problem with sending data using RF module

[rano_zen06]

Shouldn't be that critical for few millivolts. Are your Encoder/decoders address pins tied to ground as in the document i sent?

Yes.All the Address pin for both encoder/decoder was tied low. I also connect the TE pin to GND for HT12E,but still no data receive at Rx. I'm not assuming that both encoder/decoder is damage because I have extra pair for HT12E and HT12D. when I use it, the result is same with the previous pair I have.the Holtek's data sheet say that the VT pin at HT12D will goes high to indicate valid transmission but my VT pin always LOW.