I forgot to mention that when changing measurement ranges you should re-do the calibration, I wasn't looking for perfect measurements (just approximate ones) so I didn't spend time doing that in this case.
Absolutely! I was able to find a repairable HP 8753A VNA and an HP 85046A S-Parameter Test Set on eBay for reasonable prices but they are few and far between. Now that you have one you will find quite a few uses for it.
@@tautech8196 No need Rob, I'm not that heavily into them, yet! The professional VNA's are worth a fair bit of money, so as I said I'm not expecting to be gifted one by any manufacturer any time soon, maybe once I get to 50,000 subs or something, so maybe in 10 years.... LOL.
Antenna resonance frequency and impedance matching are two different things. An antenna is resonant where reactance is 0 (+jØ), which can be different than where impedance is matched, e.g. 50R.
@@TMS5100 Sorry, my bad - I meant "using the nanoVNA" - I've spent enough on tools for this month :D I'm looking at the nanovna menus now and see there's a trace format for reactance too. I'd assume then, that I'd set that trace up, and find the frequency where that's zero? I assume that the impedance should match there as well, or not necessarily? Should be close anyway?
@@notsure7874 lowest SWR can be considerably off from where the antenna is resonant. people freak out about "high swr", but even swr of 2.0 means power loss of only ~10%.
The title of your video is Find Antenna Resonant, my question is if the same principle can be applied to antenna traps. I just bring down my TH3 to clean-up and fix one of the 15meters trap and now I'd like to check if all the traps are Resonant to the frequency they belong?
Thanks for the great video! I am sorry that I bought the analyzer before poking around UA-cam, or I would have used your purchase link. I am working on a LoRa mesh network and only recently found out how many bogus antennas there are. Your video and this device should help me screen out the junk and improve the performance of my network.
I've got a nanoVNA v2 on order but till now I have always pulled the cover off all antennas I get to check the length because I can't trust that what's inside is the right type for the frequency its sold for. 433 and 868 are a little harder to check based on length because of the antenna design usually being a normal mode helical but for 2.4 and 5.8 dipoles its piss easy to check them with callipers or a ruler :)
Am i right in thinking that the calibrations that are saved to a slot do not have to be done again and can be recalled if your going to test the same type of antenna with the same range of testing? say for example i will be testing 868mhz, 915mhz and 2.4ghz antennas, i just store each of them into a slot and load the calibration for the correct one i want to test providing the parameters are the same as when the calibration was done?
Andrew Jones - that is a nice option, the bigger screen is definitely a plus if your eyesight isn’t as good as it used to be, although I think there is a firmware update to allow you to add one to this size (the screen just plugs in), I did try a 4” TFT that I have here but it didn’t work without the update.
@@TheDefpom Been following the group for new generation NanoVNA's. Thinking on how to to an affordable full two port version and real time spectrum analyser in the one device. groups.io/g/NanoVNA-V2
I forgot to mention that when changing measurement ranges you should re-do the calibration, I wasn't looking for perfect measurements (just approximate ones) so I didn't spend time doing that in this case.
Buying links are not the official stores, and quite a bit more expensive then official stores. Not sure why these are recommended.
If Antennas are your thing this looks like a must have.
andymouse123 - or even what I used it for, to make sure the antenna you got cheap from China is what it claims to be.
Absolutely! I was able to find a repairable HP 8753A VNA and an HP 85046A S-Parameter Test Set on eBay for reasonable prices but they are few and far between. Now that you have one you will find quite a few uses for it.
VNAs can be very handy and at this price hobbyists can afford them! Thanks for another interesting video, David
David V - I thought that for the money it is stupid not to get one, it’s not like a manufacturer is going to give me a $3000 VNA anytime soon.
@@TheDefpom No not give but i will lend you my SVA1032X now you are venturing into VNA's. :-)
@@tautech8196 No need Rob, I'm not that heavily into them, yet! The professional VNA's are worth a fair bit of money, so as I said I'm not expecting to be gifted one by any manufacturer any time soon, maybe once I get to 50,000 subs or something, so maybe in 10 years.... LOL.
