USB spectrum analyzer
in [Design]
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From: Joerg on 5 Oct 2009 13:00 a7yvm109gf5d1(a)netzero.com wrote: > On Oct 3, 7:59 pm, Joerg <inva...(a)invalid.invalid> wrote: >> 1GHz usually suffices. If you include 2.45GHz that creates a much larger >> market, that of all the "PC doctors" with their refurbed ambulances. > > 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. 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. -- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM.
From: Joerg on 5 Oct 2009 13:02 Robert Lacoste wrote: > "Raveninghorde" <raveninghorde(a)invalid> a �crit dans le message de news: > 2u3fc5tf140ooisit15bsd2e47d4coouv9(a)4ax.com... >> 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? > > Hello, > You can try them : http://www.spectran.com/ > 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 > 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? -- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM.
From: Zulu on 7 Oct 2009 17:47 On Oct 5, 7:02 pm, Joerg <inva...(a)invalid.invalid> wrote: > Robert Lacoste wrote: > > "Raveninghorde" <raveninghorde(a)invalid> a écrit dans le message de news: > > 2u3fc5tf140ooisit15bsd2e47d4coo...(a)4ax.com... > >> 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? > > > Hello, > > You can try them :http://www.spectran.com/ > > 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 > > 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? > > -- > Regards, Joerg > > http://www.analogconsultants.com/ > > "gmail" domain blocked because of excessive spam. > Use another domain or send PM. 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
From: Joerg on 7 Oct 2009 17:57 Zulu wrote: > On Oct 5, 7:02 pm, Joerg <inva...(a)invalid.invalid> wrote: >> Robert Lacoste wrote: >>> "Raveninghorde" <raveninghorde(a)invalid> a �crit dans le message de news: >>> 2u3fc5tf140ooisit15bsd2e47d4coo...(a)4ax.com... >>>> 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? >>> Hello, >>> You can try them :http://www.spectran.com/ >>> 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 >> 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? >> >> -- >> Regards, Joerg >> >> http://www.analogconsultants.com/ >> >> "gmail" domain blocked because of excessive spam. >> Use another domain or send PM. > > 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...). Yeah, I was told it does go lower than the datasheet. However, the V4 is priced quite steeply. > 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 :-) > This is pretty cool: http://www.kaltmancreationsllc.com/invisibleWaves.html 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. -- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM.
From: Zulu on 8 Oct 2009 02:54
On Oct 7, 11:57 pm, Joerg <inva...(a)invalid.invalid> wrote: > Zulu wrote: > > On Oct 5, 7:02 pm, Joerg <inva...(a)invalid.invalid> wrote: > >> Robert Lacoste wrote: > >>> "Raveninghorde" <raveninghorde(a)invalid> a écrit dans le message de news: > >>> 2u3fc5tf140ooisit15bsd2e47d4coo...(a)4ax.com... > >>>> 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? > >>> Hello, > >>> You can try them :http://www.spectran.com/ > >>> 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 > >> 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? > > >> -- > >> Regards, Joerg > > >>http://www.analogconsultants.com/ > > >> "gmail" domain blocked because of excessive spam. > >> Use another domain or send PM. > > > 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...). > > Yeah, I was told it does go lower than the datasheet. However, the V4 is > priced quite steeply. > > > 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 :-) > > This is pretty cool: > > http://www.kaltmancreationsllc.com/invisibleWaves.html > > 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. > > -- > Regards, Joerg > > http://www.analogconsultants.com/ > > "gmail" domain blocked because of excessive spam. > Use another domain or send PM. 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 |