#313
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День томуSpectrum Analyzers are very useful if you work with radios. Unfortunately, they are very expensive. Until recently, when I saw this small device for around 50$. Unbelievable. But is it any good?
In this video, we will:
- See, what such a spectrum analyzer does and how it works
- Have a close look at this cheap device and compare its readings with a more expensive one
- See the difference between spectrum analyzers (SSA3032X), Vector Network analyzers (N1201SA), and SDR radios
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Links:
Spectrum Analyzer LTDZ: bit.ly/2SPwXSz or s.click.aliexpress.com/e/_d7O... or amzn.to/2LFBHJu
Much better product (TinySA ultra): s.click.aliexpress.com/e/_DdL...
Software: dl4jal.eu/
SMA Attenuators: s.click.aliexpress.com/e/_d62...
Vector Network Analyzer N1201SA: s.click.aliexpress.com/e/_dYy...
NanoVNA: s.click.aliexpress.com/e/_AevM5f
Different LTDZ sites: www.rudiswiki.de/wiki9/Spectr..., alloza.eu/david/WordPress3/?pa..., www.epanorama.net/blog/2019/0..., vma-satellite.blogspot.com/20...
SSA3032X Teardown: • TSP #104 - Siglent SSA...
VNA video: • #191 Optimizing Antenn...
SDR video: • #286 How does Software...
Transistor Tester video: • #290 How do Transistor...
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@L-36 4 роки тому
I designed spectrum analyzers for Hewlett Packard as my first job out of collage in 1971. The group I worked in is now called Keysight. They were very expensive but I see you can buy one now for a few hundred dollars and get a spectrum analyzer that works to 22GHz. Wow. I worked on the log amplifier that had a dynamic range of 100dB. Loved this video. I think that this cheap analyzer is mixing the input down to DC but the filter is actually a bandpass with a bandwidth of about 250 KHz and a center frequency of about 200 KHz. Thus when you input a signal you see both the + and - image products of the mixer output spaced 400 KHz apart. The display occupies that plus the bandwidth of the filter so they call it 1 MHz. When the LO is tuned to the frequency of the input signal the output is DC and the filter blocks it so you see what looks like a notch in the output.
@szabonandi 4 роки тому
This is when somebody understood the math behind the view... congrat!
@LutzSchafer 4 роки тому
Yeah that's very plausible. Thank you! That both side bands are visible seemed obvious. But how is this avoided in the design of professional instrumentation?
@L-36 4 роки тому
@@LutzSchafer It gets very complicated as there are way more things to worry about than just the issue with this cheap spectrum analyzer. But for the question asked I will give a short reply. If you want to analyze .1 to 2.5 GHz, mix the input up to 3.6 GHz. Then the LO goes from 3.7 to 6.1GHz and the difference signal is 3.6 and the sum is 3.8 to 8.6 and can easily be filtered out. Then use another mixer to get the signal down to 300 MHz and another to get to 21MHz where I built the Log amp. These frequencies need to be carefully selected so that harmonics of the LO do not put spurious signals in band so they are picked more carefully that what I did in the above example. Hope this helps.
@L-36 4 роки тому
By the way, the HP8566 weighed 100 pounds.
@AndreasSpiess 4 роки тому
I suggest to watch the Signalpath video. There you see exactly what Allen explains: ukposts.info/have/v-deo/fp5oqZd8jZuAsZ8.html
@reinholdu9909 4 роки тому
Best "organized" Vid in UKposts! Please never give up your style of "summarization". -seems yet another piece of equipment where I have to know the result before I can measure it... let me check the improvements ;)
@AndreasSpiess 4 роки тому
Should improve the dynamic range...
@reinholdu9909 4 роки тому
Andreas tnx... btw:YOU (and QO-100 :) are driving me now to finally go for a HAM licence ...keep up the good work "in style" (=your's :)
@MrPerrey 4 роки тому
@@AndreasSpiess - Yes, definitely on of the best organized tec chanel's over YT. And there are no wrong miss leading or confusing procedures. It's Swiss prescision content!!!
@k19radio13 Рік тому
Awsome work and chanel. Thank you for your dedicated work. For this present moment the great tool is tinySA Ultra.
@CyclingSteve 4 роки тому
My cat is a 1KHz detector, he came running, meowing every time you whistled. :D
@hopje01 4 роки тому
Mine too! She doesn’t like this video :)
@thebeststooge 4 роки тому
Thank you as my cat whined when he whistled and I did not know why but now do.
@AndreasSpiess 4 роки тому
Sorry for that, guys!
@CyclingSteve 4 роки тому
@@AndreasSpiess It was kinda funny, he never comes running when I whistle, I must be off tune.
@AndreasSpiess 4 роки тому
@Green Steve: My natural authority over small animals? ;-)
@thetastefultoastie6077 4 роки тому
5:48 _natural sine wave generator_ 😄
@jankomuzykant1844 4 роки тому
1570 Hz (by Android apk) ;o)
@AndreasSpiess 4 роки тому
So it was a bit over the 1k signal...
