Buy an Axon, Axon II, or Axon Mote and build a great robot, while helping to support SoR.
0 Members and 1 Guest are viewing this topic.
http://www.sparkfun.com/commerce/product_info.php?products_id=9086No words.... No....
The modules are optimized for use in US and Canada.
two old cell phones (can be found in dumpsters sometimes) and a bit of hacking, and you have a 2W encrypted link
without paying, the radio modules can be used independantly. The paying part is contained within the phone companies communications software layer.the radio modules would normally connect straight to a proper transmitter / receiver station which then routes your call either through existing land lines or satellites. its only here that you are using their service. so if you dont let the radio module connect to the station then theres no need for any charges cause youre not using their services.
Hi,Yes, they'll probably be illegal in Europe.Don't see why anyone would buy them though - two old cell phones (can be found in dumpsters sometimes) and a bit of hacking, and you have a 2W encrypted link
Are any good write-ups on how to do this available? It sounds intriguing.
umm hacking old cell phones to transmit your own data is illegal.
Once you start hacking it to send your own signals then your gonna confuse cell towers and provide noise on those frequencies.
Then the cell company is gonna investigate who is transmitting on their stuff
and using really cool equipment (I have played with some of it) find you and then call the cops. Unless the FCC finds you first.
and cell phones use GSM or CDMA encoding so unless you encode your data into one of those protocols then your not going to get anything on the other end.
Not sure about GSM but when your cell phone transmits it uses a bandwidth that is huge and spreads the signal over a large area then uses complex math to extract the signal from the noise. You put a standard signal in that bandwidth and every cell phone in the area will be get interference.
Hmmm, despite the 'up to 15 mile range', it says '9.6 kbps throughput data rate' . . . impressive range, but you can't transmit much at that data rate . . .But hey, transmitting GPS coordinates to find your UAV after it runs away could be useful!
Oh well, there's still one charge remaining... Your batteries
Quote from: Soeren on March 05, 2009, 04:16:45 PMOh well, there's still one charge remaining... Your batteries Thats correct they are illegal in Europe, in a lot of countries more also. Maximum power allowed in Europe is 100mW (free) above these figures you are going to need a permit.900Mhz is the old GSM network, but still in use....
That's why they can only nag about 2.4GHz model pilot systems...They are interfere with WiFi companies selling internet on wifi....But since 2.4GHz is a free band.... Not exceptions...I think that a 800 something or a 900 something frequency that it's close to mobile freqs...is open... take an example ZigBee modules...And ZigBee Pro is supposed to have some miles range...Since frequency pollution is great in many many countries, only smart software can solve the channel problem...
We are talking about hacking the radio to transmit a different signal. As it is now the signal is sent out and captured by a tower then routed and sent to the second phone. This takes their system and paid services. Now you hack the phone and build a transmitter/receiver pair out of them. This sends illegal signals inside their protected bands. That is whats illegal. Not the hacking but the transmitting. Same as if you reconfigure your ham radio equipment to broadcast at 89.5 Mhz in Pensacola, Fl. then I come hunt you down and send the cops after you because I have the legal right given by the FCC to broadcast in this area on the frequency. Well my company has the right not me personally but you get the idea. Even if no one is using the frequency they are protected by the FCC. Only a few frequencies are open to transmit on and most of those require a license with the exception of CB but only a low wattage.
Question, hypothetically, if you were a radio station and somebody who doesn't like you broadcasts on your frequency (completely overpowering your signal within 1km of his house, lets say), what would the response be and how fast would it be? I mean, would it be the police who get involved? Would they make an arrest? Immediately?How fast can you pinpoint a location and what kind of evidence do you need before anything is done about it?