I am trying to design a small low power RF transmitter using a saw resonator.
My circuit is somewhat similar to the circuit given in the link except for the R3 resistor.
The saw resonator I am using is 433 Mhz and the frequency of the tuned circuit I calculated comes out to be 443Mhz. Does this makes a Difference.
The RF transistor I am using is BFS17A and the values of the components areas below.
C1=5pF , C2=18pF ,L1=33nH, R1=47K, R2=100 and RF bypass cap =470 pf.

But the circuit is working only for a small distance say 1 meter. I want to make it work at around 10 -20m.
I am using a general purpose PCB for the same with DIP components.
Are there any solutions to this.
I am using a pair of Encoder and decoder. Please provide some solutions .

 

You forgot the link to the circuit.
What is your antenna for transmitting, for receiving?

 

The circuit is given in the image I have inserted and the inductor is acting as my antenna.

 

The circuit is given in the image I have inserted and the inductor is acting as my antenna.

I cannot see any image?

 

couple to an antenna, your range will be better than just an unshielded inductor.

 

couple to an antenna, the range will be better.

 

Can you post a link to your image? I can't see it either.

 

Hello,

I also see no image.

Looking at the page source, he is referring to this page:
http://electronics.stackexchange.com/questions/116868/saw-resonator-based-low-power-rf-transmitter

Bertus

 

at 433 mhz, coils are so small they make real bad antennas. add an antenna.

 

Thanks, bertus. He must mean this image, you say?

 

Yeah I mean the same image as shown by Bertus. But what about the resonant frequency of my tuned circuit, it should be close to 433Mhz whereas it is 443Mhz.Does this makes a difference. Can anyone please suggest some circuit with components values.