@mrdouble 3 роки тому
Freaked my dog out
@ernstelderenbosch1715 4 роки тому
Thank you for yet another very interesting video! The testing, the explanations and the conclusions at the end are all very valuable. Thank you!
@AndreasSpiess 4 роки тому
You are welcome!
@GeorgeWMays 4 роки тому
Lab cat. Very important. More valuable than the cheapie spectrum analayzer. Thank you for an informative video.
@AndreasSpiess 4 роки тому
And also more expensive ;-)
@SkyhawkSteve 4 роки тому
and sometimes cats can be used as an ESD generator.... although usually when you weren't planning on it. :-)
@andychow5509 4 роки тому
Thanks! I was looking at such a very device just the other day to analyse my antenna design. It's really cool that you showed another device @9m30s that is probably more what I was looking for. Thank you for your good quality videos.
@AndreasSpiess 4 роки тому
You are welcome!
@seb_rura 3 роки тому
You are incredibly talenful in teaching and explaining things in a way that makes it easy to understand.
@AndreasSpiess 3 роки тому
Thank you!
@larrynelson8385 4 роки тому
Excellent presentation and explanations Mr. Andreas. Keep sharing your knowledge and we will enhance our world one step at a time!
@AndreasSpiess 4 роки тому
Thank you for your nice words!
@philliptoone 4 роки тому
Perfect timing. I just ordered two BF-F8HP radios last week and started studying for my technician license. This week I learned about antennas, SWR meters, and the NanoVNA. So much new information introduced to me in such a short time I feel like I am in college again. Thanks for making this video to supplement what I am already trying to learn.
@AndreasSpiess 4 роки тому
Seems you are on the right track!
@marcos.1767 4 роки тому
Wow. I understood how a Spectrum Analyzer is working and what it's for. In some 20 minutes. Thanks!
@AndreasSpiess 4 роки тому
You are welcome!
@lohikarhu734 4 роки тому
@@AndreasSpiess BTW, Andreas (du ?), is the hat simply part of your personal style, or is it a kind of "Tracht"?
@reinholdu9909 4 роки тому
Let's wait for Andreas' answer ... (but) If you go back you'll find re. "🤠" that he is/used to be a steampunk afficionado... (zurich maker faire 2017) 73 de 🚲
@PhG1961 4 роки тому
@@lohikarhu734 It's an 'ensemble' together with the 'lederhose'. Very common in alpine countries... ;-)
@lohikarhu734 4 роки тому
@@reinholdu9909 Steampunk :-)
@winterheng2359 Рік тому
I appreciates how you do the comparison in a very in-depth details. I works as a RF engineer and always find myself lacking in many area. This information is very useful to me on how normal practices are done based on different people and their background. Thanks man!
@AndreasSpiess Рік тому
Glad it was helpful!
@tonysfun 4 роки тому
Very nice video again! You make my day, because I learn several new things and that is a must for me. Thank you Andreas!
@AndreasSpiess 4 роки тому
I try to add some value to my test videos. Like that I hope it is easier for the viewer to decide if someting is good or bad for his application.
@mwwhited Місяць тому
Thanks for the video. Very helpful… and your lab assistant napping at the end is great.
@AndreasSpiess Місяць тому
Glad it was helpful!
@AaronJackson1 4 роки тому
This was a great video. You explained everything so well. Thanks!
@AndreasSpiess 4 роки тому
You are welcome!
@manuelcornejo7405 3 роки тому
Yes, yes Andreas is a good communicator
@funtimess2995 3 роки тому
Great videos :) Love the artificial hand...lol You have a great sense of humor along with great tech knowledge... Thanks for making it so much fun to watch.
@AndreasSpiess 3 роки тому
Thank you for your nice words!
@JAKOB1977 3 роки тому
Thx for the walkthru, well done and I love how you link and make due diligence on these products and link to the relevant parts, that a possible owner can benefit from.(golden) many other channels can learn from the "viewer perspective-awareness" you seem to suit your videos with. well done Andreas. +1 Don't have this Spectrum analyzer but were looking into it as an entry tool to just get familiar with this kind of class apparatus. at around 30 bucks delivered for this unit (no shell), alternatives are not hanging on the threes in this sub 100 bucks environment.
@AndreasSpiess 3 роки тому
You are right: For sure it is good as an education device. And knowing this technology is important for many projects
@skylabby 4 роки тому
Let me say thank you for this video Andreas. I had this same device from banggood sitting on my desk and couldn't get it to work, i will be going back to it now that i have a better understanding of it..thank again.
@AndreasSpiess 4 роки тому
I hope it will work for you.
@cbc7599 3 роки тому
Tnx for nice explenation! Got it: the FIXED Resolution Band Width!
@AndreasSpiess 3 роки тому
:-)
@Aemilindore 4 роки тому
Thank you so much Andreas!! Lovely video. Thanks for your time.
