wireless recv idle problem

[young]

I have two set up no wireless communication, one setup is clear that when there is no data, receivere side is idle as high, which I success in data collection. another when it is in idle it is some kind of square wave, I did not know where these square come from, and I think in idle state it should either high or low there should not be waves. please advice what might casue this problem.

sincerely

[Humberto]

Hola joung,

Using a small non-magnetic screwdriver re-tune the variable
tunning capacitor in the Rx module front end while watching the
output with a scope.

Humberto

[Guest]

I tried to switch the one which have the ideal idle (high) with this one that has square wave idle, but the same thing happened. I will try to tunning the RX modual as you suggested.

thank you

[Guest]

I was tunning my program and I am able to get data at the very beginning, however, after a while the data changes to something weired, please help with possible reasons