TSP

  Рет қаралды 27,506

The Signal Path

The Signal Path

Күн бұрын

In this episode Shahriar reviews the Tektronix RSA607A real-time spectrum analyzer which operates from 9kHz to 7.5GHz. The instrument has a 40MHz wide analysis window with a DANL of -160dBm. The built-in tracking generator is capable of measuring return loss, cable loss and DTF measurements without a need for an external coupler. This review is organized as follows:
01:03 - Model comparison and overview.
03:25 - Front & rear panel overview.
05:31 - Complete unit teardown & examination.
16:33 - Reverse engineering and experiments with a drone remote control transmitter.
39:27 - Characterizing and experimenting with an ISM band diplexer.
47:29 - Return loss measurements of a tunable band-pass filter.
53:23 - Concluding remarks.
The Signal Path
www.TheSignalPath.com
/ thesignalpath
www.Patreon.com/TheSignalPath

Пікірлер: 49
@Thesignalpath
@Thesignalpath 7 жыл бұрын
*The audio level is a little low for this video. I will fix this in the next episodes.*
7 жыл бұрын
I would personally call it a minor issue. Of course, it would be great to hear you better, but eventually... essence and meaningful content is something we (or at least me) look for and thankfully find on Your channel :-)
@BertVermeulen
@BertVermeulen 7 жыл бұрын
There's probably an interesting video in comparing this new mic's audio out with whatever you were using before. It sounds terrible, but I can't quite explain why :-)
@daveblane6442
@daveblane6442 7 жыл бұрын
I have a volume control. no issues.
@ldlm91
@ldlm91 7 жыл бұрын
Maybe it would be enough to just normalize audio level prior to upload and/or use a compressor on the audio because us folks on laptops have problems hearing your exceptionally good videos. Thank you for the content! :D
@w2aew
@w2aew 7 жыл бұрын
Nice video! A couple of notes for you... Power trigger BW adjustment, trigger time qualification, frequency mask trigger, and more - all come along with the benchtop RSAs. When replaying data, you can use the Replay toolbar to re-analyze previous acquisitions that are stacked up in memory. One thing that would've been interesting to look at with the drone TX would be to "zoom" the time-scale on the Spectrogram - this increases the FFT overlap and may even reveal some modulation characterstics (depending on RBW settings vs symbol rate, of course). We're considering adding zero-span to the TG- but not available right now. Great job, as always.
@Thesignalpath
@Thesignalpath 7 жыл бұрын
Thanks! Is there a reason why more advanced triggering is not available on these units and is available on the bench instruments? Is there a technical limitation or just feature management?
@w2aew
@w2aew 7 жыл бұрын
Mainly due to the hardware/software delineation. Triggers are generated in the "brick", whether it is an external electrical trigger, or a RF Power Trigger. The unit doesn't do any of RF decimation in hardware. Sampled IF data is what is being transferred over the USB3 port. The packets contain sampled IF data, calibration data, and time & trigger stamps. Since no additional RF processing occurs in the unit, there isn't much more that can be applied to the trigger system. The conversion to IQ occurs in the host-PC's API. Since user's PC performance will vary greatly, it isn't practical/reliable to perform time-critical trigger processing at that level. In the benchtop instruments, additional trigger processing is handled in the realtime hardware/firmware (FPGA or GPU, depending on the instrument).
@Thesignalpath
@Thesignalpath 7 жыл бұрын
Makes sense, I figured that there is probably no hardware processing on the date directly on the unit. It would be extra tough especially for the battery powered unit.
@w2aew
@w2aew 7 жыл бұрын
Yes - realtime processing on 40MHz wide data would substantially increase power requirements.
@joes5669
@joes5669 2 жыл бұрын
@@w2aew Thank you for your contribution to this discussion. It was very valuable.
@thomashoffmann9646
@thomashoffmann9646 3 жыл бұрын
I do not understand all, but watching a lot of your videos my knowledge increase. MANY Thanks from Micro-Precision Audio Lab.
@daveblane6442
@daveblane6442 7 жыл бұрын
