This is not a question about specific circuit details; rather it is more like about the idea. I need to transmit some information (might be a name or an address or simply a number) over radio. The intended range is about 500 meters to 1000 meters.
1. Is it better to use AM or FM?
2. Does a transmitter of this kind need to have an (external) antenna for this range?
3. What is the range at which an antenna is not needed?
4. If the signal is to carry information stored in a chip (e.g. EPROM), can you tell me how it will be added to the radio signal? (For instance, if the information is a number composed of 6 digits) and how will the receiver get the information from the signal?
It is common knowledge that radio carries an audio signal, but it this case it is information stored on a chip...
I appreciate your help.
1. Is it better to use AM or FM?
2. Does a transmitter of this kind need to have an (external) antenna for this range?
3. What is the range at which an antenna is not needed?
4. If the signal is to carry information stored in a chip (e.g. EPROM), can you tell me how it will be added to the radio signal? (For instance, if the information is a number composed of 6 digits) and how will the receiver get the information from the signal?
It is common knowledge that radio carries an audio signal, but it this case it is information stored on a chip...
I appreciate your help.