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- Опубликовано: 2 авг 2019
- Episode 350
vector network analyzer
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/ imsaiguy
see a large expensive VNA here:
• #268 using a vector ne...
update to calibration:
Reset
Cal
attach open SMA to CH0 - OPEN
attach short SMA to CH0 - SHORT
attach 50ohm load SMA to CH0 - LOAD
attach 50ohm load SMA to CH0 and CH1 at same time - ISOLN
attach cable(s) to both CH0 and CH1 to create RF path between - THRU
DONE
SAVE
using 50ohn loads on both channels for isolation cal lowers the noise floor
SPECS
Number of Calibration Points: 101 (Fixed)
Number of Scanning Points: 101 (Fixed)
Display Tracking: 4, Marking: 4, Save Setting : 5
PCB: 54mm x 85.5mm x 11mm (without the size of connectors, switches)
Measurement Frequency: 50KHz ~ 300MHz (50KHz -900MHz, enable extended firmware)
RF Output: -13dbm (maximum -9dbm)
Frequency Accuracy: 0.5ppm
Measurement Range: 70dB (50kHz-300MHz), 50dB (300M-600MHz), 40dB (600M-900MHz) enable extended firmware)
Port SWR: 1.1
Display: 2.8 inch TFT (320 x240)
USB Interface: USB Type-C; Communications Mode: CDC (Serial)
Power Supply: USB 5V 120mA, built-in 400mAh electricity, maximum charging current 0.8A
A very informative video on this product which will help me understand how it works when mine arrives tomorrow many thanks keep the videos coming.
Thank you for the videos...they are easy to see what you are doing....understand...keep them coming!
I bought one myself too, and it's really convenient to test filters and antennas
This was a good, short review of reading a smith chart. Saving this video for later.
I'm sold. Looks like great value. Ordering one today.
I could really use one of these, thanks for the informational video!
So far so good. I really like it. I got mine new off ebay for less than $46 with shipping and all the attachments in a nice case. Took about 4 weeks to arrive. Takes about an hour to map it all to your brain intuitively. Use a blunt pen as a stylus. If it is sharp, it won’t drag the cursor.
Thanks alot. Ordered one!
Great demo. Thanks, KU3X
12:28 A few problems with the calibration that are worth to mention.
1.) A calibration should be done for each different setup (different cables, different adapters, with or without cables or other changes). The reason is to eliminate everything between the device under test and the VNA.
2.) An open SMA connector is not an open, the center connector is recessed and behaves differently. So use the open from a cal-kit.
3.) Isolation and through can be skipped if it is only used as an antenna analyzer (S11 measurements).
4.) If you want to use both ports (i.e. measuring a filter), the calibration should be done with the two cables and all adapters that will go to the device under test. And if the device under test has 7/16-DIN Connectors, you are supposed to have a calibration kit for these connectors too. (Or you just assume your adapter-stacks from 7/16-DIN to SMA are perfect... It is also very unlikely if you have equipment with these connectors, that you are using this gadget instead of a real VNA) ;)
I just bought the NanoVNA as a cheap pocket-antenna-analyzer and it works for this purpose. But there are different versions of it. My NanoVNA has no shielding and the LEDs are green instead of blue.
My LED is Orange❤😮😊
GREAT little gizmo and U cant beet the price ! excellent for learning about VNA's without spending tons of $$$ TNX 4 the upload !
73 N8AUM
HP 8410 owner/user here ... still have a couple that work. Equipped with S-Parm test set and the 2 - 18 GHz Transmission-Reflection Test set too.
Thanks for a great overview of the NanoVNA. You mentioned that you worked at Wavetek. I worked for Wavetek (San Diego) in the late '80, if memory serves, for a couple of years as a contractor. Among other things, I wrote the automatic calibration code for the 650 2MHz Variable Phase Synthesizer. The designer and boss was Bruce Gould. In my 45 years as an engineer, this was *_the_* best work experience. Looking back, I learned what made it such an enjoyable experience.
1. The project had a single focus in the design and execution due to the designer/project manager, Bruce Gould.
2. Even under the pressure of upper management, Bruce kept us insulated from that pressure.
3. The product was successful because Bruce had put the right set of features together to create an instrument that customers would want.
It is one of the few projects that I worked on that produces a product that had quite a good run. I see that used models still selling for pretty good money. I think the original price was about $20K. Now I see them offered for over $3K.
The big selling point of this function generator was that it could control the phase between it's three outputs with a high level of accuracy. When tested by the National Bureau of Standards, it was shown to be more accurate than their test equipment could read ... and that was only up to 100 KHz. The 650 was capable of generating signals up to 2MHz.