Always always GREAT stuff, even tho' it is WAY over my head many times. THANK you, Shariar!
@rogeronslow1498
@rogeronslow1498 7 жыл бұрын
Excellent review. It's not often I have the patience to watch long videos but yours I normally watch from start to finish. I would have liked to see how it interfaces to Signalvue though. Thank you.
@laneboysrc
@laneboysrc 7 жыл бұрын
Great to see an experiment with an RC transmitter! Usually when we reverse engineer RC protocols we look at the baseband side of the RF chips. Those are usually off-the-shelf components, so data sheets are easy to come by to decode register settings. The RCGroups.com DIY electronics forum is a great resource btw. for all sorts of RC electronics stuff. But more and more the MCU and RF gets integrated in a single chip, making reverse engineering harder. Tools like these will make sure we can maintain interoperability in the future. Thanks for your interesting review and teachings!
@robertwatsonbath
@robertwatsonbath 7 жыл бұрын
Thanks Shahriar, a very nice tour of the inside and outside of the RSA607A. Interesting note about triggering bandwidth being the full RT bandwidth - never thought about that before. If I'm being pedantic, measuring the reflection from the same load you used for calibration at 51:00 tells you virtually nothing about how good the calibration actually is of course. I wish the Minicircuits ANNE-50+ did have a RL of 60dB at 4GHz! :)
@jluke6861
@jluke6861 Жыл бұрын
Thank you.
@soiTasTic
@soiTasTic 7 жыл бұрын
Nice
@joes5669
@joes5669 2 жыл бұрын
Knew you'd address the conformal coating in the one area of the PCB!
@TimLF
@TimLF 7 жыл бұрын
Thanks for the positive review. Bell Labs made Unix 44 years ago, It would be nice if you used one of it's popular descendants (Debian/Ubuntu or Fedora/CentOS) and let us know what USB electronic test equipment we can use with Unix like systems... I find your repairs most interesting, keep up the good work.
@AF6LJSue
@AF6LJSue 7 жыл бұрын
:) Thanks That was good.
@davebeerman
@davebeerman 7 жыл бұрын
Awesome Video, as always :) A note on the audio though: I like the microphone, i think it is an improvement. However, the audio level of your voice seems all in all quite low. Thanks for the great content!
@ribb4200
@ribb4200 7 жыл бұрын
Decoding 2.4GHz Radio Control is easier (and more exact) to use a low bandwidth oscilloscope to watch transmitter TX Data or receiver RX Data rather than the actual RF. Using a spectrum analyzer for this is too iffy unless there was a real need. Suffice to say you can see some RF data packets, but it is hopeless overkill to decode it on a spectrum analyzer. Regardless, thanks for showing the actual 2.4GHz RF.
@PlasmaHH
@PlasmaHH 7 жыл бұрын
Being used to seeing big 19" devices, the connectors somehow look so huge compared to the PCB size. Also did I miss why there is conformal coating on that one part?
@garretr4488
@garretr4488 Жыл бұрын
13:35
@flatfrog69rr71
@flatfrog69rr71 7 жыл бұрын
Hi thanks for another great video Can I ask you why are your bench and instruments so tidy? not a wire in site!!! your other half must be so pleased with you ! thanks once again
@Thesignalpath
@Thesignalpath 7 жыл бұрын
I just like to keep the lab clean. I hate messy places!
@gacherumburu9958
@gacherumburu9958 Жыл бұрын
👍👍
@IC2MpolytechLille
@IC2MpolytechLille 7 жыл бұрын
Tracking gen of this instrument can be used as a CW synthesizer by using a SCPI command. PM me for more info.
@nraynaud
@nraynaud 7 жыл бұрын
40°C during normalization, I hope it's the temperature inside the box, not ambient :)
@johnnyhart0
@johnnyhart0 7 жыл бұрын
Great video, as always, but please spend some time working on the audio levels. Very difficult to hear you sometimes.
@bfx8185
@bfx8185 7 жыл бұрын
I don't know but seems to be Tektronix is slower and slower. Isn't it? They try to catch performance but speed is really not enough.
@w2aew
@w2aew 7 жыл бұрын
As Shahriar stated several times, his PC was not quite up to the task to take full advantage of the realtime performance of the RSA607A.
@Thesignalpath
@Thesignalpath 7 жыл бұрын
I was running this on a three year-old laptop while doing screen capture. My faster computer had died and I had no choice. The SignalVu with all the USB instruments is fast and responsive.