@meteor8076 4 роки тому
yes, he has very cool videos
@AndreasSpiess 4 роки тому
You are welcome!
@mkatsube 3 роки тому
Thank you for wonderful explanation! I got exact image of this spectrum analyzer (LTDZ_35-4400M). I had interest in notch characteristics for CW (Continuous Wave) that 145.55MHz in your video. I checked the circuit diagram and I understood the mechanism of that. Following 2 things are the points of the notch: - The same idea of DCR (Direct Conversion Receiver) - The characteristics of RBW (Resolution Band-Width) filter About the DCR, when we apply the same frequency signal for RF (measurement signal) and LO (Local Oscillator) of the mixer (IAM81008), the mixer output become DC signal. And amplitude of the DC signal depend on the phase difference between RF and LO. However, RBW filter has DC block capacitors, so DC voltage doesn't reach to Logamp (AD8307) input pin. These DC block capacitors are the major reason of the notch characteristics. About the RBW filter, I simulated RBW filter (including DC block capacitors) that using LTspice. It had f0= 200kHz +/- 100kHz of bandpass filter characteristics. When we apply CW to the RF input, Logamp input will appear twin peaks of signal because RBW filter has bandpass characteristics. I think your demonstration of 145.55MHz CW agree to my estimation. Because I seen the frequency difference between peak to peak is 400kHz (=200kHz*2) in your video. I got additional idea from these consideration. It is TG (Tracking Generator) offset frequency. In DCR idea, if LO and TG sweep with the same frequency, mixer output will be DC voltage. In this spectrum analyzer, we cannot see frequency spectrum because DC block capacitor blocks DC voltage. So in this spectrum analyzer, TG (become RF signal) and LO frequency should have offset value such as 200kHz.
@retrociencia 2 роки тому
Amazing explanation! I was trying to figure out what was causing the notch. This design was used to simplify the mixing stage, using just one, in contrast to "conventional", or "real" spectrum analyzers that uses two or more mixing stages, right?
@terence79chan 4 роки тому
Thank you for this excellent review! I have a spare Agilent 6ghz directional coupler and plan to get this for a friend who needs to measure SWR for his home-built 3.5ghz 5G-antenna. It lacks speed and resolution as a spectrum analyzer, but I hope it works fine for plotting S11 curve.
@AndreasSpiess 4 роки тому
I like the VNA to measure S11. But a SA should also work.
@terence79chan 4 роки тому
Thanks a lot Andreas, I will give it a go :)
@MILENEO3 3 роки тому
I was about to buy one of these 50 dollars spectrum analyzer, but after seeing this video I changed my mine. Thanks Andreas Spiess
@AndreasSpiess 3 роки тому
You are welcome!
@TurkishLoserInc 4 роки тому
Thank you again for the high quality video! I was thinking about getting one of these, I'm glad to know exactly what the limitations are.
@AndreasSpiess 4 роки тому
You are welcome! This was exactly the reason for that video...
@stevec5000 4 роки тому
The limitations are not what you see in the video.
@Moonbase59 4 роки тому
Always looking forward to hearing from you! I’m not into RF much myself (except when having to filter harmonics, hee hee), but your videos are always didactically well prepared so it’s pure joy watching them and there’s always something to learn. And of course I dig cat-lovers, having had my own lab cat for ever so many years. :-) Anyways, thanks for being there, doing all this and even teaching an old fart new tricks from time to time!
@AndreasSpiess 4 роки тому
I am an old fart, too. And Dishka, too. So we are already three. She, however, seems not to be too interested in learning new tricks...
@ThomasDwyer187 4 роки тому
Excellent educational presentation, bromigo!
@AndreasSpiess 4 роки тому
Thank you!
@AjinkyaMahajan 4 роки тому
wonderful explanation on a Spectrum analyzer. Thanks ✨✌😊
@AndreasSpiess 4 роки тому
You are welcome!
@MalagasOnFire 4 роки тому
Very usefull tutorial about Spectrum Analyzer .. the natural sinewave generator is a must and cat is paying atention even "sleeping".
@AndreasSpiess 4 роки тому
Yes, she usually does not sleep. She just "rests"...
@zennsystems9433 Рік тому
Excellent explanations. Thank you
@AndreasSpiess Рік тому
You are welcome!
@hernanirodrigues5261 4 роки тому
Very good job Andreas, nice presentation and very useful, tanks you...!
@AndreasSpiess 4 роки тому
Glad you enjoyed it!
@giololucas 4 роки тому
Thank you for quality information. I'm using sdr + white noise Zener + spektrum software to align homemade vhf filters. Regarding my application my setup performs similar to NWT. At the end nothing can replace a good sigilent anritsu Hp spectrum analizer. Thanks again !!!
@AndreasSpiess 4 роки тому
The new cheap VNAs are a handy replacement for antenna design in my opinion. And affordable for most.