Well, just a codger reminiscing about the good old days. Thanks for listening and for a great channel. *SUBSCRIBED!*
Oh, and I had an IMSAI too. That came after I built an Altair 8800 my senior year in university. We have a few things in common.
I think I interviewed with Bruce when I got promoted to R&D manager. From your description he sounds like the perfect boss. I had a great boss at Wavetek too. I remember one advice from Bruce about managing engineers (herding cats). He said if I needed everyone to attend a meeting, bring food
Every time you fit the calibration terminations, the pin rotates in the skt, so will be inclined to wear. If I get one, I'll be fitting SMA to BNC connector-savers, and locking them with a tiny paint-spot. It will be easy enough to re-calibrate to BNC and last a lot longer.
I've had one of these for a while now and decided to get the larger screen model (NanoVNA-J4). Easier on the eyes as I become more mature (older!). I worked at WaveTek back in the mid-70's with Mike Walters, Jim Fish and a few others whose names escape me at the moment. Worked there while attending evening college (San Diego City College) and found both to enhance each other. Good place to work at back in the day. Motivated me to get my HAM license and build much of my own equipment. Still have one of the Model 164's that I actually calibrated back then. Found a model 172 on ebay that was cal'd by Mike Walters (had his cal stamp on the main board). Nice presentation on the NanoVNA!
Does this measure both voltage and current for SWR ?
Thank you for your videos demonstrating use of this slick and affordable portable VNA - I now have one on order! Your followers might find it interesting to see how accurately it measures purely resistive dummy loads of various values ranging from 5 to 2000 Ohms at HF, VHF and UHF frequencies. Accuracy away from nominal 50 Ohms is significant for designing matching networks. High Zs at RF are particularly difficult to measure accurately.
I'll do some measurements
here are measurements
ruclips.net/channel/UCzxHDi9lhMwiG4XKzlJKy5w
Really nice video. I assume the various saves let you calibrate it for say 140-150 and 425-450 and switch between them without calibrating each change. cool. and so tiny.
Great video. Could you explore making one discussing the pc software that works with it (python language). I believe it offers export options for traces and scans.
I really need to look at this little toy. I have a MegiQ VNA at work, would be nice to check how good this thing is.
All evidence points to SA612A mixers being usedand those mixers work up to 500 MHz. The si5351a clock generator is specified up to 200 MHz.
At this point I am very curious to see how they go up to 900 MHz.
You may find that you get a better behaviour from your antenna if you hold the NanoVNA in your hand. HT antennas generally expect the operator to be part of the ground-plane.
yes, rubber ducks are hard to measure. they vary on how you hold them and if they are horizontal or vertical.
At Heathkit, a pie-plate sized aluminum disk was used ... this allowed an equal-footing to be established when a different antenna was being tested.
Convinced me - I just ordered one :)
How accurate is it? Did you cross reference to any other analyzer to verify?
kewl toy,,,getting some , man,,, thanks
Hi, great explained, may I use this nano it for calibrate a vhf duplexer 5,0mhz split? Thank you for all.
I think so. the calibration is only 101 points so make sure you calibrate it over a narrow rangle for better accuracy.
Careful, a lot of these being sold now do not have built-in batteries due to shipping restrictions. I found a seller in California however there was able to ship it to me (one that has a built-in battery) for $44 !
Interesting tool. I just checked Amazon and they have a number of these by different maker and prices from $35 to $75. How do you determine which are good and which are poor knockoffs? Thanks
I don't know. It seems the white ones came later so they may be questionable.
My unit is very annoying and comes up with a speghetti like jumble of lines on the screen when it's turned on and there is nothing that tells what any of the lines are. Also the toggle switch for the menu works intermittently. Has anyone figured out what the second port does and how to use it?
I just started playing with my NanoVNA. My old eyes wish the display was larger, but for $50 I can't complain. The touch screen and fragile scroll wheel interfaces are cheesy and slow to respond, but again... fifty bucks. Thanks for demonstrating some of the undocumented user interface that wasn't intuitive to me.
PS - 50 BUCK VNA!
I just ordered one from ebay for about $48, coming out of California. Heard some were bad and hoping I get a good one!
I have seen online where there is software for your computer to interface with this, bigger screen! I'll probably be checking that out more myself - at 70 with cataracts I assume I'll be having trouble seeing it too!
Will this measure the frequency of rfi interference? Is there a better device that would do that to see what frequency rfi my solar install with solaredge optimizers/inverters are generating?
