USB spectrum analyzer

It's an unserved market. You can get one based on a Winradio but IIRC it'll set you back north af $1500. Then there's the Icom R1500 for $600 or sans controller pod as the PCR1500 for around $500. Not much out there in terms of (reliable) spectrum analysis software, so to make it fancy you'd have to write some.

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If you feel ambitious this is a home brew 1GHz one.

Then again if you have a DSO they come with FFTmay be good enough for your purpose.

Most DSO have spectrum analyses capabilities. Just don't expect a wide dynamic range.

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It would need to go right down to DC, preferably with two channels so you can do I/Q. I'd love to have a dynamic signal analyzer equivalent that went up to at least 30 MHz. You could even do network analysis.

Cheers

Phil Hobbs

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Problem is, there isn't any market for this so you'd have to roll your own. Even 9kHz and up for regular pre-compliance is considered too small a market by some. Although I am convinced they are wrong about that because nobody has test-marketed any serious

Not very. +/-3dB would be good enough for most EMC pre-compliance. Dynamic range must be as large as possible though because you may have to hunt a wee spur inside an OEM system you don't know.

Not so much for EMC work. But when designing switchers or when people aren't careful with conducted EMI measurements, yes, it can die fast.

1GHz usually suffices. If you include 2.45GHz that creates a much larger market, that of all the "PC doctors" with their refurbed ambulances.

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Does the Ten-Tec USB VNA have a receive mode?

Steve

AFAIK it does not, like most VNA's don't :-(

Usually there's an I/Q detection with pretty much zilch in bandpassing before it. So they aren't very useful for that to begin with.

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Ok, this is rs232, not usb, and out of my budget at 250 euros, but getting closer.

click on hardware and there is a 0-30 mhz drm receiver.

Steve

Better link:

Steve

That's pretty low for today. That would mean you could put a scope- style diode bridge limiter in the input to protect the mixer...

Well, it would be cool if someone designed a thing like this.

I'd buy one.

"Raveninghorde" a écrit dans le message de news: snipped-for-privacy@4ax.com...

Hello, You can try them :

we have bought one of their RF series (HF6060-V4), usable for qualitative measurements at least if you connect it to a PC (the local LCD is, well, limited). Not top range performances, but cheap. Friendly, Robert

Thanks, that's better because there was not hardware link. But 250 Euros for max 30MHz? I can't really get very far with that. Might be ok for the OP though.

I wonder why they are still advertising DRM. AFAICT that's pretty much dead. As I had been predicting ... :-)

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A limiter? Well, maybe I should get cracking on the design then. Oh wait, I live in Taxafornia, darn ;-)

Just a diode clipper ain't cutting it for spectrum because you get intermodulation galore. Neighbor answers his cell ... ka-crash.

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Would be nice if they made one for the typical EMC pre-compliance range from 150kHz to 1GHz. Had a chat with the key designer, and it seems they either don't see that market or don't want to play there (which would be very weird).

How does yours behave in the presence of large inband signals?

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I would recomend the HF-60100 V4. We use it for our EMC tests and it works nice even down to 150kHz (on the website they only talk about

1MHz, propably thats the "made in germany" reserve...). Just as a note: For EMC tests dont forget that you need to add some options to that unit like internal and external preamp and a biconical antenna "BicoLOG 30100". Anyway its still much cheaper then EMC tests in a lab :-)

Mark

Yeah, I was told it does go lower than the datasheet. However, the V4 is priced quite steeply.

This is pretty cool:

Anyhow, it all pre-compliance and doesn't replace the trip to the EMC lab. The measurement precision is quite a bit different there. The last step must be unobstructed free range and properly weighted receiver logging. In winter that's not always pleasant but it has to be done.

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The total price was about 5000 Euros for our whole kit. Quite cheap if you compare it to lab tests. We also compared the spectran results vs lab plots of two test units, which failed in the lab (EN55022). The diagrams are within 2dB. Thats very good for only 5k euros so i dont think we need any lab test in future any more.

Mark