@iwan6841 3 роки тому
I love the little 🖐, pointing out things 😂
@AndreasSpiess 3 роки тому
:-)
@manuelcornejo7405 3 роки тому
Me too. Where did you buy it?
@soumitradey8208 4 роки тому
Great Sir! I guess it will be a good instrument to design antenna
@AndreasSpiess 4 роки тому
As I mentioned. For antenna tuning, a VNA is a much better tool
@souta95 4 роки тому
Thanks for the video! I found it really informative. I probably would have wanted one of these had I seen them for sale, but as I mostly would use it to measure harmonics from transceivers they are kinda useless. I think for cheap harmonics measurements an SDR dongle and attenuator is the way to go. I already have a Nano VNA for checking filters and antennas.
@AndreasSpiess 4 роки тому
You are right.
@pulesjet 4 роки тому
Before Spectrum Analyzers we had Frequency Selective Voltage meters. Aka the most expensive AM Radio's in the world. Cool Video yet again Sir.
@AndreasSpiess 4 роки тому
This was probably many years ago... But they did the job. And many awesome projects were done in this time.
@TheHellfiremissile 4 роки тому
Thanks for the video Andreas. My radio club bought a Rigol Spectrum analyser a few months ago and I wanted something similar for my little work bench and having found this on ebay thought it was a good little project ( I bought the naked board). I've only yesterday finished putting it into a case with N connectors and will be keen to try the new software. Love the cat on keyboard :-) Keep up the vid's, It's good to see a ham doing such a diverse range of topics.
@AndreasSpiess 4 роки тому
For HAMs a nanoVNA maybe is a better choice to measure antennas and filters. I hope your SA will do the job.
@iggy2k 4 роки тому
I love that tiny helping hand
@AndreasSpiess 4 роки тому
:-)
@SteveWrightNZ 4 роки тому
Thanks Andreas
@AndreasSpiess 4 роки тому
You are welcome!
@springwoodcottage4248 4 роки тому
Super interesting & my dog jumped from her bed & started barking at your whistle, so we both got something from your video. Thanks for sharing!
@AndreasSpiess 4 роки тому
:-)) You are welcome!
@magnetiseur77 4 роки тому
I made a receiver with tracking ADF synth and nextion display some years ago. To have a flat power signal, I had to add an amplifier and a step attenuator (controlled by µC). It has to be calibrated ! Now I have +/- 1dB precision. (compared to my keysight at work)
@AndreasSpiess 4 роки тому
Sounds like a nice project! All possible with today's cheap ICs. And a good instrument for calibration ;-)
@peterlaidlaw8655 4 роки тому
Thanks for doing this - useful!
@AndreasSpiess 4 роки тому
You are welcome!
@qzorn4440 Рік тому
wow this is so cool. I am starting to check out how to build a SDR radio telescope and one video used a cheap spectrum analyzer test the 21cm astronomy hydrogen line. This is a all new learning curve on making a homemade radio telescope using SDR software. 😎 thanks a lot.
@AndreasSpiess Рік тому
Check the newest link in the description before you buy a TinySA. There is a new version available.
@qzorn4440 Рік тому
@@AndreasSpiess I checked it out and ordered a: tinySA ULTRA 100k-5.3GHz Hand held tiny Spectrum Analyzer + 4" TFT LCD +Battery. Thank you very much.
@antondahr6792 6 місяців тому
Fantastic video! Thank you!
@AndreasSpiess 6 місяців тому
Glad you liked it!
@olivierlourme9521 4 роки тому
Probably my favorite video among all your great quality tutorials! But what does the VBW indication on your Siglent screen correspond to?
@AndreasSpiess 4 роки тому
The explanation is here: www.siglenteu.com/application-note/spectrum-analyzer-basics-bandwidth/
@mbak7801 3 роки тому
In my small lab I have an anti static workstation. Earthing, wrist strap points etc. Grounding for me, my equipment and soldering station. The sight of the purring cat is cute. Except all I could think of was "THE STATIC!".
@AndreasSpiess 3 роки тому
She is for sure not helpful to prevent static charges, you are right!
@riesmoos 4 роки тому
Good video. I had a look at this cheap device a few weeks back, my mouse cursor hovered over the 'buy now' button. After watching this review i decided NOT to buy it, save up more money for a proper one. This video saved me $55 and disapointement. Thank you Andreas !!
@AndreasSpiess 4 роки тому
You are welcome. Decisions like that are the purpose of this video...
@epiendless1128 3 роки тому
Thanks. Useful pointers here of what to look for in a cheap analyser. As I like to say, I would RTFM, but there was no FM to R.
@AndreasSpiess 3 роки тому
Documentation and software is not a strength of Chinese manufacturers, you are right.
@deniscloud2474 3 роки тому
YOU ARE AMAZING ! thanks for good content
@AndreasSpiess 3 роки тому
You are welcome!
@mszivatz 3 роки тому
Thanks for the great video! After this video I bought this analyzer! I am a developer for electronic devices and I think this device helps me. Lg Szivatz.at from Austria
@AndreasSpiess 3 роки тому
Glad you like it!
