Dorji RF Receiver Problem

[Taban]

Hil all, i have a problem with Dorji Rf Receiver. My transmitter sends data in 53 second period but i cant receive them. I am taking rubbish signals. When i connect data pin to scope. I am seeing a screen like that



In addition. I cant see any data at logic analyzer.

What i should do ?

It is my RF receiver module



Thanks for help

 

[SpaceDust]

Kindly check the cable and pin connections..!! and that no signal wire is touching ground conductor or likewise..!!

 

[Taban]

I checked my connections, there is no problem at connections, that antenna wire is not touching ground conductor.

 

[Venkadesh_M]

where you give vcc and gnd to receiver???

 

[Taban]

I didnt put picture of breadboard circuit to here , but my receivers pins are like below and my connections are correct.

**broken link removed**

 

[Venkadesh_M]

It says invalid picture

 

[Taban]

It says invalid picture

No they are valid, i can open pictures.

 

[davenn]

No they are valid, i can open pictures.

cuz its in your puter cache

I cannot open the pic either. Try again

Dave

- - - Updated - - -

Plus as I told you in the other forum

Show us photos of YOUR construction so we can check it for errors

a lone antenna wire twisted around the antenna pin, without any other power or I/O connections will not make the unit work



Dave

 

[Taban]

It is my construction. Yellow cables go to ground, green one goes to 5V, and orange cable is data cable. I connect it to PIC or Scope . All of them directly connected. There is no extra thing. That capacitor(47 uF), i soldered it as external to prevent AGC by looking IC's(SYN470R) datasheet which inside my receiver module.

 

[E-design]

Do you have a link to the datasheet?

 

[Taban]

Sorry, it is here **broken link removed**

 

[Venkadesh_M]

Why there is a soldered Capacitor??? which is not in the datasheet....

 

[Taban]

Which datasheet do you mean ? dorji or syn470r ? in dorji's datasheet there isnt but in SYN470R's datasheet there is a schema at page 20 that shows a external capacitor added between CAGC and SHUT pins.

 

[biff44]

assuming the chip is working and the board is correctly laid out, either:
1) your transmitter is too close
2) your transmitter is too far away
3) the AGC R-C timing network has the wrong values for the data rate u are sending
4) there is a strong interfering signal nearby

 

[Taban]

Thanks for reply i will insist on AGC R-C timing network. Otherwise i will doubt about there is a strong interference.

 

[kspalla]

max value is 4.7uF not 47uH that makes time constant increase by 10 times. typical is 0.47uF. try it.
pls check **broken link removed**
Regards.