No. you want a spectrum analyzer
ruclips.net/video/n6WEM3--Npc/видео.html
here it is measuring RFI
ruclips.net/video/nn14JNxNT1Y/видео.html
I have one and use it working with my tablet, to have a bigger screen.
Can this NanoVNA be used as Spectrum Analyzer ? E.g. measure filter settings, cut frequencies etc. Two SMA and print under them look promising... Thanks.
I have several videos sweeping filters. here is one
ruclips.net/video/f-qJIjaFIrs/видео.html
I got a question ( this video popup on the home page), i wanna switch a clothing iron, but using a chikit/Faburino 32 bit processer.
gonna use a bridge rect and make DC to operate the clothing iron.
ST901T, this is the second on the list at mouser, a darlingto.
to me it seams it handle 5 Volt emtter/base coltage.
Would you consider this a adequate device for the task?
... and using DC, what capacitor values for around the bridge rect would you suggest me?
4700uF?
some guy, called luis here on tube build a PCB soldering device using a clothing iron with an Arduino and thouchscreen solid state relay (DIY Reflow Plate with an old iron - Luis Geissler).
But i wanna use dc to pulse it MCU.
I would use a mosfet not a bipolar
@@IMSAIGuy well, the only times i used "fets" is for musical circuits.
witch Mosfet would you choose, ST, Texas Instruments, renesas, Diodes, MAXIM, NXP(Nexperia), etc
the transistor seams more obvious as a switch, more or less.
i have 5 volt logic from a 2sc945 trannie connected to a Fabuino(arduino).
Would you build a circuit like this to make a video?
What type of capacitors you needs for 220V bridge rectified to 308 Volt, 4700uF / 100nF(parallel)?
i got a pre 2000 Tektronix, much older than your scope, would ya? using your clothing iron ..... no need to cut the plug or modify it.
What it takes to heat the clothing iron to 225ºC and a correct rectified stabler DC voltage.
@@AnalogDude_ Sorry, I don't have time and I don't like doing high voltage circuits on RUclips as they are very dangerous and I don't want inexperienced people trying to duplicate what I do.
@@IMSAIGuy Hmm, you can die or get lifelong paralyzed just walking on the sidewalk, in fact today i saw a elderly lady trip over her feet and almost fell on the side walk.
We all here have a device in the fuse box of our homes (or multiple) if you touch the phase wire the power gets shut down instantly ( if there is difference of 30 mA between phase and neutral), it's called differential in some countries. just before current get dangerous for your heart.
Just put a disclaimer.
@@IMSAIGuy wiki: Residual-current_device
brands:
Schneider-electric
Merlin Gerin
Siemens
ABB
EATON
get one via European online store and you never have a problem mains grid.
I ordered this, and I would like to know more about thing that can be done with it.
I bought one to get the motional parameters of a quartz crystal.
I loved it - will order one - I wish there is for 1.090 GHZ
There is a new one that will go to 1.5GHz
@@IMSAIGuy thanks, is it the same and you upgrade the software or different hardware?
@@webandmedialb different hardware. Get the NanoVNA-H 4
@@IMSAIGuy Thank you - will do
Can you use this device as a spectrum analyser or as a signal generator in some way?
no for spec anal. minimal for signal generator. will output a signal from 50khz to 300MHz. square wave with harmonics
could you do a 440 yagi i tried on a cushcraft A430-11S and the swr is crazy
I don't have access to one.
Thanks for nice tutorial,
I just started studying RF, have a one basic question, please correct me if my question wrong. doesn't such mini VNAs require direction coupler?
No. Inside the VNA the coupler is built in. To be accurate, a coupler is not used, it is a return loss bridge. See my video #363
You said AMM like 140 Times In This Video.
I should make a spoof video out of this and count your AAMMS :D
does this device messure group delay over frequency?
yes
Sounds like he is talking to himself instead of us....and I wish I had a dollar for every "umm." Still, a fairly good primer on this machine. I had already ordered one, and this video makes me more confident that I have made a good purchase.
Roy&Shashi Brock
I agree. Absolute expert but that is the way with technologists, scientists or other experts.
They know their science inside out and a whole lot more besides. However, they assume that the person listening, already knows.... They do things too quickly, some actions with no explanation and
worst of all, they do not prepare their talk.
Genius Techies or Scientists but clueless about presentation or communicating with their audience!
He had no idea what he was going to teach when he started out and just made it up along the way.
Other specialists would listen and understand everything, complimenting him of the video because they already knew.
Nevertheless, very encouraging to look into the device further.
Unless I missed it, can you use it as a precision frequency meter?
frequency output only
@@IMSAIGuy . Thank you.