@Turboy65 2 роки тому
I used my R&S FSEA20 analyzers almost every day for a seven year period. I got pretty used to these high performance machines that had a noise floor of about -160 dBM at zero span. Made my job easy. These days those analyzers can be had for about 1500 bucks in good working order.
@AndreasSpiess 2 роки тому
You are right. I see a lot of people buying these old instruments. They are a very good choice if you have enough space and maybe also some knowledge to use/repair them. For you, as a long-time user, this is a perfect fit and not comparable with such a cheap device...
@minazulkhan8287 11 місяців тому
I like the way you reply to each comment. Keep going
@AndreasSpiess 11 місяців тому
Thank you!
@tusharg21tube 3 роки тому
Wonderful video! Useful & neat!
@AndreasSpiess 3 роки тому
Thank you!
@DarrellBoger 3 роки тому
I LOVE the pointer.
@AndreasSpiess 3 роки тому
:-)
@DocMicha 4 роки тому
Thank you, That was one of my questions I posted some videos ago!
@AndreasSpiess 4 роки тому
:-)
@bloguetronica 4 роки тому
The solution of removing the display and just add an USB control makes instruments cheaper and, more importantly, smaller. I've made several USB instruments under the same principle. Actually, the video caught my attention because of this. Anyway, loved the video and also subscribed. Thanks for sharing!
@AndreasSpiess 4 роки тому
Welcome aboard the channel!
@goofypettiger 3 роки тому
Great video, dude. Love the cat.
@AndreasSpiess 3 роки тому
Glad you enjoyed it
@LawpickingLocksmith 4 роки тому
Awesome, thanks Andreas!
@AndreasSpiess 4 роки тому
You are welcome!
@sq2jul 4 роки тому
Thank you for another great video. I wish to see more episodes related to RF signals and ham radio. Vy 73!
@AndreasSpiess 4 роки тому
This is not ham channel. It focusses on the ISM usage of RF because only a very few of my viewers are HAMs. Maybe I can motivate a few ISM guys go get licensed...
@robertsmiczsmiczamplificat593 4 роки тому
Very good info..I subscribed and plan to watch more vids. I have added some external filters and a 30db wide band LNA on the input of mine. It has made the spectrum analyzer more useable. It’s still not great, but much better. I also did clean up the Power supply and did the mods going around on the net. I added a variable attenuator on the in and TG out along with the ext Amps. I packed it a nice shielded cabinet its not as good as a real network analyzer, but it is actually useful now. I actually made a selectable multi filter selection for different band widths. The stock internal filtering was pretty bad. I may try to do some more improvements? We will see? Too many pokers in the fire. Great channel. I enjoyed watching.
@AndreasSpiess 4 роки тому
Welcome aboard the channel! You invested quite some effort¨. Maybe you document it for others to follow?
@robertsmiczsmiczamplificat593 4 роки тому
Andreas Spiess . Thank you sir. I will try to put together all my info on the mods i made. Its pretty much chicken scratch now, but i will try to compile it i to something intelligible. I will be watching and i will let the channel know when i have good information to share. Thank you for the warm welcome.
@VK3CSJ Рік тому
Thanks Andreas a good informative video. I just purchased a unit off AliExpress not the same one you have here but its labled 35-4400MHz with a IN and OUT port and USB port. I hope it will work well for monitoring a wideband Digital DVB-S2/T ATV transmission at 1255 MHz...love your puscat I have a long hair pus too...Cheers Clint - VK3CSJ...
@AndreasSpiess Рік тому
Usually these devices are not used as receivers. They are more used to measure emissions... 73 de Andreas, HB9BLA
@marsa74 4 роки тому
Excellent video, as usual, thanks very much, Andreas. That German "Tiefpaßfilter" should be at least 24 years old as it is written "Tiefpassfilter" since 1996. Now I know what a spelling reform is good for.
@AndreasSpiess 4 роки тому
Interesting. Frequencies still are the same today...
@bulldogbrower6732 4 роки тому
I hope that they continue to improve the device.
@AndreasSpiess 4 роки тому
Let's hope...
@PhG1961 4 роки тому
I defenately liked this one ! Excellent and well described !
@AndreasSpiess 4 роки тому
Thank you!
@IanWilkinson-SgtWilko 4 роки тому
Excellent video as always! Two quick things... The link to the VNA video in the description is pointing to Amazon, not UKposts. Did you do a video comparing the nanoVNA to the other VNA? I thought you had, but I can't find it.
@AndreasSpiess 4 роки тому
I changed the link now. Thanks. And I did not do a comparison of the nanoVNA. There are quite a few videos out already and I still think, the N1201SA is the better deal for ISM band guys. I wait for the successor which will also cover more than 900 MHz with a decent resolution.
@HappyQuailsLC 4 роки тому
I also would have enjoyed seeing the cat's purring on an audio spectrum analyzer's display output!
