outlaw-poet
commented
9 years ago There are some lower ISM bands that might work for you: the 433 Mhz ISM band might be easier for you to get to, if you don't want to go with 2.4 Ghz equipment. You can get cheap transceivers to code the 433, and use something like this: http://www.ebay.com/itm/like/131329127770?lpid=82&chn=ps to step it up to 2 watts or more.
Be aware you are still subject to Part 18 and Part 15 FCC rules in the ISM bands, so assuming you're building this device not for sale, and it's a perfect radiator that does not interfere with any non ISM band radios, you can go up to 500 watts, in theory, although they have field strength regulations that are a little arcane to figure out, so a strong directional antenna may be illegal well under that.
That said, if you annoy somebody by destroying their ISM reception, the FCC can still require a bunch of technical reporting on your device, and shut you down if you get anything wrong, which is how people get rid of Wi-Fi interfering sources.
On Mon, Dec 29, 2014 at 1:11 PM, SponjWorthy notifications@github.com wrote:
Yes I know enforcement is low, but if I build a dedicated and easily accessible node for me and my cohorts, it will be pretty easy to find my node if someone complains. Is there something in the ISM frequency bands that permit a >1w transmission? The 2.4Ghz ISM band appears promising but not a lot of Chinese radios work in that end of the spectrum, so sourcing affordable hardware is a barrier. I'd rather not donate my hardware or money to the FCC. Interestingly FRS and GMRS allow Morse code, but it's character set is not conducive to encrypted packets. The thought crossed my mind to just use an FRS radio and modify the protocol to use CW.
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SBrienz
Yes I know enforcement is low, but if I build a dedicated and easily accessible node for me and my cohorts, it will be pretty easy to find my node if someone complains. Is there something in the ISM frequency bands that permit a >1w transmission? The 2.4Ghz ISM band appears promising but not a lot of Chinese radios work in that end of the spectrum, so sourcing affordable hardware is a barrier. I'd rather not donate my hardware or money to the FCC. Interestingly FRS and GMRS allow Morse code, but it's character set is not conducive to encrypted packets. The thought crossed my mind to just use an FRS radio and modify the protocol to use CW.