"Blue LED" at 2:48. Yeah, how does it "tell" you if it's good or bad? Solid/blinking = ??? Sorry, gave up half way through...choosing menu options too quickly to follow without explanations. Thanks for trying.
Just received min yesterday. If there is an internal battery, it appears dead. Works using power from the USB port, but will not charge the battery. Video shows no battery connected, so maybe mine is defective? Will try some more tings and report back. Nice package though.
IF the battery is dead, and they used a battery supervisor IC, you may have to contact the battery itself to get it charged some initially .. I've got some old Li-ion cells with integral BMS ICs and I have to 'jump start' them that way if they are too low or discharged.
Let's see: 500 kHz to 900 MHz span gives 899.5 MHz span. But screen is 4.5 major divisions wide, not 5 major divisions wide. So span per major division is 899.5 MHz/4.5 = 200 MHz/major division. So okay, meets Engineering 101 requirement that linear graph horizontal scale should always be 1, 2 or 5 x 10^n multiple (to 3 significant figures, at least). Planned it that way, right? Nice video, very helpful.
wouldn't you want to put on a mouse tail counterpoise for accuracy?
The good antennas seemed to measure just fine. Being handheld it acts just like an HT in conjunction with the capacitance of the body. Seems like a much better tool for designing ducks rather than a rackmount VNA.
My friend paid 80 for same one on Amazon. Did he get ripped? It works well
he paid way too much unless it is the big screen model
You said you have a friend with a real VNA. I would have been nice if you could have compared results between the two to get an idea of how good it is.
I wanted to but then Covid hit. I have not been able to visit him. Here is his unit: ruclips.net/video/_bRpnTyV0LU/видео.html
@@IMSAIGuy I see.
I left the antenna industry 2 years ago, but then recently found an interest in making my own antenna and then realized I no longer had the equipment at my disposal. A simple antenna for home use doesn't really require the kind of precision I needed at work, but it just seems impossible that you can buy for $80 what cost my employer $80,000. Wanted to know if these thing were legit.
@@ProfessorOzone Yes they are legit. They only work to 1GHz so that makes it much easier design. I've used those 80k units too. this one is quite good for the frequency range. you will be happy for the price. my friend with the 'real' VNA bought two nanos and actually uses them for real work.
@@IMSAIGuy That's great to know, but the
v2 appears to go to 3GHz, which is great for 2.4 GHz stuff.
There's a book on this device that seems to have just came out available on Kindle, www.amazon.com/gp/product/B083BB82G5/
also get oscillo toy too in this format,,,
Can this be used for 140 Mhz frequency?
yes
Review Cover or Case (Чехол или Корпус) for Nano VNA: ruclips.net/video/zbeGyNkHfyg/видео.html
Mines on order, thanks. ZS1RJQ
Can this VNA has printing capabilities?
you can print from a PC: ruclips.net/video/zw7Dp1nwvD8/видео.html
@@IMSAIGuy Thanks
AAAMMMMM
Link to Purchase ???????????
www.ebay.com/itm/Nanovna-50KHz-900MHz-Vector-Network-Analyzer-UHF-HF-VNA-UV-VHF-Antenna-Analyzer/283552544231?hash=item42050c75e7:g:lzIAAOSwS4ddMMTc
TNX.
maybe this will replace my HP 8754 and normalizer
Good when the 8754 won't fit in your pocket :)
I ordered one.amazing little gadget
Sex, type connectors on unit ?
The NANOVNA has female connectors and the calibration standards are male.
TNX 73
The uh's got to me, had to leave.
uh ......... goodbye 😎🙋🏻♂️
Nobody explains IF you use the 2 patch cables on the 2 ports separately, OR, just 1 cable using both ends! Geez. I've seen a dozen videos and no seems to care and explain. Can anyone at least zoom in or zoom out the camera and we will know.
ruclips.net/video/dmCw-iKLd44/видео.html
Sure would be nice if you edited out some of the useless part, like when you were setting up the shot with the box to block the light... I got bored and left at that point.
Too damn small...
the 4" version is better. but still small
Very much Talk better Paul Carlson showed it❤
All good video, But Can You Stop Saying AAAMMMMM.
Makes The Video UnWatchable
You dont need to talk alll the time. When you dont have nothing to say, Be silent, Dont say aaammmm, Its sooo anmoying,, I wanted to enjoy the video and content, Bit i just was not able to do so. Minutes in video i banged my head against the wall
Again, When you dont have shit to say, Be silent.
Talk only when it means something, Stircly business.
We dont want to hear you lost your pencil and AMMMMMM .. :D :D
AAAMMMMMM
Sorry, I just do that, I won't be getting any better so you might want to watch another channel.