@AndreasSpiess 4 роки тому
Maybe stuff for another video...
@robingilham 3 роки тому
Very Interesting and useful. I was wondering if it would be possible to use one of these to perform Prequalification EMC / EMI RF tests in a DIY TEK cell. Or perhaps there might be some other way to get an idea before spending $$
@AndreasSpiess 3 роки тому
They are not very sensitive. And for sure not precise. If your application can live with that you are good to go.. I doubt it.
@meteor8076 4 роки тому
Cat found the best spot for a snap :D
@AndreasSpiess 4 роки тому
This is why I need three monitors. One is no more usable...
@phiber9 4 роки тому
Thank you Guy with a swiss accent. I visited Luzerne for 1 day. At night. It was okay. :) I want a spectrum analyzer. I don't have a use for it right off the top of my head but I would find a reason. Not swiss mentality but hey... this is internet.
@AndreasSpiess 4 роки тому
I also have bought a few things like that ;-)
@Lion_McLionhead 4 роки тому
Relearned the term "tracking generator" from school, but these days you might as well get an SDR in that price range.
@AndreasSpiess 4 роки тому
As I mentioned, the SDRs are not exactly the same. If you want one with transmit you are in a higher proce range.
@acestudioscouk-Ace-G0ACE Рік тому
Another very useful video thank-you. 2 years on I was hoping perhaps you had covered the Tiny SA spectrum analyser but could not find it on your page. I would be very interested to know how you find it.
@AndreasSpiess Рік тому
It seems to be a good device. There are a few very instructional videos on UKposts. I think they are from the programmer of the firmware.
@acestudioscouk-Ace-G0ACE Рік тому
@@AndreasSpiess Thanks for the reply. I have seen some videos. I was interested in how you personally found them. I think they are worth a try at the price.
@AndreasSpiess Рік тому
@@acestudioscouk-Ace-G0ACE I have a Siglent Spectrum Analyzer on my desk. So I did not use the tinySSA a lot.
@meteor8076 4 роки тому
very interesting !
@AndreasSpiess 4 роки тому
:-)
@cmuller1441 4 роки тому
You could say that the Mixer is a Multiplier. If you remember your trigonometry: sin(a)* sin(b) = (cos(a − b) − cos(a + b))/2 This is why the sum and difference of frequencies appear. In practice the Mixer is not perfect and there are nonlinearities that generates also harmonics so you get N*a + M*b (with N and M integers). But the other frequencies and usually much attenuated with a good Mixer.
@cmuller1441 4 роки тому
And if you want to know how to multiply signals: ukposts.info/have/v-deo/b56eoZhnp6eFtmQ.html
@AndreasSpiess 4 роки тому
You are, of course, right. For my videos I usually need more time to "leave things out" than to "put things in"...
@cmuller1441 4 роки тому
@@AndreasSpiess I understand that just putting a trigonometry formula in a video can scare people 😆 I'm not a RF guy at all but I find that part of electronics quite stimulating. I just wanted to add some extra for the curious ones that asked themselves "how does a mixer work?"...
@AndreasSpiess 4 роки тому
BTW: Your link points to a very good channel...
@umutk5614 4 роки тому
Thanks Andreas, I learned at least basics by your nice video. By the way I loved your cat :-D
@AndreasSpiess 4 роки тому
Thank you! And I will tell her...
@umutk5614 4 роки тому
@@AndreasSpiess Purrfekt 😃
@anthonycardenas9177 2 роки тому
Andreas, thank you for your outstanding work! Please, will you PLEASE update your Links at the bottom? Sadly a number of them no longer connect. Thank you again!
@AndreasSpiess 2 роки тому
With 400 videos I cannot update all links :-( But I updated the link to the TinySA
@geirthorud6581 4 роки тому
You saved me $50. I might have bought this for fun. Also from the comments I learned that the Germans have abandoned the old version of "ss" which I learned back in the 1970-s. The "sharp s" which it was called here. (Where is it on my keybord?)
@AndreasSpiess 4 роки тому
AFAIK it is still on their keaboard. We Swiss never needed it ;-)
@mohalothman99 4 роки тому
Great channel and great content! But every time I see this hand pointer I feel terrible may it is kind of phobia I don't know what this feeling!
@AndreasSpiess 4 роки тому
Maybe you ask your doctor? It is harmless ;-)
@mohalothman99 4 роки тому
@@AndreasSpiess may could I ask you to do not use this hand pointer please? Only for next video I will really appreciate it. Thanks 😊
@bourasabdennour8369 4 роки тому
Please a video about using SDR as Spectrum analyser :)
@AndreasSpiess 4 роки тому
Maybe later...
@manuelcornejo7405 3 роки тому
@@AndreasSpiess Yes please
@combin8or 4 роки тому
Please do a video on SDRs and clever configurable (elegant design and possibly cheap using HEMTs/GaN) front ends. I was hoping for a bit more of a deep dive into that sort of thing when I was notified of this video.
