenna test ???
Yeah probably. No antenna would give you low an SWR.
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Well said, I am impressed