Re: [Discuss-gnuradio] help with "safe" and "clean" band
> Would running your tests with all your equipment inside of a Faraday > cage be possible? In my dreams my lab is all a Faraday cage :-). Now back to reality :-( M. > > On Thu, Jun 12, 2008 at 12:24 PM, Mihail L. Sichitiu <[EMAIL PROTECTED]> > wrote: > > > > Hi there, > > > > I'm brand new at this GNU Radio thing, so please forgive me if my question > > has a "well-known" answer. I'd like to try out some performance tests on a > > few modulation schemes, so I need a clean band for these tests. Obviously > > the 2.4GHz ISM band is full of interference, and I assume that this goes > > for all the other ISM bands, right? > > > > If this is the case, is there a well-known relatively quiet band where I > > can run these tests without interfering with anything important, without > > being interfered with, and without getting in trouble with FCC? > > > > I imagine that if I'd have all the daughter boards I could do a long-term > > (1-2 days) scan and find a quiet band and play in there (the tests are > > likely short and low powered). The problem is that I only have the 2.4GHz > > daughter-boards and I'd like to buy only the "right" daughter-boards (as > > opposed to all of them to find an empty band). > > > > Thanks for the help, > > Mihai > > > > > > > > > > ___ > > Discuss-gnuradio mailing list > > Discuss-gnuradio@gnu.org > > http://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > > > > > -- Whatever you are, be a good one. Abraham Lincoln ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] help with "safe" and "clean" band
Yes, a cable would be nice and easy, but I'm also planning for a "demo", and the cable would spoil the effect :-). Additionally, I'm looking for multiplexing (multiple parallel transmissions) and there the cable doesn't help. Thanks, Mihai On Thu, 12 Jun 2008, Martin Dvh wrote: > Mihail L. Sichitiu wrote: > > Hi there, > > > > I'm brand new at this GNU Radio thing, so please forgive me if my question > > has a "well-known" answer. I'd like to try out some performance tests on a > > few modulation schemes, so I need a clean band for these tests. Obviously > > the 2.4GHz ISM band is full of interference, and I assume that this goes > > for all the other ISM bands, right? > > > > If this is the case, is there a well-known relatively quiet band where I > > can run these tests without interfering with anything important, without > > being interfered with, and without getting in trouble with FCC? > The easiest thing to do would be not doing your tests wireless. > Connect TX twith coax to an attenuator and connect that to the RX side with > coax. > That is about as clean as you can get, and you won't interfere with anyone on > any band. > > Make sure you use enough attenuation. The RFX2400 TX side has much more power > at its output then the RX side can handle. > You will blow up your daughterboards if you don't have at least 30 dB > attenuation. > > The best attenuators I found for high frequencies are the SMA inline types > You can mount them directly at the TX output and connect a SMA-SMA coax to > the RX side of a second RFX2400. > > Things are much more relaxed with basicRX and basicTX. > basicRX can be connected directly to basicTX without any chance of damage. > > I do a lot of my testing with basicRX and basicTX. > The output of basicTX is also very low which is an advantage in this case. > > Greetings, > Martin > > > > > > I imagine that if I'd have all the daughter boards I could do a long-term > > (1-2 days) scan and find a quiet band and play in there (the tests are > > likely short and low powered). The problem is that I only have the 2.4GHz > > daughter-boards and I'd like to buy only the "right" daughter-boards (as > > opposed to all of them to find an empty band). > > > > Thanks for the help, > > Mihai > > > > > > > > > > ___ > > Discuss-gnuradio mailing list > > Discuss-gnuradio@gnu.org > > http://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > > > -- Whatever you are, be a good one. Abraham Lincoln ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] help with "safe" and "clean" band
Would running your tests with all your equipment inside of a Faraday cage be possible? On Thu, Jun 12, 2008 at 12:24 PM, Mihail L. Sichitiu <[EMAIL PROTECTED]> wrote: > > Hi there, > > I'm brand new at this GNU Radio thing, so please forgive me if my question > has a "well-known" answer. I'd like to try out some performance tests on a > few modulation schemes, so I need a clean band for these tests. Obviously > the 2.4GHz ISM band is full of interference, and I assume that this goes > for all the other ISM bands, right? > > If this is the case, is there a well-known relatively quiet band where I > can run these tests without interfering with anything important, without > being interfered with, and without getting in trouble with FCC? > > I imagine that if I'd have all the daughter boards I could do a long-term > (1-2 days) scan and find a quiet band and play in there (the tests are > likely short and low powered). The problem is that I only have the 2.4GHz > daughter-boards and I'd like to buy only the "right" daughter-boards (as > opposed to all of them to find an empty band). > > Thanks for the help, > Mihai > > > > > ___ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > http://lists.gnu.org/mailman/listinfo/discuss-gnuradio > -- I live in a world of cold steel and dungeons and mighty foes... ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] help with "safe" and "clean" band
