This has been asked before. Maybe a different distance but similar. I seen to remember that the best answer we came up with was that it was better to just go out an buy a pair. Even the cheapest pair should have that range unless inside a building with metal walls. There is no easy way to build a set and you would spend much more than new ones cost. In the USA it is illegal to build a transmitter unless you have a license except for very very low powered ones under Chapter 15, and some other experimental allowances. These typically have 200 foot range or less.
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. I have to disagree with Re-design's "There is no easy way to build a set" comment. I built a set of Heathkit walkie-talkies when I was a pre-teen. . But, as he also points out, buying a kit (or the components) would probably be more expensive than buying a half-decent set. The cheapies probably won't give you more than 100m range. Look in a hunting catalog for "long-range" units.
Heathkit has been out of business for about 15 years now. I don't know of anyone that has taken up the slack. I wish someone would put together some of the same things heathkit did. Ramsey still does quite a bit of kit stuff.
Half a K is a bit of a long way, if you really want to make one I can Google it for you, but otherwise Re-design has your answer. L
Oh... When I saw this, I was thinking 500 miles... Now I see that it's actually 500 meters. Silly me. And don't you start going off on me about saying "meters" and not "meteres" :P
I really hope they didn't mean miles...Metres (not "meters" or "meteres") L
Yes, but the wiki article says "The metre (or meter)". So HA!
As the silly US spelling which confuses it with meter. It's part of the Metric system not the Meteric system... L
Was meter meant to be a link?
Hmm, script-fail. Meter as many meanings, non of which are a metric measure unless you are American. L
I am a little bad at spellings.