It depends. Is it for commercial use, or just for a hobby? If it's not for commercial use, you can use HAM radio (probably the 3 meter band), assuming that you have a HAM radio license. You would likely use high-gain Yagi antennas at both ends of the link. See my footer for more information about getting your HAM radio license.David lopez said:
What does it mean for the signal to travel through a town and why would you want to do that? Is this for a real project? What, exactly, are you trying to do?David lopez said:
I think he's trying to tempt PF into yet another futile discussion about a project that is just a thought exercise. (But not thought out at all.)russ_watters said:
Not for 100 miles through a town. Buildings contain metal, which reflects and diffracts EM waves. Those redirections of the EM waves cause multipath interference at receivers, which significantly reduce performance and path/channel distance. Even when the obstructions are just trees and foliage, you will still get a lot of attenuation of the signal due to partial absorption (depending on the frequency of the EM being used).David lopez said:
So you live here?David lopez said:
Get your HAM radio license, and you can do all that kind of stuff. Plus you can use your local HAM club as a learning resource. It's inexpensive and pretty easy to get your license. PM me if you need more information about how to do it.David lopez said:
Ahh, thanks, I hadn't seen the other threads (or maybe I did but didn't notice a pattern...). In that case we should be giving the OP a shorter leash on asking uselessly vague questions...sophiecentaur said:
For distances over 100 miles I'd recommend shortwave band, preferably around 10 Mhz. Get decent transceivers (they are not so cheap). For aerials, the simplest design would be 6-8 m long 1/4 wave vertical wire. Insulated litz cable or just a coax of sufficient length would do. Good luckDavid lopez said:
AND an amateur radio license as has been said several times earlierzoki85 said:
And years in the slammer.Borek said:
Regulations and laws differ from country to country , from place to place. One should be careful and make sure not to break laws by illegal broadcasting. Speaking of risks I can tell you that I think it is more likely and unpleasant, if you live in (sub)urban area like I do, to experience a visit from angry neighbours...Borek said:
The location for a radio relay station should be chosen based on factors such as terrain, line of sight, and availability of power and internet connectivity. It is important to conduct a site survey to determine the best location for optimal signal strength and coverage.
The basic equipment needed to build a radio relay station includes antennas, transmitters, receivers, amplifiers, and power sources. In addition, you may also need other equipment such as cables, connectors, and lightning protection devices.
To ensure the security of your radio relay station, you can implement measures such as physical barriers, surveillance cameras, and alarm systems. It is also important to regularly monitor and maintain the equipment to prevent any unauthorized access or tampering.
There are two main types of radio relay stations: analog and digital. Analog stations use analog signals to transmit information, while digital stations use digital signals. Within these two categories, there are also different types such as microwave, satellite, and cellular relay stations.
The regulations and licenses required to build a radio relay station vary depending on the country and region. In general, you will need to obtain a license from the government agency responsible for regulating communication and broadcasting. It is important to research and comply with all necessary regulations and licenses before building a radio relay station.