Hey fellow EE enthusiasts,
tl;dr version: Am I allowed to encode digital data over a audio channel used in portable radios in Belguim? (freely available and legal to use portable radios)
For a project I was looking at using "cheap" radios (the .5W radios in the 440MHz bands you can get and use without licence in belguim). EG:
http://www.portofoonwinkel.nl/kenwood-tk-3501-protalk-portofoon/pid=32136I wanted to use them as a cheap quick radio that I know is "legal" and works. I would just encode the bitstream on the audiochannel. Seeing as some of the cheaper models come in at 20-25 euros a piece, I don't think I can build my own wireless system that can compete (I need very low datarates) at that cost.
However, when I pitched the idea to someone on the internet, he told me I should watch out with encoding digital data into a voice channel. He told me that where he lives, this is not legal, since the channels are reserved for "voice" audio.
Started looking on the internet, but couldn't seem to find a quick anwser to whether or not this is legal in Belguim. The reason I worry is because the end device will likely be used by someone in an official manner, so he has to be sure that his devices are not transmitting in reserved bands or in non-legal ways. Does anyone know/can anyone point me in the right direction for finding out? Reading through hundreds of pages of legal documents is not something I'm looking forwards to.