#251
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- เผยแพร่เมื่อ 12 ก.พ. 2017
- While recovering from my broken ankle, I can't really get into my lab - so my next few videos are likely to be like this one - computer screen cap... Today's video is geared more towards the professional customers that I support rather than the hobbyist, and shows how to use a Tektronix RSA306B and SignalVu-PC to view, capture and analyze some narrowband frequency hopping signals. I use Bluetooth signals as an example, using a technique that I call "Capture Wide, Analyze Narrow". This capability is inherent to all Tek USB RSAs (RSA306B, RSA503A, RSA507A, RSA603A, RSA607A) as well as all of the benchtop real-time spectrum analyzers (RSA5100, RSA6100 and RSA7100 series).
- วิทยาศาสตร์และเทคโนโลยี
Thanks, Alan! Hope your recovery is going nicely. It's amazing what can be done with a real time spectrum analyzer.
Very interesting Alan. Nice to see you back.
This was very interesting! Keep dropping this pearls. Love them.
That WAS very interesting. I need more Tektronix scopes. Good to see you back in the lab Alan.
The Radio Shop I need a tek scope, my protek is triying to drive me NUTS!!!! Looks like the DAMN thing is looking for a 3rd storey "drop"
Even though I probably won't ever do something like this (never say never) I enjoy seeing the capabilities of higher end equipment. Thanks for taking the time to do these videos. 73 NE5U Mike
Another great video! I always learn a lot, thanks!
It took me a LOT of trial and error to figure out this workflow a few years ago - I wish I had found this video when it was first published! Thanks for the walkthrough. I still haven't used Spectrogram very much (or understood how it's different from DPXogram), but seeing your time overview setting change the way it looks helps give me a better idea! I will definitely be playing around with that display soon. Now I just wish I could right click and save the entire Spectrogram (not just the visible portion) as a PNG.
I'm glad you found this helpful. Yes, that's been a requested enhancement (saving all spectrogram traces in a file). If you save a DPXogram into a TIQ, it will save all of the traces. Feel free to reach out to your local Tek folks to help you with getting the most out of your RSA. BTW - it was a pleasure having you in the Innovation Forum.
Thank you sir for the great videos.
Would you please make a video where you capture a TDMA signal and show the timeslots in time domain and how the signal looks like on the frequency spectrum (compared to a normal broadcast signal for example).
Get well soon!
Thank you much this video, Alan! Do more same videos of SignalVu-PC, and, if it will possible, more examples how do measurements and find problems in RF world.
I'll probably do some more on SignalVu-PC, and how to accomplish different tasks.
Very interesting!
Great video as always...
Thanks Fredrick
very nice video, thanks
Enjoyed that Alan, thanks, boy TEK do make some great gear. clever tools
My humble Siglent 1102CML pails a bit compared to anything TEK have. As Dino says:- One lottery win, that's all. lol
If only one of my lottery tickets would pay off! ;-) 73 - Dino KL0S
Yep, a biiiiiiiig ticket!
Alan's back!
Even though I can't make it to my bench, I can do a few PC based videos in the meantime...
+w2aew Very interesting and informative video, please do more of these, because I'm saving money to buy RSA306B for my home lab to do some experiments.
Did you buy it?
@@saintfather7757 In the company where I work we bought RSA500 series so eventually I did not bought personal unit.
What are your 3 best RSA choices for cost vs. performance?
The RSA306 is definitely the most bang for the buck. The RSA500 and 600 series offer optional higher frequency range and optional tracking generator, and have better SFDR specs than the 306, but can cost twice as much depending on model and options.
Can you do a comparison of the RSA306B compared to the RSA306 that The Signal Path reviewed a couple years ago? I'm curious to see if this model eliminates some of the spurs present in the earlier incarnation. Oh, and feel better! --Vince
I don't have an original 306 to compare to, but here's a short 1-page doc that outlines the differences:
www.qsl.net/w/w2aew//youtube/RSA306B%20Improvements%20vs%20RSA306.pdf
Awesome. Thank you.
Need to dust off my 306 and try this. Haven't tried it on Bluetooth.
Can SignalVu be used to demodulate the FSK section in the analysis window? Or do you have to do it the old fashion way with pen and paper (or export it and use some other software)? Thanks for the videos!
Yes, you can demodulate FSK in SignalVu-PC. I requires option SMV in order to do so.
Wow, that's pretty neat! What a powerful tool!
That's just the tip of the iceberg with SignalVu-PC. See the datasheet for more:
download.tek.com/datasheet/SignalVu-PC-Vector-Signal-Analysis-Software-Datasheet-37W2797313.pdf
is that it? 5 periods for preamble and then just raw fsk? that's easy!
Great video as always. Possibly a silly question. Do either the RSA306 or the RSA500 allow you to view a larger span than 40MHz in "non real time". Also is the signal processing for the FFTs/demod done on the instrument itself, or purely on the PC?
Yes, of course. You can set the Span to anything you want up to the full frequency range. This can be done using the non-real-time Spectrum display which basically is a standard spectrum analyzer type display. You can also do this with the DPX real-time display - in this case it will step in ~40MHz "chunks", building a mini color bitmap for each chunk, stitching across the entire wideband span. All of the FFT, chirp-Z and demodulation is done in the PC on these USB based units.
w2aew Thanks for getting back to me so quickly. It's the annual underspend at work so time to go shopping!
The RSA500 series is also portable, and even better RF performance. RSA600 series for bench operation.
Two models available for each - 3GHz or 7.5GHz. Both with available tracking generator.
radioman . I have no association with Tek but anecdotally if you need real time signal analysis, and aren't quite as fussed about top of line RF performance, these USB style units are massively cheaper than benchtop ones like the R&S FSVR or FSW. I agree that the prices are a bit steep for hobbyist use, but for a company if you can get away with a single high end benchtop unit and few of these it could represent a big saving.
The level of RF performance of the RSA507A and RSA607A is in the same league as competitive analyzers that cost 2-3x as much. While they do represent a great level of performance for the money, they typically are not geared towards the hobbyist.
You seem to have a lot tektronix equipments :D
It's no secret - I work for Tektronix as a Field Applications Engineer.
I didn't know that. Thanks for letting me know.
Interesting. Thanks. What is the retail price of that? And how is the ankle?
The RSA308B retail is $3890. Ankle is healing, albeit s-l-o-w-l-y...
@2:12 I was checking my Emails ^^
May I ask for a favor? My master's thesis was using software defined radio to capture, demodulate and decode RBDS signals. I want to take a stab at doing that for a bluetooth signal, but I can't find any examples and i don't have any gear that is fast enough to capture my own. Would it be too much to ask for you to capture just *one* of those bursts we see at 3:00 and maybe upload it somewhere? I want to see how the signal is structured not just from a theoretical standpoint (ie what the standard dictates) but how the signal actually looks like, in reality and if i can somehow manage to decode it myself. Thank you in advance and i understand if you decline.
I'll look into it - not sure what format you'd need to see.
don't need more than a series of 8bit samples. Signed or unsigned is the same to me, i'll figure which one it is. Could also be CSV or something, but that might be unnecessarily big.
Here is one burst, saved as a .mat file, with a complex IQ vector for the RF signal.
danahertm.box.com/s/3fhzwtvnn83xyacb7alf03nzi7lb8syq
w2aew thank you very much :)
Almost looks like you're picking a lock.
If only the 306 went down to 1hz 😔
Bad audio quality