Antenna resonance frequency and impedance matching are two different things. An antenna is resonant where reactance is 0 (+jØ), which can be different than where impedance is matched, e.g. 50R.
So is it not possible to find the resonant frequency? If it is - how do you really find the resonant frequency?
@@notsure7874 Look at my post above. Resonant frequency is +jØ
@@TMS5100 Sorry, my bad - I meant "using the nanoVNA" - I've spent enough on tools for this month :D
I'm looking at the nanovna menus now and see there's a trace format for reactance too. I'd assume then, that I'd set that trace up, and find the frequency where that's zero? I assume that the impedance should match there as well, or not necessarily? Should be close anyway?
@@notsure7874 lowest SWR can be considerably off from where the antenna is resonant. people freak out about "high swr", but even swr of 2.0 means power loss of only ~10%.
@@TMS5100 Yes, and yet, the antenna has maximum performance when the impedance is matched to the antenna at the resonance point, correct ?
Can you detail the settings for stimulus, scale, trace, etc etc. that need to be setup before the point you start at in your video? Thanks.
The title of your video is Find Antenna Resonant, my question is if the same principle can be applied to antenna traps. I just bring down my TH3 to clean-up and fix one of the 15meters trap and now I'd like to check if all the traps are Resonant to the frequency they belong?
Thanks for the great video! I am sorry that I bought the analyzer before poking around UA-cam, or I would have used your purchase link. I am working on a LoRa mesh network and only recently found out how many bogus antennas there are. Your video and this device should help me screen out the junk and improve the performance of my network.
Looks great for tuning ham radio antennas.
Great little device. Quite a bit of info on the EEVblog forum and w2aew channel.
dave odessa - yes I only skimmed the forum, there’s a lot to read there. w2aew has done some good videos on the unit.
I've got a nanoVNA v2 on order but till now I have always pulled the cover off all antennas I get to check the length because I can't trust that what's inside is the right type for the frequency its sold for.
433 and 868 are a little harder to check based on length because of the antenna design usually being a normal mode helical but for 2.4 and 5.8 dipoles its piss easy to check them with callipers or a ruler :)
I would have some use for this to figure out if a certain problem comes from the antenna or not... don’t know how to use it though 🤷♂️
I am bit confused, antennas usually have RP-SMA male connectors and NanoVNA have SMA female, so how does everything works?
You need to set the stimulus first ... ie freq sweep range and then calibrate it.
Does it work with the nanovna-saver or nanovna-qt software?
Which model of NanoVNA is that?
Purchase link in description is broken
Thanks for letting me know, here is the new link: defs.link/?u=57e850f
Am i right in thinking that the calibrations that are saved to a slot do not have to be done again and can be recalled if your going to test the same type of antenna with the same range of testing?
say for example i will be testing 868mhz, 915mhz and 2.4ghz antennas, i just store each of them into a slot and load the calibration for the correct one i want to test providing the parameters are the same as when the calibration was done?
Yes
@@TheDefpom thankyou 😀
Nice, but why oh why couldn't they put it a proper box?
ptronix - Agreed.
To keep price down
What did you set as your span?
I've ordered the SAA-2N version 3GHz NanoVNA which has N-Type connectors and larger 4 inch display in a better enclosure.
Andrew Jones - that is a nice option, the bigger screen is definitely a plus if your eyesight isn’t as good as it used to be, although I think there is a firmware update to allow you to add one to this size (the screen just plugs in), I did try a 4” TFT that I have here but it didn’t work without the update.
@@TheDefpom Been following the group for new generation NanoVNA's. Thinking on how to to an affordable full two port version and real time spectrum analyser in the one device. groups.io/g/NanoVNA-V2
868 MHz? Interesting. LoRa, European spec?
I was wondering why I did not receive notification for the last 7 episodes. Content creators are going to lose viewership over this. @t
Mark Vanderberg - indeed! @UA-cam Creators
these are all clones and don't support the original developers, see nanorfe.com/nanovna-v2.html and groups.io/g/nanovna-users/message/16797