RF transmitter & Receiver

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shrikanthkp

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Sir
I want to use 3no 433MHz RF Tx & Rx. separately
But the problem If i connect to 9 Volt supply to the all 3 Tx then the receivers will not receive its signals.If i disconnect supply for 2 Tx then its particular receiver receives the signal. Pl. help me
Thanking You
shrikanth
 

Tune each Tx/Rx pair on separate channel.
 

Thats because you have 3 Tx all transmitting on the exact same frequency, and creating interference with each other. Then each Rx will see overlapped signals from all three Tx & it'll output garbage. What did you expect to happen ?

You have to shift the frequencies of each tx/Rx pair so that it is different from all others, (Freq Div Multiplex or FDM)
OR
Switch on only one Tx/ Rx pair at a time. (Time Div Multiples or TDM). I don't see an easy way to do this in a distributed system without quite complicated protocol implementations. You could try implementing some simply form of CSMA/CD ?
 
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