Thanks for the video. I needed a refresher as I am trying to tune shark ham sticks on my truck. The sun is washing out the nano-vna and I need to place an umbrella under it. I do love having a network analyzer that fits in my pocket - never thought that would be possible remembering the big units they used to use at work. All the best, 73 de KI5HXM
Thanks for the very straight forward refresher on the NanoNNA-F. I purchased several yeas ago and just pulled it out again. The device is amazingly accurate. Also thanks for the calibration info.
I think the closest that I came was about 25' to them. With a taller antenna, I would have moved farther away. It is a good reminder though to always be cognizant of the power lines. Thanks!
Glad to hear you are enjoying your new purchase. If you've been in this for 48 years, my guess is that you've had some other excellent equipment along the way.
Assuming you calibrated the original freq. range, when you changed to 7.0-7.3 is it safe for us to understand that no recalibration is needed as it was within the original range? Thanks for the video.
So, if you're looking at 40M, and you want 7.123 to be at the lowest SWR, but the swr is higher at that frequency than you want it, do you decrease or increase the antenna length (and then check the SWR again)? Thank You!
Hi. Interesting. As a newbie, I have a question. Because we are not transmitting when we use the Nano VNA. Couldn't you leave it on and go shorten or lengthen the whip while watching "live" the changes to the SWR...? Peter Hume ON3VCF
Kudos to you for even mentioning that you need and adapter. I have watch half a dozen videos on the NanoVNA and how to use it for ham radio and NONE of them show an adapter or even mention. Its like the device just magically connects to the feed line.,
I like to use a 6 inch flexible lead on my Nano to keep stiff cables from being hooked directly to the circuit board of the Nano. Have you tried calibrating to the end of the feed line? I did a 6 ft jumper yesterday and it worked fine. 6 ft is not nearly long enough for most antenna's though. It might be for a 70cm & 2M dual band possibly just to tinker with on the desk.
You bring up a good point about calibrating to the end of the feedline, and yes, I have done it that way up to about 30' and it always seemed to work fine. I suppose I don't think about it too much though because most of my calibrations of antennas are "close enough" calibrations such that I can work out the details in the practical use. It probably isn't an efficient method, but I don't mind it. Thanks for bringing up this topic - definitely something worth considering in the future. 73.
@@transmittinguntilrobotsrep1045 The reason I ask is that Rig Expert instructions say to calibrate to the end of the feed line essentially moving the antenna analyser to the antenna hiding the coax and at the same time keeping your body away from the antenna. According to Bells cb to know the true SwR of an untuned antenna you have to have calculated half wavelength coax. Coax repeats exactly what's at the other end every half wavelength. He says after the antenna is tuned that coax length no longer matters. I helped tune a new big rig antenna the other day on a 6ft coax with my NanoVna h4 not calibrated to the end until ch 20 was 1.36:1 while 1 and 40 were 1.56 :1. Then we hooked the radio back up to the antenna with his 18 foot coax and the 6 ft jumper with an analog SWR Meter. The the SWR was 3.5:1. On ch 40. We had to cut another inch off the antenna to get the SWR back perfect.
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?????
Hi. Nanovna (display) shows S11 swr 500m/ ... (in the top left corner). That should be 1: .... I have seen that on my nanoVNA as well, but then I changed the scale (I believe) and then it changed to 1:. I am a newbe user and still learning, but I think that is something to look at.
Hello! When you travel across the swr curve with the left and right keys… is it to adjust the steps? For instance, i find that mine goes from 7050 to 7150 or so… Thank you
Hello Diogenes. If you are asking if it is possible to adjust the incremental steps, it is. The NanoVNA always pulls about 100 reading points, so in order to adjust the width of the steps between movements with the left/right keys, you change the start and stop frequencies. By decreasing the amount of spectrum that the VNA is observing, you are able to get more refined steps between the start and stop frequencies. If I've misinterpreted your question, I apologize. 73. AC3DS
I’ve heard and read that you are supposed to calibrate it each time you use it, however I have actively tested (days and weeks later, outside to inside, etc...)to see if there is a measurable difference and haven’t found any difference. I believe that you should recalibrate when the frequency range goes beyond the bounds of the most recent calibration, or the calibration used to save into one of the recall slots. For my NanoVNA, there was no appreciable calibration change difference until I got over 500MHz, so it has been one calibration that worked for me.
At HF it doesn't really matter. It matters once you start going into VHF and UHF frequencies. Also technically you should calibrate at the end of your feedline, but again at HF it doesn't really matter. You're only looking for a dip. You might get better results using S11 logmag instead of SWR.
Hi David, thanks for commenting. There seems to be differing understandings about this in the community, and I don't claim to be fully sure that I'm correct. I could certainly be wrong about this, but through experimental testing, I have not been able to validate any significant effect of not calibrating each time when the most recent calibration was for within the same broad range of the spectrum (HF, VHF, UHF)... The difference between broad ranges is also very minimal such that I don't always recalibrate between them if the original calibration included the new stimulus range. I would be curious to see what the actual numeric offset (calibration amount) is between the bands. 73
@@transmittinguntilrobotsrep1045 No, he's right. You should probably have some sort of protection in place, as is shown here: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-totwu4IbavE.html
You're not going to include ANY advice as to including circuit protection between the NanoVNA and the antenna? The problem is that it's fairly common for newbies to fry their NanoVNAs, so in a video like this, you should at least include a link to a video that shows them how to do this.
Yeah, the unit doesn't come with adapters, so I felt like it was necessary to say, but I get it. Being comprehensive is sometimes at the expense of brevity. 73
@@transmittinguntilrobotsrep1045 Based on solely what a vna is, I feel like there is a certain level of competency needed to be able to properly digest these videos, and understand the content correctly. So going into depths on what an adapter is, in my book paints a bad picture for the rest of the video.