7 жыл бұрын
'Education Version' is all over the place, especially when there are many subwindows opened. I guess it is because you don`t have commercial license (no reason to have in educational material) but still - it messes with the graphs :-( I wish Tektronix and others open their smaller/older designs (schematics, software, principle of work, rules applied when designing, etc.) so we can tinker with it and produce/buy it cheaply - of course also for educational purposes. If not that, than maybe they could start something like Open Source/Open Hardware multimeter, oscilloscope or spectrum analyzer campaign (with schematics, design, software, 3d printing/production). You know Shahriar, for those people who know enough but are unable to build something meaningful and practical ground-up alone. I`m sure community would be interested... :)
@FooBar89
@FooBar89 6 жыл бұрын
hmmm, the construction seems hacky
@JGnLAU8OAWF6
@JGnLAU8OAWF6 7 жыл бұрын
Doing audio Louis way? Still hear some reflections from the walls, through. UPD. And volume is too low.
@JetNmyFuture
@JetNmyFuture 7 жыл бұрын
If you are worried about the audio - you got nothing from the video. It is not bad and this is not a recording studio. Reflections from the walls, lol. It is recorded in a room. With walls. Not an anechoic chamber.
@JGnLAU8OAWF6
@JGnLAU8OAWF6 7 жыл бұрын
Well, he definitely is trying to make more valuable videos which require better sound. Watch EEVBlog stuff or even Louis Rossmann, audio is really good even through that is just his workplace, not a studio.
@JetNmyFuture
@JetNmyFuture 7 жыл бұрын
I was a location sound mixer for film and television for many years. We specifically did not want it to sound 'dead' like the person is talking directly into your ear. We even record the room ambient tones to mix them in later to disguise lavalier mic hidden in clothing from sounding too 'close'. To me, this video sounds natural and clear with no distracting noises like air-conditioning, traffic,, etc. I would not bother changing anything. I would rather see the effort and money go into the content, not Academy Award winning sound mixing.
@Thesignalpath
@Thesignalpath 7 жыл бұрын
Still trying to figure out the optimum settings. Hopefully it will get better with time.
@dentakuweb
@dentakuweb 7 жыл бұрын
It's just a little quiet but otherwise its fine. At first the room echo sounds strange because it's not what we're used to but you quickly forget about it.
@TMS5100
@TMS5100 7 жыл бұрын
and as usual, tek gouges you for every little tiny option. suprised that you don't have to pay extra for an enclosure. and that enclosure is, as dave jones would say, a bit "how ya doin". soooo cheap. ew.
@AureliusR
@AureliusR 6 жыл бұрын
Yeah, I am really really not a fan of Tek at the moment. Look how painfully slow this device is. Shah says his computer is slow, but realistically this isn't a hugely demanding task. Even processors a generation or two old should have no trouble doing the processing necessary. The MDO4000 was a shining example of this -- Tek seems to value features over usability. That scope is so unbelievably slow I would throw it out the window in frustration before getting any work done. For a spectrum analyzer billed as "real-time", a 1Hz update rate is pretty sad. I would like to see it connected to a brand-new PC with a Ryzen 7 or Core i9 to see if it makes any difference -- I suspect it won't.
What it feels like cleaning up after a toddler.
00:40
Daniel LaBelle
Рет қаралды 61 МЛН
KINDNESS ALWAYS COME BACK
00:59
dednahype
Рет қаралды 162 МЛН
Я нашел кто меня пранкует!
00:51
Аришнев
Рет қаралды 5 МЛН
Русалка
01:00
История одного вокалиста
Рет қаралды 7 МЛН
HP 8568B 1.5 GHz Spectrum Analyzer Repair
26:04
CuriousMarc
Рет қаралды 72 М.
The Micro Mechanisms in Your Phone
19:31
Breaking Taps
Рет қаралды 1,2 МЛН
How To Get Live Satellite Images Directly From Space
24:13
saveitforparts
Рет қаралды 467 М.
EEVblog 1566 - Rigol DHO800 12 Bit Oscilloscope FULL REVIEW
1:00:46
Choose a phone for your mom
0:20
ChooseGift
Рет қаралды 7 МЛН
EXEED VX 2024: Не өзгерді?
9:06
Oljas Oqas
Рет қаралды 46 М.
$1 vs $100,000 Slow Motion Camera!
0:44
Hafu Go
Рет қаралды 25 МЛН