Mihail L. Sichitiu wrote: > Hi there, > > I'm brand new at this GNU Radio thing, so please forgive me if my question > has a "well-known" answer. I'd like to try out some performance tests on a > few modulation schemes, so I need a clean band for these tests. Obviously > the 2.4GHz ISM band is full of interference, and I assume that this goes > for all the other ISM bands, right? > > If this is the case, is there a well-known relatively quiet band where I > can run these tests without interfering with anything important, without > being interfered with, and without getting in trouble with FCC? The easiest thing to do would be not doing your tests wireless. Connect TX twith coax to an attenuator and connect that to the RX side with coax. That is about as clean as you can get, and you won't interfere with anyone on any band. Make sure you use enough attenuation. The RFX2400 TX side has much more power at its output then the RX side can handle. You will blow up your daughterboards if you don't have at least 30 dB attenuation. The best attenuators I found for high frequencies are the SMA inline types You can mount them directly at the TX output and connect a SMA-SMA coax to the RX side of a second RFX2400. Things are much more relaxed with basicRX and basicTX. basicRX can be connected directly to basicTX without any chance of damage. I do a lot of my testing with basicRX and basicTX. The output of basicTX is also very low which is an advantage in this case. Greetings, Martin > > I imagine that if I'd have all the daughter boards I could do a long-term > (1-2 days) scan and find a quiet band and play in there (the tests are > likely short and low powered). The problem is that I only have the 2.4GHz > daughter-boards and I'd like to buy only the "right" daughter-boards (as > opposed to all of them to find an empty band). > > Thanks for the help, > Mihai > > > > > ___ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > http://lists.gnu.org/mailman/listinfo/discuss-gnuradio > ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] help with "safe" and "clean" band
On Thu, Jun 12, 2008 at 12:24 PM, Mihail L. Sichitiu <[EMAIL PROTECTED]> wrote: > > Hi there, > > I'm brand new at this GNU Radio thing, so please forgive me if my question > has a "well-known" answer. I'd like to try out some performance tests on a > few modulation schemes, so I need a clean band for these tests. Obviously > the 2.4GHz ISM band is full of interference, and I assume that this goes > for all the other ISM bands, right? > > If this is the case, is there a well-known relatively quiet band where I > can run these tests without interfering with anything important, without > being interfered with, and without getting in trouble with FCC? > > I imagine that if I'd have all the daughter boards I could do a long-term > (1-2 days) scan and find a quiet band and play in there (the tests are > likely short and low powered). The problem is that I only have the 2.4GHz > daughter-boards and I'd like to buy only the "right" daughter-boards (as > opposed to all of them to find an empty band). > > Thanks for the help, > Mihai > Welcome to GNURadio. I'm not sure which bands will be noisy for you, a lot depends on your location and what's around you. The best thing to do is use a spectrum analyzer, if you have access to one, and see what's out there. If you don't have one, you can fake it by using usrp_fft.py and scanning around in frequency, looking for interferers, etc. How "clean" is "clean"? If your signal is strong enough, your SNR should be plenty high to run your tests. If you truly need a very quiet environment, you may need access to special facilities, such as an anechoic chamber. HTH -Steven ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] help with "safe" and "clean" band
Hi there, I'm brand new at this GNU Radio thing, so please forgive me if my question has a "well-known" answer. I'd like to try out some performance tests on a few modulation schemes, so I need a clean band for these tests. Obviously the 2.4GHz ISM band is full of interference, and I assume that this goes for all the other ISM bands, right? If this is the case, is there a well-known relatively quiet band where I can run these tests without interfering with anything important, without being interfered with, and without getting in trouble with FCC? I imagine that if I'd have all the daughter boards I could do a long-term (1-2 days) scan and find a quiet band and play in there (the tests are likely short and low powered). The problem is that I only have the 2.4GHz daughter-boards and I'd like to buy only the "right" daughter-boards (as opposed to all of them to find an empty band). Thanks for the help, Mihai ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re : Re : [Discuss-gnuradio] Radar receiver
Thank you very much for all your explanations. I could store the echoes in a file but I can't open it to treat datas that it contains Could you tell me : whats the file contain (I ? ,Q, ?) What's size of echos ? The echoes store are after or before pulse compress process ? we use big or short endian ? Thanks. - Message d'origine De : Naoufel Amri <[EMAIL PROTECTED]> À : Johnathan Corgan <[EMAIL PROTECTED]>; discuss-gnuradio@gnu.org Envoyé le : Samedi, 7 Juin 2008, 11h54mn 36s Objet : Re : [Discuss-gnuradio] Radar receiver Thank you Johnathan for your help ; But where the echo returns complex are stored ? how can I get them back? Cordially! Naoufel (University Paris IX UFR Télécoms) - Message d'origine De : Johnathan Corgan <[EMAIL PROTECTED]> À : Naoufel Amri <[EMAIL PROTECTED]> Cc : discuss-gnuradio@gnu.org Envoyé le : Samedi, 7 Juin 2008, 2h09mn 42s Objet : Re: [Discuss-gnuradio] Radar receiver On Fri, Jun 6, 2008 at 4:02 AM, Naoufel Amri <[EMAIL PROTECTED]> wrote: > Do you know if the receiver function of "usrp_radar_mono.py" is complete? > If yes,where are the datas ,which are recovered by the receiver, store ? And > how can I get them back? The gr-radar-mono transceiver records, during the programmed range gate, the raw echo returns in a complex baseband format. You will need to post-process these using your algorithm of choice. -- Johnathan Corgan Corgan Enterprises LLC http://corganenterprises.com/ _ Envoyez avec Yahoo! Mail. Une boite mail plus intelligente http://mail.yahoo.fr___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
