RF Transmitter Receiver

Replies

• 

  Harshad Italiya

  If you have a doubt on encoder and decoder section then first try to send and receive data without using Encoder and Decoder Chip. It should work properly.
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  jasonchong0

  Thanks for the quick reply.
  
  I tried removing the encoder decoder section and connect VDD to the Data In of the T5-434. However, I did not manage to get a 5V at the Data Out of the R5-434 when measured with a multi-meter.
  
  I would think that the encoder decoder part should not be the problem in this case. But I may be wrong.
• 

  Harshad Italiya

  Have you applied VDD directly to Data In of T5-434? as they have mentioned that you have to use some CMOS driver circuitry to match the impedance of 45 Ohm.
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  jasonchong0

  The HT12E and HT12D would help because they have CMOS compatible outputs.
• 

  Harshad Italiya

  jasonchong0

  The HT12E and HT12D would help because they have CMOS compatible outputs.

  Have you checked there is one small circuit also don't why it is used but i think most probably for impedance matching.
• 

  jasonchong0

  Correct me if I'm wrong but do you mean the carrier detect circuit? That would be to indicate if any signal is being transmitted.
• 

  Harshad Italiya

  Actuually they have written that there is one pin which gives the strength of the FM Signal. So we have to check first that our Transmitter is transmitting or not? and by checking strength at that pin we can decide some conclusion what you say?
• 

  jasonchong0

  I have tried that without adding the additional circuit, the voltage at the RSSI pin records a reading of approximately 0.5V. This is less than any of the values they gave in the RSSI table. I will try to construct the Carrier Detect additional circuit soon to try out.
  
  But in the mean time, would there be any other possible problems?
• 

  Harshad Italiya

  jasonchong0

  I have tried that without adding the additional circuit, the voltage at the RSSI pin records a reading of approximately 0.5V. This is less than any of the values they gave in the RSSI table. I will try to construct the Carrier Detect additional circuit soon to try out.
  
  But in the mean time, would there be any other possible problems?

  I think there no other component so it have to work properly don't know if there is any other problem. 😔
• 

  jasonchong0

  Alright thank you anyway! 😀