How to make a DIY relatively long distance radio signal emitter/tracker? Answered
This is a bit of a two-parter.
The first part is that I would like to make a DIY radio emitter that could transmit to a distance of 1km. I'm not sure about the laws in South Africa, but it should be legal if within the ranges prescribed by the law.
The second part is that I would like to create several devices that could track the nearest radio signal on a specific band or band range (as I would expect that I would have to use a filter for both the transmission and receiving). I think that direction of the source of the signal would be sufficient.
The reason for this is that I have had a few instances over the years where people got lost while camping and had to sleep in the wilds because it was too dark to find their way back to camp.
Any advice, thoughts, links would be much appreciated.
Also, if you have any other ideas that will cost about the same or less, that would be awesome to try out, too :)