@AndreasSpiess 4 роки тому
For 50$? GaN? Maybe in a few years...
@combin8or 4 роки тому
@@AndreasSpiess $50? I'm confused as to the number you came up with as well as the significance-- I just would like to see an exploration of HEMTs before they're commonplace. Also, GaN transistors aren't very expensive now and they are underrepresented in enthusiasts' communities, so I thought you'd have an opportunity to deep dive where no man had before. It's ripe for clever approaches.
@combin8or 4 роки тому
@@AndreasSpiess GaN transistors are cheap and extremely capable (maybe you were thinking of SiC?)-- for instance: www.digikey.com/products/en?WT.z_cid=sp_917_buynow&keywords=917-1153-1-ND
@AndreasSpiess 4 роки тому
I thought your comment was about a device using this new technology ;-) I am no specialist in this and I also think it would be too special for this channel. Maybe others will cover it.
@LutzSchafer 4 роки тому
Andreas I have done similar experiments with the same Banggood device. What struck me first was that the tracking generator produces more or less a square waveform. Presumably same is true for the LO since it uses the same chip. So the mixing products must contain odd harmonics of the LO. I also observed the dip when trying to display a single carrier tone. You have any idea what it's causing it? It almost looks like as if both side frequencies contribute to whatever is "measured". The symmetry kindof gives it away. BTW I like your cat :)
@AndreasSpiess 4 роки тому
Viewer Allen Edwards below gives an explanation for the notch. Concerning square wave: You are right. But because the LO sweeps with the TG it (usually) does not see these harmonics. I mentioned that the Siglent has more filters. This is where some of them are. Its TG creates a sine...
@noweare1 4 роки тому
Even though I' have a degree in EE I have never worked in rf or high frequency areas. I find these videos interesting but intimidating.
@AndreasSpiess 4 роки тому
RF is not the simplest topic ;-)
@pentachronic 3 роки тому
I think there's a reason a lot of RF Engineers are older. Because it takes quite a long time to learn RF !! 😉
@BorisDessimond 4 роки тому
As usual, very useful video, that will once again hit my student's bank account, that will take me hours to play with that took I don't really need 😭 ❤️.
@AndreasSpiess 4 роки тому
If you learn something, it is probably worth the money ;-) Mixers and signal generators are also quite cheap. So you have everything for experimentation...
@BorisDessimond 4 роки тому
@@AndreasSpiess 100% agree. That's why I have a salary worth of electronics stacked in boxes in the medicine laboratory I'm doing my PhD in. Waiting for Prusa mini to put those fire hazard in more fancy boxes.
@aballos1 4 роки тому
Very nice and explorative video. Did you try the snasharp software???
@AndreasSpiess 4 роки тому
I did not know it. But now I tried. Unfortunately I also was not successful. I tried to calibrate the SA and then measure the very same configuration. I would have expected to see 0 dBm across the spectrum. Unfortunately II did not see anything like that. :-(
@yangYang-df2zy 4 роки тому
I like that sweet hand! That helps a lot!!!!!!!!
@AndreasSpiess 4 роки тому
:-)
@drouais1008 3 роки тому
Hello Andrea, all, First, thank you for this demonstration. Just wondering how you would use the cheap spectrum analyzer to measure noise from magnetron @2.999997GHz in a room? I was aiming to use a dipole antenna on the input but shall I need filtering ? which sweep span do you suggest? any other advise? Thank you and wish you the best for 2021.
@AndreasSpiess 3 роки тому
I do not know. Never used magnetrons.
@drouais1008 3 роки тому
@@AndreasSpiess ;-) microwave oven for instance !
@tartanpion8643 2 роки тому
thanks
@AndreasSpiess 2 роки тому
Welcome!
@ghlscitel6714 4 роки тому
Grüezi! I enjoyed the video from beginning to end. I still use my Tektronix 2711 and I will not buy the one from Banggood.
@AndreasSpiess 4 роки тому
Probably not a bad decision ;-)
@jms019 3 роки тому
The cat was really impressed
@AndreasSpiess 3 роки тому
:-))
@ovalwingnut 4 роки тому
I ❤ the Mini Me FINGER. Just saying. Good show (you can take my word for it) 🇺🇸
@AndreasSpiess 4 роки тому
Thank you!
@AndreasDelleske 3 роки тому
Dear Andreas, thanks (again!) for your videos! Now if I only had to find out radio interferences disturbing (V)DSL lines and modems (I guess up to 10 MHz), what would you suggest? A cheap SDR might be enough, right? What kind of antenna? Bonus would be if I could scan up to 1 GHz to include LoRa and / or up to about 5 GHz to include Wifi - to cover the last two steps would be much more expensive, am I right?
