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- Radio and communication technologies are recurring topics. Here are a few quick start notes
- --[Range]-----
- Yes, radio communication can get you around the Earth. Literally. You can do that in many ways.
- VLF, LF: these band can go through the Earth and are used for reaching submarines. There is a radio amateur band available at 2200m
- HF: the workhorse long distance bands where you with some skill can transmit around the globe at 10 W
- VHF and up: there are many bands available with specific services:
- A: you can use the radio amateur packet radio system using store and forward and send data across the world
- B: you can use radio amateur satellites (see OSCAR)
- C: you can use meteor scatter
- D: with care you can use moon bounce or EME to reflect signal back to Earth
- (B, C and D will give intercontinental range but not necessarily full globe coverage)
- --[License]-----
- Get a license. Seriously. There are many good reasons for this
- To get a license you have to learn a few important things:
- - electronics: this is important for many reasons such as making sure you don't kill yourself or jam emergency bands with harmonics
- - protocol: this is important to make sure you can coexist on the band with others
- - band knowledge: this lets you know what frequencies will work well under what circumstances, and there are many bands, many with important limitations
- - tricks: if you really, really, really need to transmit without being found there are a lot of things to know.
- With a license you get a call sign. Without a valid call sign you will stick out like a sore thumb. Just think of teenage script kiddies who have just downloaded LOIC and is boasting on a computer security forum.
- --[Monitoring]
- There is a lot of cold war rules to this activity and all bands are monitored and emitters located as a matter of routine with ground and space based SIGINT systems. Even accidental transmissions into military emergency bands will bring about reactions.
- Below 30 MHz you will be caught by systems like the Wullenwebers, huge antenna systems that at 300 m diameter have earned the nickname "Elephant cages".
- Above 30 MHz you will be caught by satellite systems like Mercury, Vortex and more.
- --[Equipment]-----
- You can get cheap transceivers operating on a single band, morse only, for about 50 dollars. For a few hundred dollars more you can get Elecraft transceivers, some of which are very portable.
- At VHF and UHF you can get cheap Baofeng radios.
- If you want to try a receive only you need no license. A cheap SDR like RTL-SDR is good bang for the bucks and gives you huge coverage.
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