tag:blogger.com,1999:blog-37798047.post8984071077071929646..comments2024-01-16T05:48:33.523-05:00Comments on Errata Security: ProxyHam conspiracy is nonsenseDavid Maynorhttp://www.blogger.com/profile/09921229607193067441noreply@blogger.comBlogger13125tag:blogger.com,1999:blog-37798047.post-45819339852570441402015-07-17T23:21:19.821-04:002015-07-17T23:21:19.821-04:00I'm so expected to hear your speech on the top...I'm so expected to hear your speech on the topic. : )Anonymoushttps://www.blogger.com/profile/15511804874145539746noreply@blogger.comtag:blogger.com,1999:blog-37798047.post-75203493182166305082015-07-17T08:05:14.186-04:002015-07-17T08:05:14.186-04:00The directional antenna thing would still tell the...The directional antenna thing would still tell the tower exactly how far away you are (speed of light and all that; yes, GSM really depends on that).<br /><br />The problem is that when you're in a city, everybody else is <300m to the next tower, only you are talking to a cell much farther away than that ?? your signal sticks out like a sore thumb. You don't want that if you've got to hide something.smurfixhttps://www.blogger.com/profile/02846176827268520748noreply@blogger.comtag:blogger.com,1999:blog-37798047.post-21186535904088496122015-07-15T19:09:08.130-04:002015-07-15T19:09:08.130-04:00Would the directional antenna & cellphone idea...Would the directional antenna & cellphone idea work? e.g. do cell phones insert a timing delay into the signals to allow for the distance between the transmitter tower and the phone? If your cell phone was at a large distance, the delay value would still be larger than every other phone connected to the cell.Richardhttps://www.blogger.com/profile/07455416707823978691noreply@blogger.comtag:blogger.com,1999:blog-37798047.post-54617151120393471112015-07-15T07:30:27.105-04:002015-07-15T07:30:27.105-04:00You don't think the FBI might want to serve up...You don't think the FBI might want to serve up an NSL to get the customer list? That the FBI would consider anyone buying one as "suspicious"? Oh noez, think of the terrorizmz!Synchttps://www.blogger.com/profile/16295109406735520572noreply@blogger.comtag:blogger.com,1999:blog-37798047.post-48472520165038044222015-07-15T05:13:11.888-04:002015-07-15T05:13:11.888-04:00Less directivity and lower gain are irrelevant as ...Less directivity and lower gain are irrelevant as long as yours is good enough; the gain works for transmission as well as reception. If you look at the antennas used to bounce UHF signals off the moon you can be sure these things will be unfazed in the view of a few degrees downward tilt at the cell tower. The real problem is exactly the one Bodhan has pointed out: GSM and friends depend on each phone transmitting exactly in its allocated time slot, and to allocate these slots they have to account for signal propagation delays, i.e. they measure the distance to a phone by nanosecond timing of its signal. The base stations simply aren't fooled by directional antennas.mbethkehttps://www.blogger.com/profile/08482015215897224650noreply@blogger.comtag:blogger.com,1999:blog-37798047.post-3554876731155412322015-07-14T14:46:44.671-04:002015-07-14T14:46:44.671-04:00Yes, ignore all the other comments and point your ...Yes, ignore all the other comments and point your directional antenna, from "several cells away", straight at a 30 degree panel antenna (less directivity and lower gain than yours) that is down tilted (not pointed back at you) and see how that works out. <br /><br />Although I doubt it will give the desired result, it will be a fun project and invaluable learning experience.<br />Anonymoushttps://www.blogger.com/profile/13459018427838152522noreply@blogger.comtag:blogger.com,1999:blog-37798047.post-80745589033120568012015-07-14T14:26:26.315-04:002015-07-14T14:26:26.315-04:00"Take a cellphone ... connect it to a highly ..."Take a cellphone ... connect it to a highly directional antenna pointed at a distant cell tower ... I don't know enough about how to block signals in other directions, though -- radio waves are hard."<br /><br />Not that hard really. Your directional antenna works in 2 ways exactly the same. It acts like horse-blinders so your receiver can only hear what the antenna is pointed at, so all other cell towers cease to exist. It also acts like putting your hands on either side of your mouth while yelling, so your transmission only reaches the tower your antenna is aimed at. Of course there can be slight spill or scattered emissions in other directions, depending on your antenna or dish, but they'd be weak and insubstantial.<br /><br />Ignore the other comments. They're, like you, thinking in terms of a phone with an omnidirectional antenna even though you're using a directional antenna or dish. No other towers should hear you, or if they do it's background scatter and cannot be used for predicting position. Cellular triangulation presumes omnidirectional Tx/Rx.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-37798047.post-45639297812467026422015-07-14T12:18:45.337-04:002015-07-14T12:18:45.337-04:00The directional pointed to a spot some distance ou...The directional pointed to a spot some distance out from the base of the tower might actually work better as cell towers have sectorized antennas with a 3 degree down tilt. You will need the "skip" to work in both directions to have both a good link and to spoof the cell tower location services.Anonymoushttps://www.blogger.com/profile/13459018427838152522noreply@blogger.comtag:blogger.com,1999:blog-37798047.post-81358725572550460922015-07-14T03:46:34.372-04:002015-07-14T03:46:34.372-04:00A satellite dish pointed at the ground in the dire...A satellite dish pointed at the ground in the direction of the cell tower that you want to use would do the trick.Truthhttps://www.blogger.com/profile/05200632807396498756noreply@blogger.comtag:blogger.com,1999:blog-37798047.post-67194642876377294062015-07-14T01:46:58.982-04:002015-07-14T01:46:58.982-04:00Bohdan: Perhaps if you're far enough away you ...Bohdan: Perhaps if you're far enough away you can cause GSM's Timing Advance to wrap around>Unknownhttps://www.blogger.com/profile/11696134553129818635noreply@blogger.comtag:blogger.com,1999:blog-37798047.post-46816218501194774712015-07-14T01:44:17.316-04:002015-07-14T01:44:17.316-04:00Also, it would be great to use such devices as rep...Also, it would be great to use such devices as repeaters in a relatively big area to build a free, private and censor-free intranetSimonehttps://www.blogger.com/profile/03031927327347469991noreply@blogger.comtag:blogger.com,1999:blog-37798047.post-79154087084464597302015-07-13T22:33:31.715-04:002015-07-13T22:33:31.715-04:00It's very hard not to love you, Robert.It's very hard not to love you, Robert.wodimhttps://www.blogger.com/profile/05759170632576250688noreply@blogger.comtag:blogger.com,1999:blog-37798047.post-90609768248231719532015-07-13T22:28:53.546-04:002015-07-13T22:28:53.546-04:00About 40 years ago the USA imposed a 55 MPH nation...About 40 years ago the USA imposed a 55 MPH nationwide speed limit. One tag line was "it's not just a good idea, it's the law". Some wag quickly turned that into something like "186,282 miles per second. It's not just a good idea, it's the law".<br /><br />Which is a longabout way of saying that a cell tower <b>knows</b> exactly how far away you are. The technology depends on it. And it usually knows the general direction (to perhaps 60 or 120 degrees).Anonymoushttps://www.blogger.com/profile/12036239834539661325noreply@blogger.com