USB spectrum analyzer
in [Design]
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From: Joerg on 3 Oct 2009 19:00 Phil Hobbs wrote: > Joerg wrote: >> Raveninghorde wrote: >>> I'm looking for a USB spectrum analyzer for occasional use. >>> >>> My immediate requirement is to cover the range 100kHz to 3MHz but up >>> to 30MHz would be good. >>> >>> Any recommendations based on personal experience? >> >> >> 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. >> > > 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. > 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 <$1k gear there. -- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM.
From: a7yvm109gf5d1 on 3 Oct 2009 20:48 On Oct 3, 6:00 pm, Joerg <inva...(a)invalid.invalid> wrote: > > 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 <$1k gear there. How accurate and linear and flat would it have to be? The usual diode-mixer front end would be as fragile as always, it would be easy to damage, no? And how high is "up"? 2GHz? 200GHz? THz?
From: Joerg on 3 Oct 2009 20:59 a7yvm109gf5d1(a)netzero.com wrote: > On Oct 3, 6:00 pm, Joerg <inva...(a)invalid.invalid> wrote: >> 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 <$1k gear there. > > How accurate and linear and flat would it have to be? 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. > The usual diode-mixer front end would be as fragile as always, it > would be easy to damage, no? 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. > And how high is "up"? 2GHz? 200GHz? THz? 1GHz usually suffices. If you include 2.45GHz that creates a much larger market, that of all the "PC doctors" with their refurbed ambulances. -- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM.
From: osr on 4 Oct 2009 10:33 Does the Ten-Tec USB VNA have a receive mode? Steve
From: Joerg on 4 Oct 2009 12:15
osr(a)uakron.edu wrote: > Does the Ten-Tec USB VNA have a receive mode? > 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. -- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM. |