>From all the previous talk I understand I may be way out of my league but from managing campus Wifi networks I learned that Israel afaik allows channels 1 through 13, while it limits channels 1-4 iirc to indoor use only (god knows how the intended to enforce that one)
2013/7/2 Geoffrey S. Mendelson <[email protected]>: > On 7/2/2013 9:13 PM, Micha Feigin wrote: > >> >> I'm currently working in the states, probably should check Israeli/USA >> law at some point. What I have now is this interesting setup which >> implements narrow bandwidth radar at the 2.4GHz range. As far as I know >> it is legal in the states (it uses readily available hardware as well) >> >> >> http://www.glcharvat.com/Dr._Gregory_L._Charvat_Projects/Cantenna_Radar.html > > > > Dr. Charvat has an amateur radio license, callsign N8ZRY. > > As for the 2.4 gHz band being available for unlicensed use for unapproved > devices I have no idea. I do know that it is NOT legal in Israel. > > There was a conflict between the IDF and Wifi and Bluetooth devices and the > IDF was given a huge sum of money to buy new equipment to get off the short > range bluetooth channels, and channels 4-8 of WIFI. > > Then Omri Sharon came back from vacation and showed his father some > WIFI/Bluetooth device and by order of the Prime Minister, all Bluetooth and > the EU Wifi channels were allowed. (1-12). > > However the power limit of 100 mW EIRP was strictly enforced and amateur > radio operators lost their ability to use higher power. > > 5.8 gHz was allowed here April 1, 2012. > > Still one would have to be careful what you do, placing a USB WIFI dongle or > a gain antenna of any sort inside a coffee can would raise the power beyond > the 100mW EIRP limit. > > The famous Pringles can antenna is illegal both in the US and Israel. So are > all of those $20 Yagi antennas on eBay, although if there is sufficient feed > line loss they would be legal in the US. > > I think the best thing to do would be to contact Charvat directly and ask > him for advice about what you can and cannot do. > > If you require an Amateur radio license, you can study for a technican class > license in the US in a weekend (there often are "cram" classes) and take the > test almost anywhere. If you are at MIT, I'm sure there is a radio club and > people to help you. > > If I were you while you were at it, I would go at least as far as a General > class license, the next step up. If you are an Israeli citizen, you can then > get an Israeli license without taking any tests, as long as you can prove > that you were studying in the US at the time. > > The MOC is legally required to accept your US license for conversion even if > you flew in for the weekend, took the test and flew home, but it is a lot > easier if you are living there when you take the test. > > Getting the equivalent of a General or Extra Class license in Israel is far > more difficult than it is in the US. > > > >> >> >> It basically connects a signal generator to a voltage controlled >> ocsilator with 200MHz bandwidth around 2.4GHz. >> I was looking to expand on this idea in the direction of the work by >> Dina Katabi from MIT CSAIL which require hacking the signal that the >> radar sends >> >> http://people.csail.mit.edu/fadel/wivi/ >> >> The trick is not to change spectrum or intensity, but play a bit with >> the signal modulation within the regulated frequency range. Most of the >> stuff could probably also be done within the legal / standard WIFI type >> communication, but I need finer control over timing / encoding which >> would probably be either very hard or impossible to achieve going >> through the regular network stack. >> > > That's very interesting. She uses standard WIFI hardware, channels and data > streams which would make it legal. > > More likely, what you will have to do to use WIFI hardware is not only > control the timing, but to figure out what bit patterns produce the signals > that you want. > > Note that the legality of WIFI equipment and signals are based upon the > transmitter, in the US it is legal to do almost anything with the receiver. > > You may want to look at the USB DVB-T dongles that are being used as > software defined radios. I don't know of any that work as high as 2.4gHz, > but there may be one by now. > > > > >> I am also looking at UWB / XBAND but that is a completely different >> discussion that involves people that are allowed to do it and very >> custom (expensive) hardware. > > > Way beyond this discussion. > > > Geoff. > > > -- > Geoffrey S. Mendelson, N3OWJ/4X1GM/KBUH7245/KBUW5379 > > _______________________________________________ > Linux-il mailing list > [email protected] > http://mailman.cs.huji.ac.il/mailman/listinfo/linux-il _______________________________________________ Linux-il mailing list [email protected] http://mailman.cs.huji.ac.il/mailman/listinfo/linux-il
