I am using a 315Mhz Transmitter and Receiver RF link kit between two arduino. What happens if I wire the antennas of both RX and TX to both ends of a 1 meter long metal wire? Will using a conductor instead of air channel affect the communication positively or negatively if it affects at all? What if its a 1m shielded wire? Will that help in noise reduction?
There is a lot to explain here, the question seems ill thought out, but I will try, and perhaps we can elaborate as you give more information.
If you are trying to design a transceiver where Rx and Tx share an antenna, then the approach you have outlined is not valid. You either need:
- Half duplex operation, using an Rx/Tx antenna switch and a proper antenna e.g. monopole.
- Full duplex operation, using a duplexer/diplexer with Rx and Tx using different frequencies and again, a proper antenna.
However, it is possible that you are talking about making a test rig where the "air channel" is replaced by a cable. If that is the case, then:
- You can connect the two using a coaxial cable.
- You must have a large antenuator to simulate the channel and protect the receiver.
- The attenuator value will depend on the Tx power and Rx max input rating listed in the "absolute maximum" section of the datasheet.
- A good starting point to avoid trouble is 50 or 60dB.