@AndreasSpiess 3 роки тому
It depends if your RFI is conducted or not. And SDR is usually good. But the cheap ones not always cover below 10MHz. If it is conducted (via cable) you can use this video: ukposts.info/have/v-deo/oZljg5h_oKVqo4E.html (in German)
@AndreasDelleske 3 роки тому
@@AndreasSpiess Ah great information, many thanks! Just for fun I ordered a SDR dongle and will check if I see something similar as the DSL spectrum (I'll not connect directly I have no attenuator). The antenna design really appeals to me :)
@AndreasSpiess 3 роки тому
An SDR dongle anyway belongs in all labs ;-)
@danimationstips 3 роки тому
Thanks Andreas. I'm interested in testing an area to find out what radio frequencies and signal strengths are present. What would be the most cost-effective way to approach this problem?
@AndreasSpiess 3 роки тому
A spectrum analyzer is good. Or an SDR radio.
@danimationstips 3 роки тому
@@AndreasSpiess How much would you need to spend on either of these technologies in order to get something reliable and useful? Do you have any brands/models to recommend?
@goofypettiger 3 роки тому
Hello, very good video. I just got this same device in the mail. I was disappointed to see that when looking at FM broadcast, the 200khz signal is split into two ghost images, with a notch at the center. Is there a way to change the resolution bandwidth?
@AndreasSpiess 3 роки тому
I mentioned it in the video: No, you cannot change the RBW without soldering
@ddjazz 4 роки тому
TLDR It works but you get what you paid for. Thorough video again by Andreas!
@AndreasSpiess 4 роки тому
I still think, we get quite a lot for 50 dollars. Those new AD chips really make it easy to build interesting things...
@DrTune 4 роки тому
Thanks! I was considering buying one but my LimeSDR is much better, I'll stick with that
@AndreasSpiess 4 роки тому
You a re for sure not bad witrh a LimeSDR ;-)
@McTroyd 4 роки тому
Amazing how cheap things can be when the core functionality can be implemented in software.
@AndreasSpiess 4 роки тому
And excellent chips can be bought from Analog Devices for nothing...
@slimygreen1967 2 роки тому
Natural signal generator =whistle... love it
@AndreasSpiess 2 роки тому
Simple and cheap ;-)
@slimygreen1967 2 роки тому
@@AndreasSpiess i love your videos. Thank you so much for producing these. You are an absolute legend. Im looking to build a tinygs soon when my parts arrive. You have inspired me to look into other lora systems as well. Keep up the great work.
@dave_dennis 2 роки тому
I recently purchased a miniSA spectrum analyzer. I am Sure you’ve seen it. It is not all that different than the miniVNA. I would love to see you analysis of it and show too it’s usefulness and it’s weaknesses.
@AndreasSpiess 2 роки тому
You find a few very good videos on UKposts. It seems to be much better than the one here...
@electronic7979 4 роки тому
Nice item
@isidoromaich7226 4 роки тому
🙂
@AndreasSpiess 4 роки тому
Yes!
@MickeyD2012 4 роки тому
That whistling bounced off my walls and really creeped me out.
@VViproz 4 роки тому
Would be nice to see you show this with an SDR, it eliminates some of the issues shown here (probably adds new different issues). You can use Spektrum made by Pavels on GitHub, I've helped on the development so if you have any question you can shoot me an email !
@AndreasSpiess 4 роки тому
Spectrum analyzers do not measure phase as tthe VNAs do. So they are slightly different. I prefer VNAs for Antenna work.
@lohikarhu734 4 роки тому
I think that the 'notch' is not RBW-related issue, but due to the LO 'step', since it appears that the design does not actually 'sweep', but uses discrete step sizes, or?
@listerdave1240 4 роки тому
It's because when the frequency of the LO is exactly the same as the input frequency the output of the mixer is DC and the logarithmic amplifier does not amplify DC or very low frequency, also because of capacitor C29 which blocks any DC into the amplifier anyway. As the LO moves slightly above or below the input frequency then the frequency of the output from the mixer is again high enough to pass through C29 and for the AD8307 to amplify it. Apart from the notch this design has another flaw, that of 'reflections'. If for instance you were to look at an SSB signal it would appear as a double sideband one with suppressed carrier. In 'real' spectrum analysers they do not convert to DC but instead to an intermediate frequency of a few MHz and then measure the amplitude of that. That also eliminates the reflection problem.
@user-jp7tw3sd3x 4 роки тому
@@listerdave1240 Thank you for explaining this phenomenon. This "notch" didn't make much sense given the theoretical principle of operation. BTW, isn't C18 also a problem?
@NiHaoMike64 4 роки тому
@@listerdave1240 The AD8307 can handle up to 500MHz. An IF around 450MHz would stay well within the specs of the 8307 and make it easier to design the image rejection filter.
@LutzSchafer 4 роки тому
@@listerdave1240 This makes alot of sense. Why couldn't they just down convert to a constant IF like in any good old superheterodyne receiver? Then using a narrow band amp with filters would also filter out the odd integer multiples due to the square waveform of the LO. Yeah I realize this 50 bucks spend wasn't worth it's bang ...
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