Dear All,

My name is Chet Chetchaiyan, leaving in Thailand. At this moment, I'm facing a problem of RF 433.92MHz communication.

Here is the background of my module.

Transmission
- using TWS-BS-3 from wenshing for Transter module please see datasheet on Reference1.
- data sended by AVR microcontroller as serial communication (Tx) directly to TWS-BS-3
- 5V power supply apply for all devices.
- I use ~15cm. 24AWG wire as antenna

Receiver
- using RWS-374-6 from wenshing for Receiver module please see datasheet on Reference2.
- data received by AVR microcontroller as serial communication (Tx) directly from RWS-374-6
- 5V power supply apply for all devices.
- I use ~20cm. 24AWG wire as antenna.

Reference
1. http://www.es.co.th/Schemetic/PDF/TWS-BS3
2. http://www.es.co.th/Schemetic/PDF/RWS-374-6.PDF


Here is the Result
The result of my module isn't meet my requirement. the module can trasmit only a shot range and result vary with out any reason. The example is at morning it can receive data with 5m. range with concrete wall in the middle, but sometimes the range reduce to 2m. without any obstrucle. and later on it can work well again.

Anyone have experience on RF communication please give me suggestion and/or answer my question for complete this module

Question
1. How could I improve communication range and make it more stable. My target range is 10m with concrete wall in the middle.
2. Can I use HT12E and HT12D for encode/decode the message?
- Is it increase communication range?

Thank you for everyone who visit and share your time with my problem

Best Regards,
Chet Chetchaiyan

 

Try some of these modules from this company>> http://www.linxtechnologies.com, you can find their products at Digi-Key, and don't forget to use the 1/4 whip antennas to get the best range, no need for encoders or decoders if you are transmitting serial data....