Вставка
- Опубліковано 23 сер 2024
- Episode 1327
a quick look at the design
TinySA (original) schematic: • #547b TinySA Reversed ...
The IF in the ULTRA is about 977 MHz, the receiver chip down converts this. In ULTRA mode the Lo is used to mix the 6 GHz signals to get a 977 MHz harmonic.
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Thanks for the overview. I’ve had a TinySA for about a year and it is quite handy for qualitative work. My Ultra version should be here in a few days. The Ultra’s DANL beats my Agilent bench SA, and it looks like some of the original TinySA shortcomings have been addressed. The differences are: the bench SA can have RBW of as low as 1 Hz, an FFT IF mode which lets you see the spectrum of transient signals that would be missed by a swept IF, and several different types of detectors. At about $120 the TinySA Ultra appears to be a pretty sweet deal.
Hi, this is very interesting, I've never had a spectrum analyzer and everything you say is new to me, I don't do Vf, when anything oscillates above 100k I get a rash 😁 However, it is very interesting and at least I learn something new, thanks for these videos.
Nice day 🙂 Tom
Many thanks for your insights! I am always a bit hesitant with that little wonder boxes. But with the help of your videos, I can make an educated decision. And I think, I put one of these on my buying list soon.
Yet another good edifying video, thank you so much!!
Great!
@IMSAI guy....
I stumbled upon your channel while researching synthesizer stuff. Holy cow man! I have watched a few of your videos this morning....awesome stuff. the one on TTL chip numbering brought back memories and the screenshot I captured will be very useful for me because I build all of my projects out of used circuit boards....
the only issue I have is that your channel's content is SO huge, yet there is no way to find anything.
I realize it would take some time, but it would be really nice to be able to reference content by playlist...
well anyways, I am subscribed and I'm sure I will be spending much time on your channel in the future.
Awesome content!!
I do have playlists
I apologize....
at a quick glance I thought they were all arranged by video # in chronological order...
I just went back and found the synthesizer stuff in the "audio" playlist.....
@@phonybobsmail1680 hope you find videos you can enjoy
One of those other paths must be the LNA.
It would have been nice if the generator could be used as a tracking generator while in spectrum analyzer mode but I don't know if the architecture permits it.
you can do this; ua-cam.com/video/wKPkvuWWFXY/v-deo.html
the IF is around 977 MHz
Thanks for reverse engineering the device. You are right the ultra mode path bypasses the low pass filter. I'm still surprised at the amount of power coming out of the mixer port in ultra mode, though. Specs say 35dB isolation and it's even more interesting if -10dBm is coming out of the attenuator(?) or straight thru. Minicircuits provides no data on that mixer above 2.5GHz so there's a good chance it's not great up there.
Can you show us how to use an HP or AIL Noise Source in place of a tracking generator for BP filter alignment...??? I think lot of folks might find that very handy to know how to do it...!
I've done several videos. search my channel for noise source.
ua-cam.com/video/IgnnMJyN9l4/v-deo.html
ua-cam.com/video/e7xCVEBs1CM/v-deo.html
ua-cam.com/video/evJcZdRJKT0/v-deo.html
On the back of the TinySa’s and in the wiki, it’s it says Designed by Erik Kaashoek. I follow various links to his GitHub repository where he has close to 80 different TinySa and NanoVna related repositories. One of those repositories is making a Spectrum Analyzer with an Arduino. I was curious if you’d tried that project and if so is it worthwhile. I tried looking through your library but I think you are at the level of needing your own dedicated search engine. Every time I search for one topic , I find 10 other videos I want to watch so I never complete my search. Thanks for all the great content and for all the time and effort you put into each video. - Jason Burchell
The spectrum analyzer I would be interested in building is this one: ua-cam.com/video/579SYLxORyw/v-deo.html
Hello! Could you show how it displays a two-tone ssb signal at different resolutions? Is it possible to use it when measuring imd3 power amplifiers?
Since the NanoVna project (and possibly the TinySa) are open source hardware and software, have you considered addressing some of the design issues you’ve pointed out in your videos in the actual schematics and PCB design files. Then branch off from the open source and send it to a place like Pcbway or the like to be manufactured? The cost appears to be minimal with the real investment being the time.
Yes considered. It is 95% software and so I'm not the right guy. Hardware wise, I would end up designing the same thing as the LibreVNA. and it would be about $500. For $1000 you get a perfectly good SA with tracking generator from Siglent. The problem with the TinySA is the mobile phone receiver chip limitations. So for pocket use, school use, hobby use, the new Tiny Ultra is just fine. The TinySA is not open source BTW
Is the LO swept in frequency so that the output varies vs the input signal?
yes
Does it have any LNA?
yes, I'm not sure where it is in the block diagram. I didn't spend a lot of time on it.